Schemas made immutable.

src/Squidex.Domain.Apps.Core.Model/Schemas/Field{T}.cs

@@ -40,10 +40,10 @@ namespace Squidex.Domain.Apps.Core.Schemas
         {
             var typedProperties = ValidateProperties(newProperties);
 
-            return Clone<Field>(clone =>
+            return Clone<Field<T>>(clone =>
             {
-                properties = typedProperties;
+                clone.properties = typedProperties;
-                properties.Freeze();
+                clone.properties.Freeze();
             });
         }
 

src/Squidex.Domain.Apps.Core.Model/Schemas/Schema.cs

@@ -21,7 +21,7 @@ namespace Squidex.Domain.Apps.Core.Schemas
         private ImmutableList<Field> fieldsOrdered = ImmutableList<Field>.Empty;
         private ImmutableDictionary<long, Field> fieldsById = ImmutableDictionary<long, Field>.Empty;
         private ImmutableDictionary<string, Field> fieldsByName = ImmutableDictionary<string, Field>.Empty;
-        private SchemaProperties properties = new SchemaProperties();
+        private SchemaProperties properties;
         private bool isPublished;
 
         public string Name
@@ -54,30 +54,42 @@ namespace Squidex.Domain.Apps.Core.Schemas
             get { return properties; }
         }
 
-        public Schema(string name)
+        public Schema(string name, SchemaProperties properties = null)
         {
             Guard.NotNullOrEmpty(name, nameof(name));
 
             this.name = name;
+
+            this.properties = properties ?? new SchemaProperties();
+            this.properties.Freeze();
+
+            OnCloned();
         }
 
         public Schema(string name, IEnumerable<Field> fields, SchemaProperties properties, bool isPublished)
-            : this(name)
+            : this(name, properties)
         {
             Guard.NotNullOrEmpty(name, nameof(name));
 
             this.isPublished = isPublished;
 
-            this.properties = properties ?? new SchemaProperties();
-            this.properties.Freeze();
-
             fieldsOrdered = ImmutableList<Field>.Empty.AddRange(fields);
+
+            OnCloned();
         }
 
         protected override void OnCloned()
         {
-            fieldsById = fieldsOrdered.ToImmutableDictionary(x => x.Id);
+            if (fieldsOrdered.Count > 0)
-            fieldsByName = fieldsOrdered.ToImmutableDictionary(x => x.Name);
+            {
+                fieldsById = fieldsOrdered.ToImmutableDictionary(x => x.Id);
+                fieldsByName = fieldsOrdered.ToImmutableDictionary(x => x.Name);
+            }
+            else
+            {
+                fieldsById = ImmutableDictionary<long, Field>.Empty;
+                fieldsByName = ImmutableDictionary<string, Field>.Empty;
+            }
         }
 
         [Pure]
@@ -87,8 +99,8 @@ namespace Squidex.Domain.Apps.Core.Schemas
 
             return Clone(clone =>
             {
-                properties = newProperties;
+                clone.properties = newProperties;
-                properties.Freeze();
+                clone.properties.Freeze();
             });
         }
 
@@ -151,7 +163,7 @@ namespace Squidex.Domain.Apps.Core.Schemas
         {
             return Clone(clone =>
             {
-                isPublished = true;
+                clone.isPublished = true;
             });
         }
 
@@ -160,7 +172,7 @@ namespace Squidex.Domain.Apps.Core.Schemas
         {
             return Clone(clone =>
             {
-                isPublished = false;
+                clone.isPublished = false;
             });
         }
 

src/Squidex.Infrastructure/Cloneable.cs

@@ -0,0 +1,30 @@
+// ==========================================================================
+//  Cloneable.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+
+namespace Squidex.Infrastructure
+{
+    public abstract class Cloneable
+    {
+        protected T Clone<T>(Action<T> updater) where T : Cloneable
+        {
+            var clone = (T)MemberwiseClone();
+
+            updater(clone);
+
+            clone.OnCloned();
+
+            return clone;
+        }
+
+        protected virtual void OnCloned()
+        {
+        }
+    }
+}

src/Squidex.Infrastructure/Cloneable{T}.cs

@@ -0,0 +1,20 @@
+// ==========================================================================
+//  Cloneable{T}.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+
+namespace Squidex.Infrastructure
+{
+    public abstract class Cloneable<T> : Cloneable where T : Cloneable
+    {
+        protected T Clone(Action<T> updater)
+        {
+            return base.Clone<T>(updater);
+        }
+    }
+}

src/Squidex.Infrastructure/Freezable.cs

@@ -0,0 +1,30 @@
+// ==========================================================================
+//  Freezable.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+
+namespace Squidex.Infrastructure
+{
+    public abstract class Freezable
+    {
+        public bool IsFrozen { get; private set; }
+
+        protected void ThrowIfFrozen()
+        {
+            if (IsFrozen)
+            {
+                throw new InvalidOperationException("Object is frozen");
+            }
+        }
+
+        public void Freeze()
+        {
+            IsFrozen = true;
+        }
+    }
+}

tests/Squidex.Domain.Apps.Core.Tests/Model/Schemas/SchemaFieldTests.cs

@@ -10,16 +10,19 @@ using System;
 using Squidex.Domain.Apps.Core.Schemas;
 using Xunit;
 
+#pragma warning disable SA1310 // Field names must not contain underscore
+
 namespace Squidex.Domain.Apps.Core.Model.Schemas
 {
     public class SchemaFieldTests
     {
-        private readonly NumberField sut = new NumberField(1, "my-field", Partitioning.Invariant);
+        private readonly NumberField field_0 = new NumberField(1, "my-field", Partitioning.Invariant);
 
         [Fact]
         public void Should_instantiate_field()
         {
-            Assert.Equal("my-field", sut.Name);
+            Assert.True(field_0.RawProperties.IsFrozen);
+            Assert.Equal("my-field", field_0.Name);
         }
 
         [Fact]
@@ -31,61 +34,122 @@ namespace Squidex.Domain.Apps.Core.Model.Schemas
         [Fact]
         public void Should_hide_field()
         {
-            sut.Hide();
+            var field_1 = field_0.Hide();
-            sut.Hide();
+            var field_2 = field_1.Hide();
 
-            Assert.True(sut.IsHidden);
+            Assert.False(field_0.IsHidden);
+            Assert.True(field_2.IsHidden);
         }
 
         [Fact]
         public void Should_show_field()
         {
-            sut.Hide();
+            var field_1 = field_0.Hide();
-            sut.Show();
+            var field_2 = field_1.Show();
-            sut.Show();
+            var field_3 = field_2.Show();
 
-            Assert.False(sut.IsHidden);
+            Assert.True(field_1.IsHidden);
+            Assert.False(field_3.IsHidden);
         }
 
         [Fact]
         public void Should_disable_field()
         {
-            sut.Disable();
+            var field_1 = field_0.Disable();
-            sut.Disable();
+            var field_2 = field_1.Disable();
 
-            Assert.True(sut.IsDisabled);
+            Assert.False(field_0.IsDisabled);
+            Assert.True(field_2.IsDisabled);
         }
 
         [Fact]
         public void Should_enable_field()
         {
-            sut.Disable();
+            var field_1 = field_0.Disable();
-            sut.Enable();
+            var field_2 = field_1.Enable();
-            sut.Enable();
+            var field_3 = field_2.Enable();
 
-            Assert.False(sut.IsDisabled);
+            Assert.True(field_1.IsDisabled);
+            Assert.False(field_3.IsDisabled);
         }
 
         [Fact]
         public void Should_lock_field()
         {
-            sut.Lock();
+            var field_1 = field_0.Lock();
 
-            Assert.True(sut.IsLocked);
+            Assert.False(field_0.IsLocked);
+            Assert.True(field_1.IsLocked);
         }
 
         [Fact]
         public void Should_update_field()
         {
-            sut.Update(new NumberFieldProperties { Hints = "my-hints" });
+            var field_1 = field_0.Update(new NumberFieldProperties { Hints = "my-hints" });
 
-            Assert.Equal("my-hints", sut.RawProperties.Hints);
+            Assert.Null(field_0.RawProperties.Hints);
+            Assert.True(field_1.RawProperties.IsFrozen);
+            Assert.Equal("my-hints", field_1.RawProperties.Hints);
         }
 
         [Fact]
         public void Should_throw_exception_if_updating_with_invalid_properties_type()
         {
-            Assert.Throws<ArgumentException>(() => sut.Update(new StringFieldProperties()));
+            Assert.Throws<ArgumentException>(() => field_0.Update(new StringFieldProperties()));
+        }
+
+        [Fact]
+        public void Should_freeze_asset_field_properties()
+        {
+            TestData.TestFreeze(new AssetsFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_boolean_field_properties()
+        {
+            TestData.TestFreeze(new BooleanFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_datetime_field_properties()
+        {
+            TestData.TestFreeze(new DateTimeFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_geolocation_field_properties()
+        {
+            TestData.TestFreeze(new GeolocationFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_json_field_properties()
+        {
+            TestData.TestFreeze(new JsonFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_number_field_properties()
+        {
+            TestData.TestFreeze(new NumberFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_references_field_properties()
+        {
+            TestData.TestFreeze(new ReferencesFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_string_field_properties()
+        {
+            TestData.TestFreeze(new StringFieldProperties());
+        }
+
+        [Fact]
+        public void Should_freeze_tags_field_properties()
+        {
+            TestData.TestFreeze(new TagsFieldProperties());
         }
     }
 }

tests/Squidex.Domain.Apps.Core.Tests/Model/Schemas/SchemaTests.cs

@@ -15,17 +15,20 @@ using Newtonsoft.Json.Linq;
 using Squidex.Domain.Apps.Core.Schemas;
 using Xunit;
 
+#pragma warning disable SA1310 // Field names must not contain underscore
+
 namespace Squidex.Domain.Apps.Core.Model.Schemas
 {
     public class SchemaTests
     {
         private readonly JsonSerializer serializer = TestData.DefaultSerializer();
-        private readonly Schema sut = new Schema("my-schema");
+        private readonly Schema schema_0 = new Schema("my-schema");
 
         [Fact]
         public void Should_instantiate_schema()
         {
-            Assert.Equal("my-schema", sut.Name);
+            Assert.True(schema_0.Properties.IsFrozen);
+            Assert.Equal("my-schema", schema_0.Name);
         }
 
         [Fact]
@@ -39,108 +42,242 @@ namespace Squidex.Domain.Apps.Core.Model.Schemas
         {
             var properties = new SchemaProperties { Hints = "my-hint", Label = "my-label" };
 
-            sut.Update(properties);
+            var schema_1 = schema_0.Update(properties);
 
-            Assert.Equal(properties, sut.Properties);
+            Assert.NotSame(properties, schema_0.Properties);
+            Assert.Same(properties, schema_1.Properties);
         }
 
         [Fact]
         public void Should_add_field()
         {
-            var field = AddNumberField(1);
+            var field = CreateField(1);
+
+            var schema_1 = schema_0.AddField(field);
 
-            Assert.Equal(field, sut.FieldsById[1]);
+            Assert.Empty(schema_0.Fields);
+            Assert.Equal(field, schema_1.FieldsById[1]);
         }
 
         [Fact]
         public void Should_throw_exception_if_adding_field_with_name_that_already_exists()
         {
-            AddNumberField(1);
+            var schema_1 = schema_0.AddField(CreateField(1));
 
-            Assert.Throws<ArgumentException>(() => sut.AddField(new NumberField(2, "my-field-1", Partitioning.Invariant)));
+            Assert.Throws<ArgumentException>(() => schema_1.AddField(new NumberField(2, "my-field-1", Partitioning.Invariant)));
         }
 
         [Fact]
         public void Should_throw_exception_if_adding_field_with_id_that_already_exists()
         {
-            AddNumberField(1);
+            var schema_1 = schema_0.AddField(CreateField(1));
 
-            Assert.Throws<ArgumentException>(() => sut.AddField(new NumberField(1, "my-field-2", Partitioning.Invariant)));
+            Assert.Throws<ArgumentException>(() => schema_1.AddField(new NumberField(1, "my-field-2", Partitioning.Invariant)));
         }
 
         [Fact]
-        public void Should_throw_exception_if_updating_with_invalid_properties_type()
+        public void Should_hide_field()
+        {
+            var schema_1 = schema_0.AddField(CreateField(1));
+
+            var schema_2 = schema_1.HideField(1);
+            var schema_3 = schema_2.HideField(1);
+
+            Assert.False(schema_1.FieldsById[1].IsHidden);
+            Assert.True(schema_3.FieldsById[1].IsHidden);
+        }
+
+        [Fact]
+        public void Should_return_same_schema_if_field_to_hide_does_not_exist()
+        {
+            var schema_1 = schema_0.HideField(1);
+
+            Assert.Same(schema_0, schema_1);
+        }
+
+        [Fact]
+        public void Should_show_field()
+        {
+            var schema_1 = schema_0.AddField(CreateField(1));
+
+            var schema_2 = schema_1.HideField(1);
+            var schema_3 = schema_2.ShowField(1);
+            var schema_4 = schema_3.ShowField(1);
+
+            Assert.True(schema_2.FieldsById[1].IsHidden);
+            Assert.False(schema_4.FieldsById[1].IsHidden);
+        }
+
+        [Fact]
+        public void Should_return_same_schema_if_field_to_show_does_not_exist()
+        {
+            var schema_1 = schema_0.ShowField(1);
+
+            Assert.Same(schema_0, schema_1);
+        }
+
+        [Fact]
+        public void Should_disable_field()
+        {
+            var schema_1 = schema_0.AddField(CreateField(1));
+
+            var schema_2 = schema_1.DisableField(1);
+            var schema_3 = schema_2.DisableField(1);
+
+            Assert.False(schema_1.FieldsById[1].IsDisabled);
+            Assert.True(schema_3.FieldsById[1].IsDisabled);
+        }
+
+        [Fact]
+        public void Should_return_same_schema_if_field_to_disable_does_not_exist()
+        {
+            var schema_1 = schema_0.DisableField(1);
+
+            Assert.Same(schema_0, schema_1);
+        }
+
+        [Fact]
+        public void Should_enable_field()
         {
-            AddNumberField(1);
+            var schema_1 = schema_0.AddField(CreateField(1));
 
-            Assert.Throws<ArgumentException>(() => sut.FieldsById[1].Update(new StringFieldProperties()));
+            var schema_2 = schema_1.DisableField(1);
+            var schema_3 = schema_2.EnableField(1);
+            var schema_4 = schema_3.EnableField(1);
+
+            Assert.True(schema_2.FieldsById[1].IsDisabled);
+            Assert.False(schema_4.FieldsById[1].IsDisabled);
+        }
+
+        [Fact]
+        public void Should_return_same_schema_if_field_to_enable_does_not_exist()
+        {
+            var schema_1 = schema_0.EnableField(1);
+
+            Assert.Same(schema_0, schema_1);
+        }
+
+        [Fact]
+        public void Should_lock_field()
+        {
+            var schema_1 = schema_0.AddField(CreateField(1));
+
+            var schema_2 = schema_1.LockField(1);
+            var schema_3 = schema_2.LockField(1);
+
+            Assert.False(schema_1.FieldsById[1].IsLocked);
+            Assert.True(schema_3.FieldsById[1].IsLocked);
+        }
+
+        [Fact]
+        public void Should_return_same_schema_if_field_to_lock_does_not_exist()
+        {
+            var schema_1 = schema_0.LockField(1);
+
+            Assert.Same(schema_0, schema_1);
+        }
+
+        [Fact]
+        public void Should_update_field()
+        {
+            var properties = new NumberFieldProperties();
+
+            var schema_1 = schema_0.AddField(CreateField(1));
+            var schema_2 = schema_1.UpdateField(1, properties);
+
+            Assert.NotSame(properties, schema_1.FieldsById[1].RawProperties);
+            Assert.Same(properties, schema_2.FieldsById[1].RawProperties);
         }
 
         [Fact]
-        public void Should_do_nothing_if_field_to_delete_not_found()
+        public void Should_throw_exception_if_updating_with_invalid_properties_type()
         {
-            AddNumberField(1);
+            var schema_1 = schema_0.AddField(CreateField(1));
+
+            Assert.Throws<ArgumentException>(() => schema_1.UpdateField(1, new StringFieldProperties()));
+        }
 
-            sut.DeleteField(2);
+        [Fact]
+        public void Should_return_same_schema_if_field_to_update_does_not_exist()
+        {
+            var schema_1 = schema_0.UpdateField(1, new StringFieldProperties());
 
-            Assert.Equal(1, sut.FieldsById.Count);
+            Assert.Same(schema_0, schema_1);
         }
 
         [Fact]
         public void Should_delete_field()
         {
-            AddNumberField(1);
+            var schema_1 = schema_0.AddField(CreateField(1));
+            var schema_2 = schema_1.DeleteField(1);
+
+            Assert.Empty(schema_2.FieldsById);
+        }
 
-            sut.DeleteField(1);
+        [Fact]
+        public void Should_return_same_schema_if_field_to_delete_does_not_exist()
+        {
+            var schema_1 = schema_0.DeleteField(1);
 
-            Assert.Empty(sut.FieldsById);
+            Assert.Same(schema_0, schema_1);
         }
 
         [Fact]
         public void Should_publish_schema()
         {
-            sut.Publish();
+            var schema_1 = schema_0.Publish();
 
-            Assert.True(sut.IsPublished);
+            Assert.False(schema_0.IsPublished);
+            Assert.True(schema_1.IsPublished);
         }
 
         [Fact]
         public void Should_unpublish_schema()
         {
-            sut.Publish();
+            var schema_1 = schema_0.Publish();
-            sut.Unpublish();
+            var schema_2 = schema_1.Unpublish();
 
-            Assert.False(sut.IsPublished);
+            Assert.True(schema_1.IsPublished);
+            Assert.False(schema_2.IsPublished);
         }
 
         [Fact]
         public void Should_reorder_fields()
         {
-            var field1 = AddNumberField(1);
+            var field1 = CreateField(1);
-            var field2 = AddNumberField(2);
+            var field2 = CreateField(2);
-            var field3 = AddNumberField(3);
+            var field3 = CreateField(3);
 
-            sut.ReorderFields(new List<long> { 3, 2, 1 });
+            var schema_1 = schema_0.AddField(field1);
+            var schema_2 = schema_1.AddField(field2);
+            var schema_3 = schema_2.AddField(field3);
+            var schema_4 = schema_3.ReorderFields(new List<long> { 3, 2, 1 });
 
-            Assert.Equal(new List<Field> { field3, field2, field1 }, sut.Fields.ToList());
+            Assert.Equal(new List<Field> { field3, field2, field1 }, schema_4.Fields.ToList());
         }
 
         [Fact]
         public void Should_throw_exception_if_not_all_fields_are_covered_for_reordering()
         {
-            AddNumberField(1);
+            var field1 = CreateField(1);
-            AddNumberField(2);
+            var field2 = CreateField(2);
 
-            Assert.Throws<ArgumentException>(() => sut.ReorderFields(new List<long> { 1 }));
+            var schema_1 = schema_0.AddField(field1);
+            var schema_2 = schema_1.AddField(field2);
+
+            Assert.Throws<ArgumentException>(() => schema_2.ReorderFields(new List<long> { 1 }));
         }
 
         [Fact]
         public void Should_throw_exception_if_field_to_reorder_does_not_exist()
         {
-            AddNumberField(1);
+            var field1 = CreateField(1);
-            AddNumberField(2);
+            var field2 = CreateField(2);
+
+            var schema_1 = schema_0.AddField(field1);
+            var schema_2 = schema_1.AddField(field2);
 
-            Assert.Throws<ArgumentException>(() => sut.ReorderFields(new List<long> { 1, 4 }));
+            Assert.Throws<ArgumentException>(() => schema_2.ReorderFields(new List<long> { 1, 4 }));
         }
 
         [Fact]
@@ -152,13 +289,9 @@ namespace Squidex.Domain.Apps.Core.Model.Schemas
             schemaTarget.ShouldBeEquivalentTo(schemaSource);
         }
 
-        private NumberField AddNumberField(int id)
+        private static NumberField CreateField(int id)
         {
-            var field = new NumberField(id, $"my-field-{id}", Partitioning.Invariant);
+            return new NumberField(id, $"my-field-{id}", Partitioning.Invariant);
-
-            sut.AddField(field);
-
-            return field;
         }
     }
 }

tests/Squidex.Domain.Apps.Core.Tests/Operations/ConvertContent/ContentConversionTests.cs

@@ -21,21 +21,20 @@ namespace Squidex.Domain.Apps.Core.Operations.ConvertContent
 {
     public class ContentConversionTests
     {
-        private readonly Schema schema = new Schema("my-schema");
+        private readonly Schema schema;
         private readonly LanguagesConfig languagesConfig = LanguagesConfig.Build(Language.EN, Language.DE);
 
         public ContentConversionTests()
         {
-            schema.AddField(new NumberField(1, "field1", Partitioning.Language));
+            schema =
-            schema.AddField(new NumberField(2, "field2", Partitioning.Invariant));
+                new Schema("my-schema")
-            schema.AddField(new NumberField(3, "field3", Partitioning.Invariant));
+                    .AddField(new NumberField(1, "field1", Partitioning.Language))
-
+                    .AddField(new NumberField(2, "field2", Partitioning.Invariant))
-            schema.AddField(new AssetsField(5, "assets1", Partitioning.Invariant));
+                    .AddField(new NumberField(3, "field3", Partitioning.Invariant))
-            schema.AddField(new AssetsField(6, "assets2", Partitioning.Invariant));
+                    .AddField(new AssetsField(5, "assets1", Partitioning.Invariant))
-
+                    .AddField(new AssetsField(6, "assets2", Partitioning.Invariant))
-            schema.AddField(new JsonField(4, "json", Partitioning.Language));
+                    .AddField(new JsonField(4, "json", Partitioning.Language))
-
+                    .HideField(3);
-            schema.FieldsById[3].Hide();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Core.Tests/Operations/EnrichContent/ContentEnrichmentTests.cs

@@ -28,19 +28,16 @@ namespace Squidex.Domain.Apps.Core.Operations.EnrichContent
 
         public ContentEnrichmentTests()
         {
-            schema = new Schema("my-schema");
+            schema =
-
+                new Schema("my-schema")
-            schema.AddField(new StringField(1, "my-string", Partitioning.Language,
+                    .AddField(new StringField(1, "my-string", Partitioning.Language,
-                new StringFieldProperties { DefaultValue = "en-string" }));
+                        new StringFieldProperties { DefaultValue = "en-string" }))
-
+                    .AddField(new NumberField(2, "my-number", Partitioning.Invariant,
-            schema.AddField(new NumberField(2, "my-number", Partitioning.Invariant,
+                        new NumberFieldProperties()))
-                new NumberFieldProperties()));
+                    .AddField(new DateTimeField(3, "my-datetime", Partitioning.Invariant,
-
+                            new DateTimeFieldProperties { DefaultValue = Now }))
-            schema.AddField(new DateTimeField(3, "my-datetime", Partitioning.Invariant,
+                    .AddField(new BooleanField(4, "my-boolean", Partitioning.Invariant,
-                new DateTimeFieldProperties { DefaultValue = Now }));
+                        new BooleanFieldProperties { DefaultValue = true }));
-
-            schema.AddField(new BooleanField(4, "my-boolean", Partitioning.Invariant,
-                new BooleanFieldProperties { DefaultValue = true }));
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Core.Tests/Operations/ExtractReferenceIds/ReferenceExtractionTests.cs

@@ -24,21 +24,20 @@ namespace Squidex.Domain.Apps.Core.Operations.ExtractReferenceIds
     public class ReferenceExtractionTests
     {
         private readonly Guid schemaId = Guid.NewGuid();
-        private readonly Schema schema = new Schema("my-schema");
+        private readonly Schema schema;
         private readonly LanguagesConfig languagesConfig = LanguagesConfig.Build(Language.EN, Language.DE);
 
         public ReferenceExtractionTests()
         {
-            schema.AddField(new NumberField(1, "field1", Partitioning.Language));
+            schema =
-            schema.AddField(new NumberField(2, "field2", Partitioning.Invariant));
+                new Schema("my-schema")
-            schema.AddField(new NumberField(3, "field3", Partitioning.Invariant));
+                    .AddField(new NumberField(1, "field1", Partitioning.Language))
-
+                    .AddField(new NumberField(2, "field2", Partitioning.Invariant))
-            schema.AddField(new AssetsField(5, "assets1", Partitioning.Invariant));
+                    .AddField(new NumberField(3, "field3", Partitioning.Invariant))
-            schema.AddField(new AssetsField(6, "assets2", Partitioning.Invariant));
+                    .AddField(new AssetsField(5, "assets1", Partitioning.Invariant))
-
+                    .AddField(new AssetsField(6, "assets2", Partitioning.Invariant))
-            schema.AddField(new JsonField(4, "json", Partitioning.Language));
+                    .AddField(new JsonField(4, "json", Partitioning.Language))
-
+                    .HideField(3);
-            schema.FieldsById[3].Hide();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/ContentValidationTests.cs

@@ -23,7 +23,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         private readonly LanguagesConfig languagesConfig = LanguagesConfig.Build(Language.DE, Language.EN);
         private readonly List<ValidationError> errors = new List<ValidationError>();
         private readonly ValidationContext context = ValidationTestExtensions.ValidContext;
-        private readonly Schema schema = new Schema("my-schema");
+        private Schema schema = new Schema("my-schema");
 
         [Fact]
         public async Task Should_add_error_if_validating_data_with_unknown_field()
@@ -45,7 +45,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_validating_data_with_invalid_field()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
                 new NumberFieldProperties { MaxValue = 100 }));
 
             var data =
@@ -66,7 +66,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_non_localizable_data_field_contains_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant));
 
             var data =
                 new NamedContentData()
@@ -88,7 +88,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_validating_data_with_invalid_localizable_field()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language,
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language,
                 new NumberFieldProperties { IsRequired = true }));
 
             var data =
@@ -107,7 +107,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_required_data_field_is_not_in_bag()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
                 new NumberFieldProperties { IsRequired = true }));
 
             var data =
@@ -125,7 +125,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_data_contains_invalid_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
 
             var data =
                 new NamedContentData()
@@ -151,7 +151,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
                     new LanguageConfig(Language.ES, false),
                     new LanguageConfig(Language.IT, true));
 
-            schema.AddField(new StringField(1, "my-field", Partitioning.Language,
+            schema = schema.AddField(new StringField(1, "my-field", Partitioning.Language,
                 new StringFieldProperties { IsRequired = true }));
 
             var data =
@@ -168,7 +168,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_data_contains_unsupported_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
 
             var data =
                 new NamedContentData()
@@ -207,7 +207,8 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_validating_partial_data_with_invalid_field()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant, new NumberFieldProperties { MaxValue = 100 }));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
+                new NumberFieldProperties { MaxValue = 100 }));
 
             var data =
                 new NamedContentData()
@@ -227,7 +228,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_non_localizable_partial_data_field_contains_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant));
 
             var data =
                 new NamedContentData()
@@ -249,7 +250,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_not_add_error_if_validating_partial_data_with_invalid_localizable_field()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language,
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language,
                 new NumberFieldProperties { IsRequired = true }));
 
             var data =
@@ -263,7 +264,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_not_add_error_if_required_partial_data_field_is_not_in_bag()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Invariant,
                 new NumberFieldProperties { IsRequired = true }));
 
             var data =
@@ -277,7 +278,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_partial_data_contains_invalid_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
 
             var data =
                 new NamedContentData()
@@ -298,7 +299,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         [Fact]
         public async Task Should_add_error_if_partial_data_contains_unsupported_language()
         {
-            schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
+            schema = schema.AddField(new NumberField(1, "my-field", Partitioning.Language));
 
             var data =
                 new NamedContentData()

tests/Squidex.Domain.Apps.Core.Tests/TestData.cs

@@ -6,7 +6,10 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Collections.Immutable;
+using System.Linq;
+using System.Reflection;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
 using Squidex.Domain.Apps.Core.Apps.Json;
@@ -15,6 +18,7 @@ using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Core.Schemas.Json;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.Json;
+using Xunit;
 
 namespace Squidex.Domain.Apps.Core
 {
@@ -96,5 +100,46 @@ namespace Squidex.Domain.Apps.Core
 
             return schema;
         }
+
+        public static void TestFreeze(Freezable freezable)
+        {
+            var sut = new AssetsFieldProperties();
+
+            foreach (var property in sut.GetType().GetRuntimeProperties().Where(x => x.Name != "IsFrozen"))
+            {
+                var value =
+                    property.PropertyType.GetTypeInfo().IsValueType ?
+                        Activator.CreateInstance(property.PropertyType) :
+                        null;
+
+                property.SetValue(sut, value);
+
+                var result = property.GetValue(sut);
+
+                Assert.Equal(value, result);
+            }
+
+            sut.Freeze();
+
+            foreach (var property in sut.GetType().GetRuntimeProperties().Where(x => x.Name != "IsFrozen"))
+            {
+                var value =
+                    property.PropertyType.GetTypeInfo().IsValueType ?
+                        Activator.CreateInstance(property.PropertyType) :
+                        null;
+
+                Assert.Throws<InvalidOperationException>(() =>
+                {
+                    try
+                    {
+                        property.SetValue(sut, value);
+                    }
+                    catch (Exception ex)
+                    {
+                        throw ex.InnerException;
+                    }
+                });
+            }
+        }
     }
 }