[Fusion] Added requirements argument to @fusion__requires

src/HotChocolate/Fusion-vnext/src/Fusion.Composition/Definitions/FusionRequiresMutableDirectiveDefinition.cs

@@ -13,6 +13,7 @@ internal sealed class FusionRequiresMutableDirectiveDefinition : MutableDirectiv
 {
     public FusionRequiresMutableDirectiveDefinition(
         MutableEnumTypeDefinition schemaMutableEnumType,
+        MutableScalarTypeDefinition fieldSelectionSetType,
         MutableScalarTypeDefinition fieldDefinitionType,
         MutableScalarTypeDefinition fieldSelectionMapType)
         : base(FusionRequires)
@@ -25,6 +26,12 @@ public FusionRequiresMutableDirectiveDefinition(
                 Description = FusionRequiresMutableDirectiveDefinition_Schema_Description
             });
 
+        Arguments.Add(
+            new MutableInputFieldDefinition(Requirements, new NonNullType(fieldSelectionSetType))
+            {
+                Description = FusionRequiresMutableDirectiveDefinition_Requirements_Description
+            });
+
         Arguments.Add(
             new MutableInputFieldDefinition(Field, new NonNullType(fieldDefinitionType))
             {

src/HotChocolate/Fusion-vnext/src/Fusion.Composition/Properties/CompositionResources.resx

@@ -96,6 +96,9 @@
   <data name="FusionRequiresMutableDirectiveDefinition_Map_Description" xml:space="preserve">
     <value>The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type.</value>
   </data>
+  <data name="FusionRequiresMutableDirectiveDefinition_Requirements_Description" xml:space="preserve">
+    <value>A selection set on the annotated field that describes its requirements.</value>
+  </data>
   <data name="FusionRequiresMutableDirectiveDefinition_Schema_Description" xml:space="preserve">
     <value>The name of the source schema where this field has requirements to data on other source schemas.</value>
   </data>

src/HotChocolate/Fusion-vnext/src/Fusion.Composition/SourceSchemaMerger.cs

@@ -405,7 +405,8 @@ private MutableInterfaceTypeDefinition MergeInterfaceTypes(
             .SelectMany(
                 i => ((MutableInterfaceTypeDefinition)i.Type).Fields.AsEnumerable(),
                 (i, f) => new OutputFieldInfo(f, (MutableComplexTypeDefinition)i.Type, i.Schema))
-            .GroupBy(i => i.Field.Name);
+            .GroupBy(i => i.Field.Name)
+            .ToImmutableArray();
 
         foreach (var fieldGroup in fieldGroupByName)
         {
@@ -417,6 +418,14 @@ private MutableInterfaceTypeDefinition MergeInterfaceTypes(
             }
         }
 
+        foreach (var (fieldName, fieldGroup) in fieldGroupByName)
+        {
+            if (interfaceType.Fields.TryGetField(fieldName, out var outputField))
+            {
+                AddFusionRequiresDirectives(outputField, interfaceType, [.. fieldGroup]);
+            }
+        }
+
         return interfaceType;
     }
 
@@ -485,7 +494,8 @@ .. typeGroup.Where(
             .SelectMany(
                 i => ((MutableObjectTypeDefinition)i.Type).Fields.AsEnumerable(),
                 (i, f) => new OutputFieldInfo(f, (MutableComplexTypeDefinition)i.Type, i.Schema))
-            .GroupBy(i => i.Field.Name);
+            .GroupBy(i => i.Field.Name)
+            .ToImmutableArray();
 
         foreach (var fieldGroup in fieldGroupByName)
         {
@@ -497,6 +507,14 @@ .. typeGroup.Where(
             }
         }
 
+        foreach (var (fieldName, fieldGroup) in fieldGroupByName)
+        {
+            if (objectType.Fields.TryGetField(fieldName, out var outputField))
+            {
+                AddFusionRequiresDirectives(outputField, objectType, [.. fieldGroup]);
+            }
+        }
+
         return objectType;
     }
 
@@ -560,7 +578,6 @@ .. typeGroup.Where(
         }
 
         AddFusionFieldDirectives(outputField, fieldGroup);
-        AddFusionRequiresDirectives(outputField, fieldGroup);
 
         if (fieldGroup.Any(i => i.Field.HasInaccessibleDirective()))
         {
@@ -1002,6 +1019,7 @@ private static List<string> GetFusionLookupMap(MutableOutputFieldDefinition fiel
 
     private void AddFusionRequiresDirectives(
         MutableOutputFieldDefinition field,
+        MutableComplexTypeDefinition complexType,
         ImmutableArray<OutputFieldInfo> fieldGroup)
     {
         foreach (var (sourceField, _, sourceSchema) in fieldGroup)
@@ -1025,6 +1043,22 @@ private void AddFusionRequiresDirectives(
             if (map.Any(v => v is not null))
             {
                 var schemaArgument = new EnumValueNode(_schemaConstantNames[sourceSchema]);
+                var requiresMap = map.Where(f => f is not null);
+                var selectedValues =
+                    requiresMap.Select(a => new FieldSelectionMapParser(a).Parse());
+                var selectedValueToSelectionSetRewriter =
+                    GetSelectedValueToSelectionSetRewriter(sourceSchema);
+                var selectionSets = selectedValues
+                    .Select(
+                        s =>
+                            selectedValueToSelectionSetRewriter
+                                .SelectedValueToSelectionSet(s, complexType))
+                    .ToImmutableArray();
+                var mergedSelectionSet = selectionSets.Length == 1
+                    ? selectionSets[0]
+                    : GetMergeSelectionSetRewriter(sourceSchema).Merge(selectionSets, complexType);
+                var requirementsArgument =
+                    mergedSelectionSet.ToString(indented: false).AsSpan()[2 .. ^2].ToString();
 
                 var fieldArgument =
                     _removeDirectivesRewriter
@@ -1039,6 +1073,7 @@ private void AddFusionRequiresDirectives(
                     new Directive(
                         _fusionDirectiveDefinitions[DirectiveNames.FusionRequires],
                         new ArgumentAssignment(ArgumentNames.Schema, schemaArgument),
+                        new ArgumentAssignment(ArgumentNames.Requirements, requirementsArgument),
                         new ArgumentAssignment(ArgumentNames.Field, fieldArgument),
                         new ArgumentAssignment(ArgumentNames.Map, mapArgument)));
             }
@@ -1155,6 +1190,7 @@ private FrozenDictionary<string, MutableDirectiveDefinition> CreateFusionDirecti
                 DirectiveNames.FusionRequires,
                 new FusionRequiresMutableDirectiveDefinition(
                     schemaEnumType,
+                    fieldSelectionSetType,
                     fieldDefinitionType,
                     fieldSelectionMapType)
             },

src/HotChocolate/Fusion-vnext/src/Fusion.Composition/WellKnownArgumentNames.cs

@@ -12,6 +12,7 @@ internal static class WellKnownArgumentNames
     public const string Partial = "partial";
     public const string Path = "path";
     public const string Provides = "provides";
+    public const string Requirements = "requirements";
     public const string Schema = "schema";
     public const string SourceType = "sourceType";
     public const string Value = "value";

src/HotChocolate/Fusion-vnext/src/Fusion.Execution.Types/Directives/RequireDirective.cs

@@ -6,12 +6,14 @@ namespace HotChocolate.Fusion.Types.Directives;
 /*
 directive @fusion__requires(
     schema: fusion__Schema!
+    requirements: fusion__FieldSelectionSet!
     field: fusion__FieldDefinition!
     map: [fusion__FieldSelectionMap]!
 ) repeatable on FIELD_DEFINITION
 */
 internal class RequireDirective(
     string schemaName,
+    SelectionSetNode requirements,
     FieldDefinitionNode field,
     ImmutableArray<string?> map)
 {
@@ -20,6 +22,9 @@ internal class RequireDirective(
     /// </summary>
     public string SchemaName { get; } = schemaName;
 
+    /// <summary>Gets the requirements for a field.</summary>
+    public SelectionSetNode Requirements { get; } = requirements;
+
     /// <summary>
     /// Gets the arguments that represent field requirements.
     /// </summary>

src/HotChocolate/Fusion-vnext/src/Fusion.Execution.Types/Directives/RequiredDirectiveParser.cs

@@ -12,6 +12,7 @@ public static bool CanParse(DirectiveNode directiveNode)
     public static RequireDirective Parse(DirectiveNode directiveNode)
     {
         string? schemaName = null;
+        SelectionSetNode? requirements = null;
         FieldDefinitionNode? field = null;
         ImmutableArray<string?>? map = null;
 
@@ -23,6 +24,17 @@ public static RequireDirective Parse(DirectiveNode directiveNode)
                     schemaName = ((EnumValueNode)argument.Value).Value;
                     break;
 
+                case "requirements":
+                    var requirementsSourceText = ((StringValueNode)argument.Value).Value.Trim();
+
+                    if (!requirementsSourceText.StartsWith('{'))
+                    {
+                        requirementsSourceText = $"{{ {requirementsSourceText} }}";
+                    }
+
+                    requirements = Utf8GraphQLParser.Syntax.ParseSelectionSet(requirementsSourceText);
+                    break;
+
                 case "field":
                     field = Utf8GraphQLParser.Syntax.ParseFieldDefinition(((StringValueNode)argument.Value).Value);
                     break;
@@ -43,6 +55,12 @@ public static RequireDirective Parse(DirectiveNode directiveNode)
                 "The `schema` argument is required on the @require directive.");
         }
 
+        if (requirements is null)
+        {
+            throw new DirectiveParserException(
+                "The `requirements` argument is required on the @require directive.");
+        }
+
         if (field is null)
         {
             throw new DirectiveParserException(
@@ -55,7 +73,7 @@ public static RequireDirective Parse(DirectiveNode directiveNode)
                 "The `map` argument is required on the @require directive.");
         }
 
-        return new RequireDirective(schemaName, field, map.Value);
+        return new RequireDirective(schemaName, requirements, field, map.Value);
     }
 
     private static ImmutableArray<string?> ParseMap(IValueNode value)

src/HotChocolate/Fusion-vnext/test/Fusion.CommandLine.Tests/__resources__/invalid-example-1/result/composite-schema.graphqls

@@ -56,7 +56,7 @@ directive @fusion__inputField("The name of the source schema that originally pro
 directive @fusion__lookup("The GraphQL field definition in the source schema that can be used to look up the entity." field: fusion__FieldDefinition! "A selection set on the annotated entity type that describes the stable key for the lookup." key: fusion__FieldSelectionSet! "The map describes how the key values are resolved from the annotated entity type." map: [fusion__FieldSelectionMap!]! "The path to the lookup field relative to the Query type." path: fusion__FieldSelectionPath "The name of the source schema where the annotated entity type can be looked up from." schema: fusion__Schema!) repeatable on OBJECT | INTERFACE | UNION
 
 "The @fusion__requires directive specifies if a field has requirements on a source schema."
-directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
+directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "A selection set on the annotated field that describes its requirements." requirements: fusion__FieldSelectionSet! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
 
 "The @fusion__type directive specifies which source schemas provide parts of a composite type."
 directive @fusion__type("The name of the source schema that originally provided part of the annotated type." schema: fusion__Schema!) repeatable on SCALAR | OBJECT | INTERFACE | UNION | ENUM | INPUT_OBJECT

src/HotChocolate/Fusion-vnext/test/Fusion.CommandLine.Tests/__resources__/valid-example-1/result/composite-schema.graphqls

@@ -40,7 +40,7 @@ directive @fusion__inputField("The name of the source schema that originally pro
 directive @fusion__lookup("The GraphQL field definition in the source schema that can be used to look up the entity." field: fusion__FieldDefinition! "A selection set on the annotated entity type that describes the stable key for the lookup." key: fusion__FieldSelectionSet! "The map describes how the key values are resolved from the annotated entity type." map: [fusion__FieldSelectionMap!]! "The path to the lookup field relative to the Query type." path: fusion__FieldSelectionPath "The name of the source schema where the annotated entity type can be looked up from." schema: fusion__Schema!) repeatable on OBJECT | INTERFACE | UNION
 
 "The @fusion__requires directive specifies if a field has requirements on a source schema."
-directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
+directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "A selection set on the annotated field that describes its requirements." requirements: fusion__FieldSelectionSet! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
 
 "The @fusion__type directive specifies which source schemas provide parts of a composite type."
 directive @fusion__type("The name of the source schema that originally provided part of the annotated type." schema: fusion__Schema!) repeatable on SCALAR | OBJECT | INTERFACE | UNION | ENUM | INPUT_OBJECT

src/HotChocolate/Fusion-vnext/test/Fusion.Composition.Tests/SourceSchemaMerger.Argument.Tests.cs

@@ -161,12 +161,18 @@ type Query
                     """
                     type Product {
                         id: ID!
+                        dimension: ProductDimension!
                         delivery(
                             zip: String!
                             size: Int! @require(field: "dimension.size")
                             weight: Int! @require(field: "dimension.weight")
                         ): DeliveryEstimates
                     }
+
+                    type ProductDimension {
+                        size: Int!
+                        weight: Int!
+                    }
                     """
                 ],
                 """
@@ -175,11 +181,21 @@ type Product
                     delivery(zip: String!
                         @fusion__inputField(schema: A)): DeliveryEstimates
                         @fusion__field(schema: A)
-                        @fusion__requires(schema: A, field: "delivery(zip: String! size: Int! weight: Int!): DeliveryEstimates", map: [ null, "dimension.size", "dimension.weight" ])
+                        @fusion__requires(schema: A, requirements: "dimension { size weight }", field: "delivery(zip: String! size: Int! weight: Int!): DeliveryEstimates", map: [ null, "dimension.size", "dimension.weight" ])
+                    dimension: ProductDimension!
+                        @fusion__field(schema: A)
                     id: ID!
                         @fusion__field(schema: A)
                 }
 
+                type ProductDimension
+                    @fusion__type(schema: A) {
+                    size: Int!
+                        @fusion__field(schema: A)
+                    weight: Int!
+                        @fusion__field(schema: A)
+                }
+
                 scalar DeliveryEstimates
                     @fusion__type(schema: A)
                 """

src/HotChocolate/Fusion-vnext/test/Fusion.Composition.Tests/SourceSchemaMerger.OutputField.Tests.cs

@@ -129,6 +129,7 @@ type Product
                     """
                     # Schema A
                     type Product {
+                        percent: Int
                         discountPercentage(percent: Int): Int
                     }
                     """,
@@ -146,7 +147,9 @@ type Product
                     discountPercentage: Int
                         @fusion__field(schema: A)
                         @fusion__field(schema: B)
-                        @fusion__requires(schema: B, field: "discountPercentage(percent: Int): Int", map: [ "percent" ])
+                        @fusion__requires(schema: B, requirements: "percent", field: "discountPercentage(percent: Int): Int", map: [ "percent" ])
+                    percent: Int
+                        @fusion__field(schema: A)
                 }
                 """
             },

src/HotChocolate/Fusion-vnext/test/Fusion.Composition.Tests/__snapshots__/SourceSchemaMergerTests.Merge_FourNamedSchemas_AddsFusionDefinitions.graphql

@@ -29,7 +29,7 @@ directive @fusion__inputField("The name of the source schema that originally pro
 directive @fusion__lookup("The GraphQL field definition in the source schema that can be used to look up the entity." field: fusion__FieldDefinition! "A selection set on the annotated entity type that describes the stable key for the lookup." key: fusion__FieldSelectionSet! "The map describes how the key values are resolved from the annotated entity type." map: [fusion__FieldSelectionMap!]! "The path to the lookup field relative to the Query type." path: fusion__FieldSelectionPath "The name of the source schema where the annotated entity type can be looked up from." schema: fusion__Schema!) repeatable on OBJECT | INTERFACE | UNION
 
 "The @fusion__requires directive specifies if a field has requirements on a source schema."
-directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
+directive @fusion__requires("The GraphQL field definition in the source schema that this field depends on." field: fusion__FieldDefinition! "The map describes how the argument values for the source schema are resolved from the arguments of the field exposed in the client-facing composite schema and from required data relative to the current type." map: [fusion__FieldSelectionMap]! "A selection set on the annotated field that describes its requirements." requirements: fusion__FieldSelectionSet! "The name of the source schema where this field has requirements to data on other source schemas." schema: fusion__Schema!) repeatable on FIELD_DEFINITION
 
 "The @fusion__type directive specifies which source schemas provide parts of a composite type."
 directive @fusion__type("The name of the source schema that originally provided part of the annotated type." schema: fusion__Schema!) repeatable on SCALAR | OBJECT | INTERFACE | UNION | ENUM | INPUT_OBJECT