GraphQL improvements.

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/GraphQLModel.cs

@@ -28,9 +28,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
 {
     public sealed class GraphQLModel : IGraphModel
     {
-        private readonly Dictionary<ISchemaEntity, ContentGraphType> contentTypes = new Dictionary<ISchemaEntity, ContentGraphType>();
-        private readonly Dictionary<ISchemaEntity, ContentDataGraphType> contentDataTypes = new Dictionary<ISchemaEntity, ContentDataGraphType>();
-        private readonly Dictionary<Guid, ISchemaEntity> schemasById;
+        private readonly Dictionary<Guid, ContentGraphType> contentTypes = new Dictionary<Guid, ContentGraphType>();
         private readonly PartitionResolver partitionResolver;
         private readonly IAppEntity app;
         private readonly IGraphType assetType;
@@ -54,34 +52,47 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
             assetType = new AssetGraphType(this);
             assetListType = new ListGraphType(new NonNullGraphType(assetType));
 
-            schemasById = schemas.Where(x => x.SchemaDef.IsPublished).ToDictionary(x => x.Id);
+            var allSchemas = schemas.Where(x => x.SchemaDef.IsPublished).ToList();
 
-            graphQLSchema = BuildSchema(this, pageSizeContents, pageSizeAssets);
+            BuildSchemas(allSchemas);
+
+            graphQLSchema = BuildSchema(this, pageSizeContents, pageSizeAssets, allSchemas);
             graphQLSchema.RegisterValueConverter(JsonConverter.Instance);
 
             InitializeContentTypes();
         }
 
-        private static GraphQLSchema BuildSchema(GraphQLModel model, int pageSizeContents, int pageSizeAssets)
+        private void BuildSchemas(List<ISchemaEntity> allSchemas)
         {
-            var schemas = model.schemasById.Values;
-
-            return new GraphQLSchema { Query = new AppQueriesGraphType(model, pageSizeContents, pageSizeAssets, schemas) };
+            foreach (var schema in allSchemas)
+            {
+                contentTypes[schema.Id] = new ContentGraphType(schema);
+            }
         }
 
         private void InitializeContentTypes()
         {
-            foreach (var kvp in contentDataTypes)
+            foreach (var contentType in contentTypes.Values)
             {
-                kvp.Value.Initialize(this, kvp.Key);
+                contentType.Initialize(this);
             }
 
-            foreach (var kvp in contentTypes)
+            foreach (var contentType in contentTypes.Values)
             {
-                kvp.Value.Initialize(this, kvp.Key, contentDataTypes[kvp.Key]);
+                graphQLSchema.RegisterType(contentType);
             }
         }
 
+        private static GraphQLSchema BuildSchema(GraphQLModel model, int pageSizeContents, int pageSizeAssets, List<ISchemaEntity> schemas)
+        {
+            var schema = new GraphQLSchema
+            {
+                Query = new AppQueriesGraphType(model, pageSizeContents, pageSizeAssets, schemas)
+            };
+
+            return schema;
+        }
+
         public IFieldResolver ResolveAssetUrl()
         {
             var resolver = new FuncFieldResolver<IAssetEntity, object>(c =>
@@ -137,7 +148,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
 
         public (IGraphType ResolveType, ValueResolver Resolver) GetGraphType(ISchemaEntity schema, IField field, string fieldName)
         {
-            return field.Accept(new QueryGraphTypeVisitor(schema, contentTypes, GetContentType, this, assetListType, fieldName));
+            return field.Accept(new QueryGraphTypeVisitor(schema, contentTypes, this, assetListType, fieldName));
         }
 
         public IObjectGraphType GetAssetType()
@@ -147,16 +158,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
 
         public IObjectGraphType GetContentType(Guid schemaId)
         {
-            var schema = schemasById.GetOrDefault(schemaId);
-
-            if (schema == null)
-            {
-                return null;
-            }
-
-            contentDataTypes.GetOrAdd(schema, s => new ContentDataGraphType());
-
-            return contentTypes.GetOrAdd(schema, s => new ContentGraphType());
+            return contentTypes.GetOrDefault(schemaId);
         }
 
         public async Task<(object Data, object[] Errors)> ExecuteAsync(GraphQLExecutionContext context, GraphQLQuery query)

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/AssetGraphType.cs

@@ -17,7 +17,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
     {
         public AssetGraphType(IGraphModel model)
         {
-            Name = "AssetDto";
+            Name = "Asset";
 
             AddField(new FieldType
             {

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ContentDataGraphType.cs

@@ -18,21 +18,10 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 {
     public sealed class ContentDataGraphType : ObjectGraphType<NamedContentData>
     {
-        public ContentDataGraphType(ISchemaEntity schema)
+        public ContentDataGraphType(ISchemaEntity schema, string schemaName, string schemaType, IGraphModel model)
         {
-            var schemaType = schema.TypeName();
-            var schemaName = schema.DisplayName();
-
             Name = $"{schemaType}DataDto";
 
-            Description = $"The structure of the {schemaName} content type.";
-        }
-
-        public void Initialize(IGraphModel model, ISchemaEntity schema)
-        {
-            var schemaType = schema.TypeName();
-            var schemaName = schema.DisplayName();
-
             foreach (var (field, fieldName, typeName) in schema.SchemaDef.Fields.SafeFields())
             {
                 var (resolvedType, valueResolver) = model.GetGraphType(schema, field, fieldName);
@@ -72,6 +61,8 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
                     });
                 }
             }
+
+            Description = $"The structure of the {schemaName} content type.";
         }
 
         private static FuncFieldResolver<object> PartitionResolver(ValueResolver valueResolver, string key)

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ContentGraphType.cs

@@ -15,12 +15,18 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 {
     public sealed class ContentGraphType : ObjectGraphType<IEnrichedContentEntity>
     {
-        public ContentGraphType(IGraphModel model, ISchemaEntity schema, IComplexGraphType contentDataType)
+        private readonly ISchemaEntity schema;
+        private readonly string schemaType;
+        private readonly string schemaName;
+
+        public ContentGraphType(ISchemaEntity schema)
         {
-            var schemaType = schema.TypeName();
-            var schemaName = schema.DisplayName();
+            this.schema = schema;
+
+            schemaType = schema.TypeName();
+            schemaName = schema.DisplayName();
 
-            Name = $"{schemaType}Dto";
+            Name = $"{schemaType}";
 
             AddField(new FieldType
             {
@@ -86,90 +92,20 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
                 Description = $"The color status of the {schemaName} content."
             });
 
-            AddField(new FieldType
-            {
-                Name = "url",
-                ResolvedType = AllTypes.NonNullString,
-                Resolver = model.ResolveContentUrl(schema),
-                Description = $"The url to the the {schemaName} content."
-            });
-
             Interface<ContentInterfaceGraphType>();
 
             Description = $"The structure of a {schemaName} content type.";
+
+            IsTypeOf = CheckType;
         }
 
-        public void Initialize(IGraphModel model, ISchemaEntity schema, IComplexGraphType contentDataType)
+        private bool CheckType(object value)
         {
-            var schemaType = schema.TypeName();
-            var schemaName = schema.DisplayName();
-
-            Name = $"{schemaType}Dto";
-
-            AddField(new FieldType
-            {
-                Name = "id",
-                ResolvedType = AllTypes.NonNullGuid,
-                Resolver = Resolve(x => x.Id),
-                Description = $"The id of the {schemaName} content."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "version",
-                ResolvedType = AllTypes.NonNullInt,
-                Resolver = Resolve(x => x.Version),
-                Description = $"The version of the {schemaName} content."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "created",
-                ResolvedType = AllTypes.NonNullDate,
-                Resolver = Resolve(x => x.Created),
-                Description = $"The date and time when the {schemaName} content has been created."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "createdBy",
-                ResolvedType = AllTypes.NonNullString,
-                Resolver = Resolve(x => x.CreatedBy.ToString()),
-                Description = $"The user that has created the {schemaName} content."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "lastModified",
-                ResolvedType = AllTypes.NonNullDate,
-                Resolver = Resolve(x => x.LastModified),
-                Description = $"The date and time when the {schemaName} content has been modified last."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "lastModifiedBy",
-                ResolvedType = AllTypes.NonNullString,
-                Resolver = Resolve(x => x.LastModifiedBy.ToString()),
-                Description = $"The user that has updated the {schemaName} content last."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "status",
-                ResolvedType = AllTypes.NonNullString,
-                Resolver = Resolve(x => x.Status.Name.ToUpperInvariant()),
-                Description = $"The the status of the {schemaName} content."
-            });
-
-            AddField(new FieldType
-            {
-                Name = "statusColor",
-                ResolvedType = AllTypes.NonNullString,
-                Resolver = Resolve(x => x.StatusColor),
-                Description = $"The color status of the {schemaName} content."
-            });
+           return value is IContentEntity content && content.SchemaId?.Id == schema.Id;
+        }
 
+        public void Initialize(IGraphModel model)
+        {
             AddField(new FieldType
             {
                 Name = "url",
@@ -178,6 +114,8 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
                 Description = $"The url to the the {schemaName} content."
             });
 
+            var contentDataType = new ContentDataGraphType(schema, schemaName, schemaType, model);
+
             if (contentDataType.Fields.Any())
             {
                 AddField(new FieldType
@@ -196,10 +134,6 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
                     Description = $"The draft data of the {schemaName} content."
                 });
             }
-
-            Interface<ContentInterfaceGraphType>();
-
-            Description = $"The structure of a {schemaName} content type.";
         }
 
         private static IFieldResolver Resolve(Func<IEnrichedContentEntity, object> action)

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ContentInterfaceGraphType.cs

@@ -5,20 +5,23 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System;
+using GraphQL.Resolvers;
 using GraphQL.Types;
 
 namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 {
-    public sealed class ContentInterfaceGraphType : InterfaceGraphType
+    public sealed class ContentInterfaceGraphType : InterfaceGraphType<IContentEntity>
     {
         public ContentInterfaceGraphType()
         {
-            Name = $"ContentInfaceDto";
+            Name = $"Content";
 
             AddField(new FieldType
             {
                 Name = "id",
                 ResolvedType = AllTypes.NonNullGuid,
+                Resolver = Resolve(x => x.Id),
                 Description = $"The id of the content."
             });
 
@@ -26,6 +29,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "version",
                 ResolvedType = AllTypes.NonNullInt,
+                Resolver = Resolve(x => x.Version),
                 Description = $"The version of the content."
             });
 
@@ -33,6 +37,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "created",
                 ResolvedType = AllTypes.NonNullDate,
+                Resolver = Resolve(x => x.Created),
                 Description = $"The date and time when the content has been created."
             });
 
@@ -40,6 +45,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "createdBy",
                 ResolvedType = AllTypes.NonNullString,
+                Resolver = Resolve(x => x.CreatedBy.ToString()),
                 Description = $"The user that has created the content."
             });
 
@@ -47,6 +53,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "lastModified",
                 ResolvedType = AllTypes.NonNullDate,
+                Resolver = Resolve(x => x.LastModified),
                 Description = $"The date and time when the content has been modified last."
             });
 
@@ -54,6 +61,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "lastModifiedBy",
                 ResolvedType = AllTypes.NonNullString,
+                Resolver = Resolve(x => x.LastModifiedBy.ToString()),
                 Description = $"The user that has updated the content last."
             });
 
@@ -61,6 +69,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "status",
                 ResolvedType = AllTypes.NonNullString,
+                Resolver = Resolve(x => x.Status.Name.ToUpperInvariant()),
                 Description = $"The the status of the content."
             });
 
@@ -68,17 +77,16 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 Name = "statusColor",
                 ResolvedType = AllTypes.NonNullString,
+                Resolver = Resolve(x => x.StatusColor),
                 Description = $"The color status of the content."
             });
 
-            AddField(new FieldType
-            {
-                Name = "url",
-                ResolvedType = AllTypes.NonNullString,
-                Description = $"The url to the the content."
-            });
-
             Description = $"The structure of all content types.";
         }
+
+        private static IFieldResolver Resolve(Func<IEnrichedContentEntity, object> action)
+        {
+            return new FuncFieldResolver<IEnrichedContentEntity, object>(c => action(c.Source));
+        }
     }
 }

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ReferenceGraphType.cs → src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/ContentUnionGraphType.cs

@@ -9,16 +9,15 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using GraphQL.Types;
-using Squidex.Domain.Apps.Entities.Schemas;
 using Squidex.Infrastructure;
 
 namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 {
-    public sealed class ReferenceGraphType : UnionGraphType
+    public sealed class ContentUnionGraphType : UnionGraphType
     {
         private readonly Dictionary<Guid, IObjectGraphType> types = new Dictionary<Guid, IObjectGraphType>();
 
-        public ReferenceGraphType(string fieldName, IDictionary<ISchemaEntity, ContentGraphType> schemaTypes, IEnumerable<Guid> schemaIds, Func<Guid, IObjectGraphType> schemaResolver)
+        public ContentUnionGraphType(string fieldName, Dictionary<Guid, ContentGraphType> schemaTypes, IEnumerable<Guid> schemaIds)
         {
             Name = $"{fieldName}ReferenceUnionDto";
 
@@ -26,7 +25,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 foreach (var schemaId in schemaIds)
                 {
-                    var schemaType = schemaResolver(schemaId);
+                    var schemaType = schemaTypes.GetOrDefault(schemaId);
 
                     if (schemaType != null)
                     {
@@ -38,7 +37,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 foreach (var schemaType in schemaTypes)
                 {
-                    types[schemaType.Key.Id] = schemaType.Value;
+                    types[schemaType.Key] = schemaType.Value;
                 }
             }
 
@@ -51,7 +50,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             {
                 if (value is IContentEntity content)
                 {
-                    return types.GetOrDefault(content.Id);
+                    return types.GetOrDefault(content.SchemaId.Id);
                 }
 
                 return null;

src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/QueryGraphTypeVisitor.cs

@@ -11,6 +11,7 @@ using System.Linq;
 using GraphQL.Types;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Entities.Schemas;
+using Squidex.Infrastructure;
 using Squidex.Infrastructure.Json.Objects;
 
 namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
@@ -20,16 +21,14 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
     public sealed class QueryGraphTypeVisitor : IFieldVisitor<(IGraphType ResolveType, ValueResolver Resolver)>
     {
         private static readonly ValueResolver NoopResolver = (value, c) => value;
+        private readonly Dictionary<Guid, ContentGraphType> schemaTypes;
         private readonly ISchemaEntity schema;
-        private readonly Func<Guid, IObjectGraphType> schemaResolver;
-        private readonly IDictionary<ISchemaEntity, ContentGraphType> schemaTypes;
         private readonly IGraphModel model;
         private readonly IGraphType assetListType;
         private readonly string fieldName;
 
         public QueryGraphTypeVisitor(ISchemaEntity schema,
-            IDictionary<ISchemaEntity, ContentGraphType> schemaTypes,
-            Func<Guid, IObjectGraphType> schemaResolver,
+            Dictionary<Guid, ContentGraphType> schemaTypes,
             IGraphModel model,
             IGraphType assetListType,
             string fieldName)
@@ -37,7 +36,6 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
             this.model = model;
             this.assetListType = assetListType;
             this.schema = schema;
-            this.schemaResolver = schemaResolver;
             this.schemaTypes = schemaTypes;
             this.fieldName = fieldName;
         }
@@ -123,11 +121,11 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 
         private (IGraphType ResolveType, ValueResolver Resolver) ResolveReferences(IField<ReferencesFieldProperties> field)
         {
-            IGraphType contentType = schemaResolver(field.Properties.SingleId());
+            IGraphType contentType = schemaTypes.GetOrDefault(field.Properties.SingleId());
 
             if (contentType == null)
             {
-                var union = new ReferenceGraphType(fieldName, schemaTypes, field.Properties.SchemaIds, schemaResolver);
+                var union = new ContentUnionGraphType(fieldName, schemaTypes, field.Properties.SchemaIds);
 
                 if (!union.PossibleTypes.Any())
                 {

src/Squidex.Domain.Users/UserManagerExtensions.cs

@@ -6,7 +6,6 @@
 // ==========================================================================
 
 using System;
-using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Security.Claims;

src/Squidex/Areas/Api/Controllers/Schemas/Models/Converters/FieldPropertiesDtoFactory.cs

@@ -30,6 +30,15 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models.Converters
             return SimpleMapper.Map(properties, new ArrayFieldPropertiesDto());
         }
 
+        public FieldPropertiesDto Visit(AssetsFieldProperties properties)
+        {
+            var result = SimpleMapper.Map(properties, new AssetsFieldPropertiesDto());
+
+            result.AllowedExtensions = properties.AllowedExtensions?.ToArray();
+
+            return result;
+        }
+
         public FieldPropertiesDto Visit(BooleanFieldProperties properties)
         {
             return SimpleMapper.Map(properties, new BooleanFieldPropertiesDto());
@@ -50,50 +59,45 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models.Converters
             return SimpleMapper.Map(properties, new JsonFieldPropertiesDto());
         }
 
-        public FieldPropertiesDto Visit(ReferencesFieldProperties properties)
-        {
-            return SimpleMapper.Map(properties, new ReferencesFieldPropertiesDto());
-        }
-
-        public FieldPropertiesDto Visit(UIFieldProperties properties)
-        {
-            return SimpleMapper.Map(properties, new UIFieldPropertiesDto());
-        }
-
-        public FieldPropertiesDto Visit(TagsFieldProperties properties)
+        public FieldPropertiesDto Visit(NumberFieldProperties properties)
         {
-            var result = SimpleMapper.Map(properties, new TagsFieldPropertiesDto());
+            var result = SimpleMapper.Map(properties, new NumberFieldPropertiesDto());
 
             result.AllowedValues = properties.AllowedValues?.ToArray();
 
             return result;
         }
 
-        public FieldPropertiesDto Visit(AssetsFieldProperties properties)
+        public FieldPropertiesDto Visit(ReferencesFieldProperties properties)
         {
-            var result = SimpleMapper.Map(properties, new AssetsFieldPropertiesDto());
+            var result = SimpleMapper.Map(properties, new ReferencesFieldPropertiesDto());
 
-            result.AllowedExtensions = properties.AllowedExtensions?.ToArray();
+            result.SchemaIds = properties.SchemaIds?.ToArray();
 
             return result;
         }
 
-        public FieldPropertiesDto Visit(NumberFieldProperties properties)
+        public FieldPropertiesDto Visit(StringFieldProperties properties)
         {
-            var result = SimpleMapper.Map(properties, new NumberFieldPropertiesDto());
+            var result = SimpleMapper.Map(properties, new StringFieldPropertiesDto());
 
             result.AllowedValues = properties.AllowedValues?.ToArray();
 
             return result;
         }
 
-        public FieldPropertiesDto Visit(StringFieldProperties properties)
+        public FieldPropertiesDto Visit(TagsFieldProperties properties)
         {
-            var result = SimpleMapper.Map(properties, new StringFieldPropertiesDto());
+            var result = SimpleMapper.Map(properties, new TagsFieldPropertiesDto());
 
             result.AllowedValues = properties.AllowedValues?.ToArray();
 
             return result;
         }
+
+        public FieldPropertiesDto Visit(UIFieldProperties properties)
+        {
+            return SimpleMapper.Map(properties, new UIFieldPropertiesDto());
+        }
     }
 }

src/Squidex/Areas/Api/Controllers/Schemas/Models/Fields/ReferencesFieldPropertiesDto.cs

@@ -7,6 +7,7 @@
 
 using System;
 using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Infrastructure.Collections;
 using Squidex.Infrastructure.Reflection;
 
 namespace Squidex.Areas.Api.Controllers.Schemas.Models.Fields
@@ -39,13 +40,20 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models.Fields
         public ReferencesFieldEditor Editor { get; set; }
 
         /// <summary>
-        /// The id of the referenced schema.
+        /// The id of the referenced schemas.
         /// </summary>
-        public Guid SchemaId { get; set; }
+        public Guid[] SchemaIds { get; set; }
 
         public override FieldProperties ToProperties()
         {
-            return SimpleMapper.Map(this, new ReferencesFieldProperties());
+            var result = SimpleMapper.Map(this, new ReferencesFieldProperties());
+
+            if (SchemaIds != null)
+            {
+                result.SchemaIds = ReadOnlyCollection.Create(SchemaIds);
+            }
+
+            return result;
         }
     }
 }

tests/Squidex.Domain.Apps.Entities.Tests/Contents/GraphQL/GraphQLQueriesTests.cs

@@ -18,6 +18,95 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
 {
     public class GraphQLQueriesTests : GraphQLTestBase
     {
+        [Fact]
+        public async Task Should_introspect()
+        {
+            const string query = @"              
+                query IntrospectionQuery {
+                  __schema {
+                    queryType { name }
+                    mutationType { name }
+                    subscriptionType { name }
+                    types {
+                      ...FullType
+                    }
+                    directives {
+                      name
+                      description
+                      args {
+                        ...InputValue
+                      }
+                      onOperation
+                      onFragment
+                      onField
+                    }
+                  }
+                }
+
+                fragment FullType on __Type {
+                  kind
+                  name
+                  description
+                  fields(includeDeprecated: true) {
+                    name
+                    description
+                    args {
+                      ...InputValue
+                    }
+                    type {
+                      ...TypeRef
+                    }
+                    isDeprecated
+                    deprecationReason
+                  }
+                  inputFields {
+                    ...InputValue
+                  }
+                  interfaces {
+                    ...TypeRef
+                  }
+                  enumValues(includeDeprecated: true) {
+                    name
+                    description
+                    isDeprecated
+                    deprecationReason
+                  }
+                  possibleTypes {
+                    ...TypeRef
+                  }
+                }
+
+                fragment InputValue on __InputValue {
+                  name
+                  description
+                  type { ...TypeRef }
+                  defaultValue
+                }
+
+                fragment TypeRef on __Type {
+                  kind
+                  name
+                  ofType {
+                    kind
+                    name
+                    ofType {
+                      kind
+                      name
+                      ofType {
+                        kind
+                        name
+                      }
+                    }
+                  }
+                }";
+
+            var result = await sut.QueryAsync(requestContext, new GraphQLQuery { Query = query, OperationName = "IntrospectionQuery" });
+
+            var json = serializer.Serialize(result.Response, true);
+
+            Assert.NotEmpty(json);
+        }
+
         [Theory]
         [InlineData(null)]
         [InlineData("")]
@@ -775,7 +864,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
         public async Task Should_also_fetch_referenced_contents_when_field_is_included_in_query()
         {
             var contentRefId = Guid.NewGuid();
-            var contentRef = CreateRefContent(contentRefId, "ref1-field", "ref1");
+            var contentRef = CreateRefContent(schemaRefId1, contentRefId, "ref1-field", "ref1");
 
             var contentId = Guid.NewGuid();
             var content = CreateContent(contentId, contentRefId, Guid.Empty);
@@ -845,7 +934,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
         public async Task Should_also_fetch_union_contents_when_field_is_included_in_query()
         {
             var contentRefId = Guid.NewGuid();
-            var contentRef = CreateRefContent(contentRefId, "ref1-field", "ref1");
+            var contentRef = CreateRefContent(schemaRefId1, contentRefId, "ref1-field", "ref1");
 
             var contentId = Guid.NewGuid();
             var content = CreateContent(contentId, contentRefId, Guid.Empty);
@@ -857,15 +946,17 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
                     data {
                       myUnion {
                         iv {
-                          id
-                          __typename
-                          ...MyRefSchema1Dto {
+                          ... on Content {
+                            id
+                          }
+                          ... on MyRefSchema1 {
                             data {
                               ref1Field {
                                 iv
                               }
                             }
                           }
+                          __typename
                         }
                       }
                     }
@@ -889,14 +980,13 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
                         id = content.Id,
                         data = new
                         {
-                            myReferences = new
+                            myUnion = new
                             {
                                 iv = new[]
                                 {
                                     new
                                     {
                                         id = contentRefId,
-                                        __typename = "MyRefSchema1Dto",
                                         data = new
                                         {
                                             ref1Field = new
@@ -904,6 +994,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
                                                 iv = "ref1"
                                             }
                                         },
+                                        __typename = "MyRefSchema1"
                                     }
                                 }
                             }

tests/Squidex.Domain.Apps.Entities.Tests/Contents/GraphQL/GraphQLTestBase.cs

@@ -109,7 +109,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
             sut = CreateSut();
         }
 
-        protected static IEnrichedContentEntity CreateContent(Guid id, Guid refId, Guid assetId, NamedContentData data = null, NamedContentData dataDraft = null)
+        protected IEnrichedContentEntity CreateContent(Guid id, Guid refId, Guid assetId, NamedContentData data = null, NamedContentData dataDraft = null)
         {
             var now = SystemClock.Instance.GetCurrentInstant();
 
@@ -173,6 +173,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
                 LastModifiedBy = new RefToken(RefTokenType.Subject, "user2"),
                 Data = data,
                 DataDraft = dataDraft,
+                SchemaId = schemaId,
                 Status = Status.Draft,
                 StatusColor = "red"
             };
@@ -180,7 +181,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
             return content;
         }
 
-        protected static IEnrichedContentEntity CreateRefContent(Guid id, string field, string value)
+        protected static IEnrichedContentEntity CreateRefContent(NamedId<Guid> schemaId, Guid id, string field, string value)
         {
             var now = SystemClock.Instance.GetCurrentInstant();
 
@@ -200,6 +201,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL
                 LastModifiedBy = new RefToken(RefTokenType.Subject, "user2"),
                 Data = data,
                 DataDraft = data,
+                SchemaId = schemaId,
                 Status = Status.Draft,
                 StatusColor = "red"
             };