Simplify schema builders and add missing field builders.

backend/extensions/Squidex.Extensions/Samples/Middleware/TemplateInstance.cs

@@ -6,6 +6,7 @@
 // ==========================================================================
 
 using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Apps.Templates;
 using Squidex.Domain.Apps.Entities.Apps.Templates.Builders;
 
@@ -20,16 +21,26 @@ namespace Squidex.Extensions.Samples.Middleware
             var schema =
                 SchemaBuilder.Create("Blogs")
                     .AddString("Title", f => f
-                        .Length(100)
+                        .Properties(p => p with
+                        {
+                            MaxLength = 100
+                        })
                         .Required())
                     .AddString("Slug", f => f
-                        .Length(100)
+                        .Properties(p => p with
+                        {
+                            MaxLength = 100
+                        })
                         .Required()
                         .Disabled())
                     .AddString("Text", f => f
-                        .Length(1000)
-                        .Required()
-                        .AsRichText())
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.RichText,
+                            MaxLength = 1000,
+                            MinLength = 200
+                        })
+                        .Required())
                     .Build();
 
             return publish(schema);

backend/extensions/Squidex.Extensions/Samples/Middleware/TemplateMiddleware.cs

@@ -7,6 +7,7 @@
 
 using System;
 using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities;
 using Squidex.Domain.Apps.Entities.Apps.Commands;
 using Squidex.Domain.Apps.Entities.Apps.Templates.Builders;
@@ -35,16 +36,26 @@ namespace Squidex.Extensions.Samples.Middleware
                 var schema =
                     SchemaBuilder.Create("Pages")
                         .AddString("Title", f => f
-                            .Length(100)
+                            .Properties(p => p with
+                            {
+                                MaxLength = 100
+                            })
                             .Required())
                         .AddString("Slug", f => f
-                            .Length(100)
+                            .Properties(p => p with
+                            {
+                                MaxLength = 100
+                            })
                             .Required()
                             .Disabled())
                         .AddString("Text", f => f
-                            .Length(1000)
-                            .Required()
-                            .AsRichText())
+                            .Properties(p => p with
+                            {
+                                Editor = StringFieldEditor.RichText,
+                                MaxLength = 1000,
+                                MinLength = 200
+                            })
+                            .Required())
                         .Build();
 
                 await publish(schema);

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ArrayFieldBuilder.cs

@@ -13,96 +13,134 @@ using Squidex.Text;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class ArrayFieldBuilder : FieldBuilder<ArrayFieldBuilder>
+    public sealed class ArrayFieldBuilder : FieldBuilder<ArrayFieldBuilder, ArrayFieldProperties>
     {
         private UpsertSchemaField TypedField
         {
             get => (UpsertSchemaField)Field;
         }
 
-        public ArrayFieldBuilder(UpsertSchemaField field, CreateSchema schema)
-            : base(field, schema)
+        public ArrayFieldBuilder(UpsertSchemaField field, ArrayFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
 
         public ArrayFieldBuilder AddAssets(string name, Action<AssetFieldBuilder> configure)
         {
-            var field = AddField<AssetsFieldProperties>(name);
+            var (field, properties) = AddField<AssetsFieldProperties>(name);
 
-            configure(new AssetFieldBuilder(field, Schema));
+            configure(new AssetFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddBoolean(string name, Action<BooleanFieldBuilder> configure)
         {
-            var field = AddField<BooleanFieldProperties>(name);
+            var (field, properties) = AddField<BooleanFieldProperties>(name);
 
-            configure(new BooleanFieldBuilder(field, Schema));
+            configure(new BooleanFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddDateTime(string name, Action<DateTimeFieldBuilder> configure)
         {
-            var field = AddField<DateTimeFieldProperties>(name);
+            var (field, properties) = AddField<DateTimeFieldProperties>(name);
 
-            configure(new DateTimeFieldBuilder(field, Schema));
+            configure(new DateTimeFieldBuilder(field, properties, Schema));
+
+            return this;
+        }
+
+        public ArrayFieldBuilder AddComponent(string name, Action<ComponentFieldBuilder> configure)
+        {
+            var (field, properties) = AddField<ComponentFieldProperties>(name);
+
+            configure(new ComponentFieldBuilder(field, properties, Schema));
+
+            return this;
+        }
+
+        public ArrayFieldBuilder AddComponents(string name, Action<ComponentsFieldBuilder> configure)
+        {
+            var (field, properties) = AddField<ComponentsFieldProperties>(name);
+
+            configure(new ComponentsFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddJson(string name, Action<JsonFieldBuilder> configure)
         {
-            var field = AddField<JsonFieldProperties>(name);
+            var (field, properties) = AddField<JsonFieldProperties>(name);
 
-            configure(new JsonFieldBuilder(field, Schema));
+            configure(new JsonFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddNumber(string name, Action<NumberFieldBuilder> configure)
         {
-            var field = AddField<NumberFieldProperties>(name);
+            var (field, properties) = AddField<NumberFieldProperties>(name);
 
-            configure(new NumberFieldBuilder(field, Schema));
+            configure(new NumberFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddReferences(string name, Action<ReferencesFieldBuilder> configure)
         {
-            var field = AddField<ReferencesFieldProperties>(name);
+            var (field, properties) = AddField<ReferencesFieldProperties>(name);
 
-            configure(new ReferencesFieldBuilder(field, Schema));
+            configure(new ReferencesFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
         public ArrayFieldBuilder AddString(string name, Action<StringFieldBuilder> configure)
         {
-            var field = AddField<StringFieldProperties>(name);
+            var (field, properties) = AddField<StringFieldProperties>(name);
 
-            configure(new StringFieldBuilder(field, Schema));
+            configure(new StringFieldBuilder(field, properties, Schema));
 
             return this;
         }
 
-        private UpsertSchemaNestedField AddField<T>(string name) where T : FieldProperties, new()
+        public ArrayFieldBuilder AddTags(string name, Action<TagsFieldBuilder> configure)
         {
-            var nestedField = new UpsertSchemaNestedField
+            var (field, properties) = AddField<TagsFieldProperties>(name);
+
+            configure(new TagsFieldBuilder(field, properties, Schema));
+
+            return this;
+        }
+
+        public ArrayFieldBuilder AddUI(string name, Action<UIFieldBuilder> configure)
         {
-                Name = name.ToCamelCase(),
-                Properties = new T
+            var (field, properties) = AddField<UIFieldProperties>(name);
+
+            configure(new UIFieldBuilder(field, properties, Schema));
+
+            return this;
+        }
+
+        private (UpsertSchemaNestedField, T) AddField<T>(string name) where T : FieldProperties, new()
+        {
+            var properties = new T
             {
                 Label = name
-                }
+            };
+
+            var nestedField = new UpsertSchemaNestedField
+            {
+                Name = name.ToCamelCase(),
+                Properties = properties
             };
 
             TypedField.Nested ??= Array.Empty<UpsertSchemaNestedField>();
             TypedField.Nested = TypedField.Nested.Union(new[] { nestedField }).ToArray();
 
-            return nestedField;
+            return (nestedField, properties);
         }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/AssetFieldBuilder.cs

@@ -5,47 +5,16 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using Squidex.Domain.Apps.Core.Assets;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class AssetFieldBuilder : FieldBuilder<AssetFieldBuilder>
+    public sealed class AssetFieldBuilder : FieldBuilder<AssetFieldBuilder, AssetsFieldProperties>
     {
-        public AssetFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public AssetFieldBuilder(UpsertSchemaFieldBase field, AssetsFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public AssetFieldBuilder MustBeImage()
-        {
-            Properties<AssetsFieldProperties>(p => p with
-            {
-                ExpectedType = AssetType.Image
-            });
-
-            return this;
-        }
-
-        public AssetFieldBuilder MustBe(AssetType type)
-        {
-            Properties<AssetsFieldProperties>(p => p with
-            {
-                ExpectedType = type
-            });
-
-            return this;
-        }
-
-        public AssetFieldBuilder RequireSingle()
-        {
-            Properties<AssetsFieldProperties>(p => p with
-            {
-                MaxItems = 1
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/BooleanFieldBuilder.cs

@@ -10,22 +10,11 @@ using Squidex.Domain.Apps.Entities.Schemas.Commands;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class BooleanFieldBuilder : FieldBuilder<BooleanFieldBuilder>
+    public sealed class BooleanFieldBuilder : FieldBuilder<BooleanFieldBuilder, BooleanFieldProperties>
     {
-        public BooleanFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public BooleanFieldBuilder(UpsertSchemaFieldBase field, BooleanFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public BooleanFieldBuilder AsToggle()
-        {
-            Properties<BooleanFieldProperties>(p => p with
-            {
-                Editor = BooleanFieldEditor.Toggle,
-                EditorUrl = null
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ComponentFieldBuilder.cs

@@ -0,0 +1,20 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Domain.Apps.Entities.Schemas.Commands;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
+{
+    public sealed class ComponentFieldBuilder : FieldBuilder<ComponentFieldBuilder, ComponentFieldProperties>
+    {
+        public ComponentFieldBuilder(UpsertSchemaFieldBase field, ComponentFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
+        {
+        }
+    }
+}

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ComponentsFieldBuilder.cs

@@ -0,0 +1,20 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Domain.Apps.Entities.Schemas.Commands;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
+{
+    public sealed class ComponentsFieldBuilder : FieldBuilder<ComponentsFieldBuilder, ComponentsFieldProperties>
+    {
+        public ComponentsFieldBuilder(UpsertSchemaFieldBase field, ComponentsFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
+        {
+        }
+    }
+}

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/DateTimeFieldBuilder.cs

@@ -10,22 +10,11 @@ using Squidex.Domain.Apps.Entities.Schemas.Commands;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class DateTimeFieldBuilder : FieldBuilder<DateTimeFieldBuilder>
+    public sealed class DateTimeFieldBuilder : FieldBuilder<DateTimeFieldBuilder, DateTimeFieldProperties>
     {
-        public DateTimeFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public DateTimeFieldBuilder(UpsertSchemaFieldBase field, DateTimeFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public DateTimeFieldBuilder AsDateTime()
-        {
-            Properties<DateTimeFieldProperties>(p => p with
-            {
-                Editor = DateTimeFieldEditor.DateTime,
-                EditorUrl = null
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/FieldBuilder.cs

@@ -15,59 +15,68 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
     public abstract class FieldBuilder
     {
         protected UpsertSchemaFieldBase Field { get; init; }
+
         protected CreateSchema Schema { get; init; }
     }
 
-    public abstract class FieldBuilder<T> : FieldBuilder
-        where T : FieldBuilder
+    public abstract class FieldBuilder<T, TProperties> : FieldBuilder where T : FieldBuilder where TProperties : FieldProperties
     {
-        protected FieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
+        private TProperties properties;
+
+        protected FieldBuilder(UpsertSchemaFieldBase field, TProperties properties, CreateSchema schema)
         {
+            this.properties = properties;
+
             Field = field;
             Schema = schema;
         }
 
-        public T Label(string? label)
+        public T Localizable()
+        {
+            if (Field is UpsertSchemaField localizableField)
             {
-            Field.Properties = Field.Properties with { Label = label };
+                localizableField.Partitioning = Partitioning.Language.Key;
+            }
 
             return (T)(object)this;
         }
 
-        public T Hints(string? hints)
+        public T Disabled(bool isDisabled = true)
         {
-            Field.Properties = Field.Properties with { Hints = hints };
+            Field.IsDisabled = isDisabled;
 
             return (T)(object)this;
         }
 
-        public T Localizable()
-        {
-            if (Field is UpsertSchemaField localizableField)
+        public T Hidden(bool isHidden = true)
         {
-                localizableField.Partitioning = Partitioning.Language.Key;
-            }
+            Field.IsHidden = isHidden;
 
             return (T)(object)this;
         }
 
-        public T Disabled()
+        public T Label(string? label)
         {
-            Field.IsDisabled = true;
-
-            return (T)(object)this;
+            return Properties(x => x with { Label = label });
         }
 
-        public T Required()
+        public T Hints(string? hints)
         {
-            Field.Properties = Field.Properties with { IsRequired = true };
+            return Properties(x => x with { Hints = hints });
+        }
 
-            return (T)(object)this;
+        public T Required(bool isRequired = true)
+        {
+            return Properties(x => x with { IsRequired = isRequired });
         }
 
-        protected void Properties<TProperties>(Func<TProperties, TProperties> updater) where TProperties : FieldProperties
+        public T Properties(Func<TProperties, TProperties> updater)
         {
-            Field.Properties = updater((TProperties)Field.Properties);
+            properties = updater(properties);
+
+            Field.Properties = properties;
+
+            return (T)(object)this;
         }
 
         public T ShowInList()

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/JsonFieldBuilder.cs

@@ -5,14 +5,15 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class JsonFieldBuilder : FieldBuilder<JsonFieldBuilder>
+    public sealed class JsonFieldBuilder : FieldBuilder<JsonFieldBuilder, JsonFieldProperties>
     {
-        public JsonFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public JsonFieldBuilder(UpsertSchemaFieldBase field, JsonFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
     }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/NumberFieldBuilder.cs

@@ -5,14 +5,15 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class NumberFieldBuilder : FieldBuilder<NumberFieldBuilder>
+    public sealed class NumberFieldBuilder : FieldBuilder<NumberFieldBuilder, NumberFieldProperties>
     {
-        public NumberFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public NumberFieldBuilder(UpsertSchemaFieldBase field, NumberFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
     }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/ReferencesFieldBuilder.cs

@@ -7,26 +7,14 @@
 
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Collections;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class ReferencesFieldBuilder : FieldBuilder<ReferencesFieldBuilder>
+    public sealed class ReferencesFieldBuilder : FieldBuilder<ReferencesFieldBuilder, ReferencesFieldProperties>
     {
-        public ReferencesFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public ReferencesFieldBuilder(UpsertSchemaFieldBase field, ReferencesFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public ReferencesFieldBuilder WithSchemaId(DomainId id)
-        {
-            Properties<ReferencesFieldProperties>(p => p with
-            {
-                SchemaIds = ImmutableList.Create(id)
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/SchemaBuilder.cs

@@ -67,96 +67,122 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
             return this;
         }
 
+        public SchemaBuilder AddArray(string name, Action<ArrayFieldBuilder> configure)
+        {
+            var (field, properties) = AddField<ArrayFieldProperties>(name);
+
+            configure(new ArrayFieldBuilder(field, properties, command));
+
+            return this;
+        }
+
         public SchemaBuilder AddAssets(string name, Action<AssetFieldBuilder> configure)
         {
-            var field = AddField<AssetsFieldProperties>(name);
+            var (field, properties) = AddField<AssetsFieldProperties>(name);
 
-            configure(new AssetFieldBuilder(field, command));
+            configure(new AssetFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddBoolean(string name, Action<BooleanFieldBuilder> configure)
         {
-            var field = AddField<BooleanFieldProperties>(name);
+            var (field, properties) = AddField<BooleanFieldProperties>(name);
 
-            configure(new BooleanFieldBuilder(field, command));
+            configure(new BooleanFieldBuilder(field, properties, command));
+
+            return this;
+        }
+
+        public SchemaBuilder AddComponent(string name, Action<ComponentFieldBuilder> configure)
+        {
+            var (field, properties) = AddField<ComponentFieldProperties>(name);
+
+            configure(new ComponentFieldBuilder(field, properties, command));
+
+            return this;
+        }
+
+        public SchemaBuilder AddComponents(string name, Action<ComponentsFieldBuilder> configure)
+        {
+            var (field, properties) = AddField<ComponentsFieldProperties>(name);
+
+            configure(new ComponentsFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddDateTime(string name, Action<DateTimeFieldBuilder> configure)
         {
-            var field = AddField<DateTimeFieldProperties>(name);
+            var (field, properties) = AddField<DateTimeFieldProperties>(name);
 
-            configure(new DateTimeFieldBuilder(field, command));
+            configure(new DateTimeFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddJson(string name, Action<JsonFieldBuilder> configure)
         {
-            var field = AddField<JsonFieldProperties>(name);
+            var (field, properties) = AddField<JsonFieldProperties>(name);
 
-            configure(new JsonFieldBuilder(field, command));
+            configure(new JsonFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddNumber(string name, Action<NumberFieldBuilder> configure)
         {
-            var field = AddField<NumberFieldProperties>(name);
+            var (field, properties) = AddField<NumberFieldProperties>(name);
 
-            configure(new NumberFieldBuilder(field, command));
+            configure(new NumberFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddReferences(string name, Action<ReferencesFieldBuilder> configure)
         {
-            var field = AddField<ReferencesFieldProperties>(name);
+            var (field, properties) = AddField<ReferencesFieldProperties>(name);
 
-            configure(new ReferencesFieldBuilder(field, command));
+            configure(new ReferencesFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddString(string name, Action<StringFieldBuilder> configure)
         {
-            var field = AddField<StringFieldProperties>(name);
+            var (field, properties) = AddField<StringFieldProperties>(name);
 
-            configure(new StringFieldBuilder(field, command));
+            configure(new StringFieldBuilder(field, properties, command));
 
             return this;
         }
 
         public SchemaBuilder AddTags(string name, Action<TagsFieldBuilder> configure)
         {
-            var field = AddField<TagsFieldProperties>(name);
+            var (field, properties) = AddField<TagsFieldProperties>(name);
 
-            configure(new TagsFieldBuilder(field, command));
+            configure(new TagsFieldBuilder(field, properties, command));
 
             return this;
         }
 
-        public SchemaBuilder AddArray(string name, Action<ArrayFieldBuilder> configure)
+        public SchemaBuilder AddUI(string name, Action<UIFieldBuilder> configure)
         {
-            var field = AddField<ArrayFieldProperties>(name);
+            var (field, properties) = AddField<UIFieldProperties>(name);
 
-            configure(new ArrayFieldBuilder(field, command));
+            configure(new UIFieldBuilder(field, properties, command));
 
             return this;
         }
 
-        private UpsertSchemaField AddField<T>(string name) where T : FieldProperties, new()
+        private (UpsertSchemaField, T) AddField<T>(string name) where T : FieldProperties, new()
         {
+            var properties = new T { Label = name };
+
             var field = new UpsertSchemaField
             {
                 Name = name.ToCamelCase(),
-                Properties = new T
-                {
-                    Label = name
-                }
+                Properties = properties,
             };
 
             if (command.Fields == null)
@@ -168,7 +194,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
                 command.Fields = command.Fields.Union(Enumerable.Repeat(field, 1)).ToArray();
             }
 
-            return field;
+            return (field, properties);
         }
 
         public CreateSchema Build()

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/StringFieldBuilder.cs

@@ -7,81 +7,14 @@
 
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
-using Squidex.Infrastructure.Collections;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class StringFieldBuilder : FieldBuilder<StringFieldBuilder>
+    public sealed class StringFieldBuilder : FieldBuilder<StringFieldBuilder, StringFieldProperties>
     {
-        public StringFieldBuilder(UpsertSchemaFieldBase field, CreateSchema schema)
-            : base(field, schema)
+        public StringFieldBuilder(UpsertSchemaFieldBase field, StringFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public StringFieldBuilder AsTextArea()
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                EditorUrl = null,
-                Editor = StringFieldEditor.TextArea
-            });
-
-            return this;
-        }
-
-        public StringFieldBuilder AsRichText()
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                EditorUrl = null,
-                Editor = StringFieldEditor.RichText
-            });
-
-            return this;
-        }
-
-        public StringFieldBuilder AsDropDown(params string[] values)
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                AllowedValues = ImmutableList.Create(values),
-                EditorUrl = null,
-                Editor = StringFieldEditor.Dropdown
-            });
-
-            return this;
-        }
-
-        public StringFieldBuilder Unique()
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                IsUnique = true
-            });
-
-            return this;
-        }
-
-        public StringFieldBuilder Pattern(string pattern, string? message = null)
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                Pattern = pattern,
-                PatternMessage = message
-            });
-
-            return this;
-        }
-
-        public StringFieldBuilder Length(int maxLength, int minLength = 0)
-        {
-            Properties<StringFieldProperties>(p => p with
-            {
-                MaxLength = maxLength,
-                MinLength = minLength
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/TagsFieldBuilder.cs

@@ -7,25 +7,14 @@
 
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas.Commands;
-using Squidex.Infrastructure.Collections;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
 {
-    public class TagsFieldBuilder : FieldBuilder<TagsFieldBuilder>
+    public sealed class TagsFieldBuilder : FieldBuilder<TagsFieldBuilder, TagsFieldProperties>
     {
-        public TagsFieldBuilder(UpsertSchemaField field, CreateSchema schema)
-            : base(field, schema)
+        public TagsFieldBuilder(UpsertSchemaFieldBase field, TagsFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
         {
         }
-
-        public TagsFieldBuilder WithAllowedValues(params string[] values)
-        {
-            Properties<TagsFieldProperties>(p => p with
-            {
-                AllowedValues = ImmutableList.Create(values)
-            });
-
-            return this;
-        }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/Builders/UIFieldBuilder.cs

@@ -0,0 +1,20 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Domain.Apps.Entities.Schemas.Commands;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Templates.Builders
+{
+    public sealed class UIFieldBuilder : FieldBuilder<UIFieldBuilder, UIFieldProperties>
+    {
+        public UIFieldBuilder(UpsertSchemaFieldBase field, UIFieldProperties properties, CreateSchema schema)
+            : base(field, properties, schema)
+        {
+        }
+    }
+}

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/CreateBlog.cs

@@ -7,6 +7,7 @@
 
 using System.Threading.Tasks;
 using Squidex.Domain.Apps.Core.Contents;
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Apps.Templates.Builders;
 using Squidex.Domain.Apps.Entities.Contents.Commands;
 using Squidex.Infrastructure;
@@ -67,12 +68,18 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
             var schema =
                 SchemaBuilder.Create("Posts")
                     .AddString("Title", f => f
-                        .Length(100)
+                        .Properties(p => p with
+                        {
+                            MaxLength = 100
+                        })
                         .Required()
                         .ShowInList()
                         .Hints("The title of the post."))
                     .AddString("Text", f => f
-                        .AsRichText()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.RichText
+                        })
                         .Required()
                         .Hints("The text of the post."))
                     .AddString("Slug", f => f
@@ -92,12 +99,18 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
             var schema =
                 SchemaBuilder.Create("Pages")
                     .AddString("Title", f => f
-                        .Length(100)
+                        .Properties(p => p with
+                        {
+                            MaxLength = 100
+                        })
                         .Required()
                         .ShowInList()
                         .Hints("The title of the page."))
                     .AddString("Text", f => f
-                        .AsRichText()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.RichText
+                        })
                         .Required()
                         .Hints("The text of the page."))
                     .AddString("Slug", f => f

backend/src/Squidex.Domain.Apps.Entities/Apps/Templates/CreateProfile.cs

@@ -6,10 +6,13 @@
 // ==========================================================================
 
 using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Assets;
 using Squidex.Domain.Apps.Core.Contents;
+using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Apps.Templates.Builders;
 using Squidex.Domain.Apps.Entities.Contents.Commands;
 using Squidex.Infrastructure;
+using Squidex.Infrastructure.Collections;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Templates
 {
@@ -64,17 +67,31 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("Your last name."))
                     .AddAssets("Image", f => f
-                        .MustBeImage()
+                        .Properties(p => p with
+                        {
+                            ExpectedType = AssetType.Image,
+                            MaxItems = 1,
+                            MinItems = 1
+                        })
                         .Hints("Your profile image."))
                     .AddString("Profession", f => f
-                        .AsTextArea()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.TextArea
+                        })
                         .Required()
                         .Hints("Describe your profession."))
                     .AddString("Summary", f => f
-                        .AsTextArea()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.TextArea
+                        })
                         .Hints("Write a short summary about yourself."))
                     .AddString("Legal Terms", f => f
-                        .AsTextArea()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.TextArea
+                        })
                         .Hints("The terms to fulfill legal requirements."))
                     .AddString("Github Link", f => f
                         .Hints("An optional link to your Github account."))
@@ -102,15 +119,23 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("The name of your project."))
                     .AddString("Description", f => f
-                        .AsTextArea()
+                        .Properties(p => p with
+                        {
+                            Editor = StringFieldEditor.TextArea
+                        })
                         .Required()
                         .Hints("Describe your project."))
                     .AddAssets("Image", f => f
-                        .MustBeImage()
+                        .Properties(p => p with
+                        {
+                            ExpectedType = AssetType.Image,
+                            MaxItems = 1,
+                            MinItems = 1
+                        })
                         .Required()
                         .Hints("An image or screenshot for your project."))
                     .AddString("Label", f => f
-                        .AsTextArea()
+                        .Properties(p => p with { Editor = StringFieldEditor.TextArea })
                         .Hints("An optional label to categorize your project, e.g. 'Open Source'."))
                     .AddString("Link", f => f
                         .Hints("An optional link to your project."))
@@ -136,7 +161,12 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("The company or organization you worked for."))
                     .AddAssets("Logo", f => f
-                        .MustBeImage()
+                        .Properties(p => p with
+                        {
+                            ExpectedType = AssetType.Image,
+                            MaxItems = 1,
+                            MinItems = 1
+                        })
                         .Hints("The logo of the company or organization you worked for."))
                     .AddDateTime("From", f => f
                         .Required()
@@ -163,7 +193,12 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("The school or university."))
                     .AddAssets("Logo", f => f
-                        .MustBeImage()
+                        .Properties(p => p with
+                        {
+                            ExpectedType = AssetType.Image,
+                            MaxItems = 1,
+                            MinItems = 1
+                        })
                         .Hints("The logo of the school or university."))
                     .AddDateTime("From", f => f
                         .Required()
@@ -186,7 +221,12 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("The name or title of your publication."))
                     .AddAssets("Cover", f => f
-                        .MustBeImage()
+                        .Properties(p => p with
+                        {
+                            ExpectedType = AssetType.Image,
+                            MaxItems = 1,
+                            MinItems = 1
+                        })
                         .Hints("The cover of your publication."))
                     .AddString("Description", f => f
                         .Hints("Describe the content of your publication."))
@@ -208,7 +248,15 @@ namespace Squidex.Domain.Apps.Entities.Apps.Templates
                         .ShowInList()
                         .Hints("The name of the skill."))
                     .AddString("Experience", f => f
-                        .AsDropDown("Beginner", "Advanced", "Professional", "Expert")
+                        .Properties(p => p with
+                        {
+                            AllowedValues = ImmutableList.Create(
+                                "Beginner",
+                                "Advanced",
+                                "Professional",
+                                "Expert"),
+                            Editor = StringFieldEditor.Dropdown,
+                        })
                         .Required()
                         .ShowInList()
                         .Hints("The level of experience."))

backend/src/Squidex.Domain.Apps.Entities/History/NotifoService.cs

@@ -24,6 +24,8 @@ using Squidex.Log;
 using Squidex.Shared.Identity;
 using Squidex.Shared.Users;
 
+#pragma warning disable MA0073 // Avoid comparison with bool constant
+
 namespace Squidex.Domain.Apps.Entities.History
 {
     public class NotifoService : IUserEvents
@@ -167,32 +169,16 @@ namespace Squidex.Domain.Apps.Entities.History
                 var maxAge = now - MaxAge;
 
                 var batches = events
-                    .Where(x => !x.AppEvent.Headers.Restored())
-                    .Where(x => IsNewer(x.AppEvent.Headers, maxAge))
-                    .Where(x => IsComment(x.AppEvent.Payload) || x.HistoryEvent != null)
+                    .Where(x => x.AppEvent.Headers.Restored() == false)
+                    .Where(x => x.AppEvent.Headers.Timestamp() > maxAge)
+                    .SelectMany(x => CreateRequests(x.AppEvent, x.HistoryEvent))
                     .Batch(50);
 
                 foreach (var batch in batches)
                 {
-                    var requests = new List<PublishDto>();
-
-                    foreach (var @event in batch)
-                    {
-                        var payload = @event.AppEvent.Payload;
-
-                        if (payload is CommentCreated comment && IsComment(payload))
-                        {
-                            AddMentions(requests, comment);
-                        }
-                        else if (@event.HistoryEvent != null)
-                        {
-                            AddHistoryEvent(requests, @event.HistoryEvent, payload);
-                        }
-                    }
-
                     var request = new PublishManyDto
                     {
-                        Requests = requests
+                        Requests = batch.ToList()
                     };
 
                     await client.Events.PostEventsAsync(options.AppId, request);
@@ -269,7 +255,22 @@ namespace Squidex.Domain.Apps.Entities.History
             }
         }
 
-        private void AddHistoryEvent(List<PublishDto> requests, HistoryEvent historyEvent, AppEvent payload)
+        private IEnumerable<PublishDto> CreateRequests(Envelope<AppEvent> appEvent, HistoryEvent? historyEvent)
+        {
+            if (appEvent.Payload is CommentCreated comment && comment.Mentions?.Length > 0)
+            {
+                foreach (var userId in comment.Mentions)
+                {
+                    yield return CreateMentionRequest(comment, userId);
+                }
+            }
+            else if (historyEvent != null)
+            {
+                yield return CreateHistoryRequest(historyEvent, appEvent.Payload);
+            }
+        }
+
+        private PublishDto CreateHistoryRequest(HistoryEvent historyEvent, AppEvent payload)
         {
             var publishRequest = new PublishDto
             {
@@ -295,12 +296,10 @@ namespace Squidex.Domain.Apps.Entities.History
             SetUser(payload, publishRequest);
             SetTopic(payload, publishRequest, historyEvent);
 
-            requests.Add(publishRequest);
+            return publishRequest;
         }
 
-        private static void AddMentions(List<PublishDto> requests, CommentCreated comment)
-        {
-            foreach (var userId in comment.Mentions!)
+        private static PublishDto CreateMentionRequest(CommentCreated comment, string userId)
         {
             var publishRequest = new PublishDto
             {
@@ -324,18 +323,7 @@ namespace Squidex.Domain.Apps.Entities.History
 
             SetUser(comment, publishRequest);
 
-                requests.Add(publishRequest);
-            }
-        }
-
-        private static bool IsNewer(EnvelopeHeaders headers, Instant maxAge)
-        {
-            return headers.Timestamp() > maxAge;
-        }
-
-        private static bool IsComment(AppEvent appEvent)
-        {
-            return appEvent is CommentCreated comment && comment.Mentions?.Length > 0;
+            return publishRequest;
         }
 
         private static void SetUser(AppEvent appEvent, PublishDto publishRequest)