Fix generation of Interface when return type of the method has a list of Unions #1018

src/main/java/com/kobylynskyi/graphql/codegen/java/JavaGraphQLTypeMapper.java

@@ -101,7 +101,7 @@ public NamedDefinition getLanguageType(MappingContext mappingContext, String gra
             serializeUsingObjectMapper = true;
         }
 
-        return new NamedDefinition(langTypeName, graphQLType, mappingContext.getInterfacesName().contains(graphQLType),
+        return new NamedDefinition(langTypeName, graphQLType, isInterfaceOrUnion(mappingContext, graphQLType),
                 mandatory, primitiveCanBeUsed, serializeUsingObjectMapper);
     }
 

src/main/java/com/kobylynskyi/graphql/codegen/mapper/GraphQLTypeMapper.java

@@ -177,7 +177,8 @@ public NamedDefinition getLanguageType(MappingContext mappingContext, Type<?> gr
         } else if (graphqlType instanceof ListType) {
             NamedDefinition mappedCollectionType = getLanguageType(mappingContext, ((ListType) graphqlType).getType(),
                     name, parentTypeName, false, true);
-            if (mappedCollectionType.isInterface() && mappingContext.getInterfacesName().contains(parentTypeName)) {
+            if (mappedCollectionType.isInterfaceOrUnion() &&
+                    isInterfaceOrUnion(mappingContext, parentTypeName)) {
                 mappedCollectionType.setJavaName(
                         wrapSuperTypeIntoList(mappingContext, mappedCollectionType.getJavaName(), mandatory));
             } else {
@@ -223,7 +224,7 @@ public NamedDefinition getLanguageType(MappingContext mappingContext, String gra
                 serializeFieldsUsingObjectMapper.contains(graphQLType) ||
                         serializeFieldsUsingObjectMapper.contains(parentTypeName + "." + name);
 
-        return new NamedDefinition(langTypeName, graphQLType, mappingContext.getInterfacesName().contains(graphQLType),
+        return new NamedDefinition(langTypeName, graphQLType, isInterfaceOrUnion(mappingContext, graphQLType),
                 mandatory, primitiveCanBeUsed, serializeUsingObjectMapper);
     }
 
@@ -247,4 +248,9 @@ public String getResponseReturnType(MappingContext mappingContext,
         return computedTypeName;
     }
 
+    protected boolean isInterfaceOrUnion(MappingContext mappingContext, String graphQLType) {
+        return mappingContext.getInterfacesName().contains(graphQLType) ||
+                mappingContext.getUnionsNames().contains(graphQLType);
+    }
+
 }

src/main/java/com/kobylynskyi/graphql/codegen/model/MappingContext.java

@@ -29,6 +29,7 @@ public class MappingContext implements GraphQLCodegenConfiguration {
     private final ExtendedDocument document;
     private final Set<String> typesUnionsInterfacesNames;
     private final Set<String> interfacesName;
+    private final Set<String> unionsName;
     private final Set<String> operationsName;
     private final Map<String, Set<String>> interfaceChildren;
     private final GeneratedInformation generatedInformation;
@@ -47,6 +48,7 @@ private MappingContext(File outputDirectory,
         this.document = document;
         this.typesUnionsInterfacesNames = document.getTypesUnionsInterfacesNames();
         this.interfacesName = document.getInterfacesNames();
+        this.unionsName = document.getUnionsNames();
         this.interfaceChildren = document.getInterfaceChildren();
         this.generatedInformation = generatedInformation;
         this.operationsName = document.getOperationsNames();
@@ -346,6 +348,10 @@ public Set<String> getInterfacesName() {
         return interfacesName;
     }
 
+    public Set<String> getUnionsNames() {
+        return unionsName;
+    }
+
     public Set<String> getOperationsName() {
         return operationsName;
     }

src/main/java/com/kobylynskyi/graphql/codegen/model/NamedDefinition.java

@@ -7,17 +7,17 @@ public class NamedDefinition {
 
     private String javaName;
     private String graphqlTypeName;
-    private boolean isInterface;
+    private boolean isInterfaceOrUnion;
     private boolean mandatory;
     private boolean primitiveCanBeUsed;
     private boolean serializeUsingObjectMapper;
 
     public NamedDefinition(String javaName, String graphqlTypeName,
-                           boolean isInterface, boolean mandatory,
+                           boolean isInterfaceOrUnion, boolean mandatory,
                            boolean primitiveCanBeUsed, boolean serializeUsingObjectMapper) {
         this.javaName = javaName;
         this.graphqlTypeName = graphqlTypeName;
-        this.isInterface = isInterface;
+        this.isInterfaceOrUnion = isInterfaceOrUnion;
         this.mandatory = mandatory;
         this.primitiveCanBeUsed = primitiveCanBeUsed;
         this.serializeUsingObjectMapper = serializeUsingObjectMapper;
@@ -39,12 +39,12 @@ public void setGraphqlTypeName(String graphqlTypeName) {
         this.graphqlTypeName = graphqlTypeName;
     }
 
-    public boolean isInterface() {
-        return isInterface;
+    public boolean isInterfaceOrUnion() {
+        return isInterfaceOrUnion;
     }
 
-    public void setInterface(boolean anInterface) {
-        isInterface = anInterface;
+    public void setInterfaceOrUnion(boolean interfaceOrUnion) {
+        isInterfaceOrUnion = interfaceOrUnion;
     }
 
     public boolean isMandatory() {

src/main/java/com/kobylynskyi/graphql/codegen/model/definitions/ExtendedDocument.java

@@ -88,6 +88,12 @@ public Set<String> getInterfacesNames() {
                 .collect(Collectors.toSet());
     }
 
+    public Set<String> getUnionsNames() {
+        return unionDefinitions.stream()
+                .map(ExtendedDefinition::getName)
+                .collect(Collectors.toSet());
+    }
+
     public Set<String> getOperationsNames() {
         return operationDefinitions.stream()
                 .map(ExtendedObjectTypeDefinition::getFieldDefinitions)

src/test/java/com/kobylynskyi/graphql/codegen/GraphQLCodegenUnionResolverTest.java

@@ -30,11 +30,6 @@ void init() {
         mappingConfig.setGenerateJacksonTypeIdResolver(true);
     }
 
-    private List<File> generate(String s) throws IOException {
-        return new JavaGraphQLCodegen(singletonList(s), outputBuildDir, mappingConfig,
-                TestUtils.getStaticGeneratedInfo()).generate();
-    }
-
     @AfterEach
     void cleanup() {
         Utils.deleteDir(outputBuildDir);
@@ -48,8 +43,8 @@ void generate_CheckFiles_with_model_package() throws Exception {
         File outputJavaClassesDir = new File("build/generated/com/kobylynskyi/graphql/unionresolver");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.java", "UnionMemberA.java",
-                "UnionMemberB.java", "UnionToResolve.java");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.java", "ResultObject.java",
+                "UnionMemberA.java", "UnionMemberB.java", "UnionToResolve.java");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -70,8 +65,8 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
         File outputJavaClassesDir = new File("build/generated");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.java", "MyUnionMemberASuffix.java",
-                "MyUnionMemberBSuffix.java", "MyUnionToResolveSuffix.java");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.java", "MyResultObjectSuffix.java",
+                "MyUnionMemberASuffix.java", "MyUnionMemberBSuffix.java", "MyUnionToResolveSuffix.java");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -82,4 +77,10 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
                     file);
         }
     }
+
+    private void generate(String path) throws IOException {
+        new JavaGraphQLCodegen(singletonList(path), outputBuildDir, mappingConfig,
+                TestUtils.getStaticGeneratedInfo()).generate();
+    }
+
 }

src/test/java/com/kobylynskyi/graphql/codegen/kotlin/GraphQLCodegenUnionResolverTest.java

@@ -32,11 +32,6 @@ void init() {
         mappingConfig.setGeneratedLanguage(GeneratedLanguage.KOTLIN);
     }
 
-    private List<File> generate(String s) throws IOException {
-        return new KotlinGraphQLCodegen(singletonList(s), outputBuildDir, mappingConfig,
-                TestUtils.getStaticGeneratedInfo()).generate();
-    }
-
     @AfterEach
     void cleanup() {
         Utils.deleteDir(outputBuildDir);
@@ -50,8 +45,8 @@ void generate_CheckFiles_with_model_package() throws Exception {
         File outputJavaClassesDir = new File("build/generated/com/kobylynskyi/graphql/unionresolver");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.kt", "UnionMemberA.kt",
-                "UnionMemberB.kt", "UnionToResolve.kt");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.kt", "ResultObject.kt",
+                "UnionMemberA.kt", "UnionMemberB.kt", "UnionToResolve.kt");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -72,8 +67,8 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
         File outputJavaClassesDir = new File("build/generated");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.kt", "MyUnionMemberASuffix.kt",
-                "MyUnionMemberBSuffix.kt", "MyUnionToResolveSuffix.kt");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.kt", "MyResultObjectSuffix.kt",
+                "MyUnionMemberASuffix.kt", "MyUnionMemberBSuffix.kt", "MyUnionToResolveSuffix.kt");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -85,4 +80,10 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
                     file);
         }
     }
+
+    private void generate(String path) throws IOException {
+        new KotlinGraphQLCodegen(singletonList(path), outputBuildDir, mappingConfig,
+                TestUtils.getStaticGeneratedInfo()).generate();
+    }
+
 }

src/test/java/com/kobylynskyi/graphql/codegen/scala/GraphQLCodegenUnionResolverTest.java

@@ -32,11 +32,6 @@ void init() {
         mappingConfig.setGeneratedLanguage(GeneratedLanguage.SCALA);
     }
 
-    private List<File> generate(String s) throws IOException {
-        return new ScalaGraphQLCodegen(singletonList(s), outputBuildDir, mappingConfig,
-                TestUtils.getStaticGeneratedInfo()).generate();
-    }
-
     @AfterEach
     void cleanup() {
         Utils.deleteDir(outputBuildDir);
@@ -50,8 +45,8 @@ void generate_CheckFiles_with_model_package() throws Exception {
         File outputJavaClassesDir = new File("build/generated/com/kobylynskyi/graphql/unionresolver");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.scala", "UnionMemberA.scala",
-                "UnionMemberB.scala", "UnionToResolve.scala");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.scala", "ResultObject.scala",
+                "UnionMemberA.scala", "UnionMemberB.scala", "UnionToResolve.scala");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -72,8 +67,8 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
         File outputJavaClassesDir = new File("build/generated");
         File[] files = Objects.requireNonNull(outputJavaClassesDir.listFiles());
         List<String> generatedFileNames = Arrays.stream(files).map(File::getName).sorted().collect(toList());
-        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.scala", "MyUnionMemberASuffix.scala",
-                "MyUnionMemberBSuffix.scala", "MyUnionToResolveSuffix.scala");
+        List<String> expectedClasses = Arrays.asList("GraphqlJacksonTypeIdResolver.scala", "MyResultObjectSuffix.scala",
+                "MyUnionMemberASuffix.scala", "MyUnionMemberBSuffix.scala", "MyUnionToResolveSuffix.scala");
         assertEquals(expectedClasses, generatedFileNames);
 
         for (File file : files) {
@@ -85,4 +80,10 @@ void generate_CheckFiles_without_model_package_and_with_prefix_and_suffix() thro
                     file);
         }
     }
+
+    private void generate(String path) throws IOException {
+        new ScalaGraphQLCodegen(singletonList(path), outputBuildDir, mappingConfig,
+                TestUtils.getStaticGeneratedInfo()).generate();
+    }
+
 }

src/test/resources/expected-classes/jackson-resolver-union/ResultObject.java.txt

@@ -0,0 +1,12 @@
+package com.kobylynskyi.graphql.unionresolver;
+
+
+@javax.annotation.Generated(
+    value = "com.kobylynskyi.graphql.codegen.GraphQLCodegen",
+    date = "2020-12-31T23:59:59-0500"
+)
+public interface ResultObject {
+
+    java.util.List<? extends UnionToResolve> getList();
+
+}

src/test/resources/expected-classes/jackson-resolver-union/without-model-package/MyResultObjectSuffix.java.txt

@@ -0,0 +1,9 @@
+@javax.annotation.Generated(
+    value = "com.kobylynskyi.graphql.codegen.GraphQLCodegen",
+    date = "2020-12-31T23:59:59-0500"
+)
+public interface MyResultObjectSuffix {
+
+    java.util.List<? extends MyUnionToResolveSuffix> getList();
+
+}

src/test/resources/expected-classes/kt/jackson-resolver-union/ResultObject.kt.txt

@@ -0,0 +1,12 @@
+package com.kobylynskyi.graphql.unionresolver
+
+
+@javax.annotation.Generated(
+    value = ["com.kobylynskyi.graphql.codegen.GraphQLCodegen"],
+    date = "2020-12-31T23:59:59-0500"
+)
+interface ResultObject {
+
+    val list: List<out UnionToResolve>?
+
+}

src/test/resources/expected-classes/kt/jackson-resolver-union/without-model-package/MyResultObjectSuffix.kt.txt

@@ -0,0 +1,9 @@
+@javax.annotation.Generated(
+    value = ["com.kobylynskyi.graphql.codegen.GraphQLCodegen"],
+    date = "2020-12-31T23:59:59-0500"
+)
+interface MyResultObjectSuffix {
+
+    val list: List<out MyUnionToResolveSuffix>?
+
+}

src/test/resources/expected-classes/scala/jackson-resolver-union/ResultObject.scala.txt

@@ -0,0 +1,12 @@
+package com.kobylynskyi.graphql.unionresolver
+
+
+@javax.annotation.Generated(
+    value = Array("com.kobylynskyi.graphql.codegen.GraphQLCodegen"),
+    date = "2020-12-31T23:59:59-0500"
+)
+trait ResultObject {
+
+    val list: scala.Seq[_ <: UnionToResolve]
+
+}

src/test/resources/expected-classes/scala/jackson-resolver-union/without-model-package/MyResultObjectSuffix.scala.txt

@@ -0,0 +1,9 @@
+@javax.annotation.Generated(
+    value = Array("com.kobylynskyi.graphql.codegen.GraphQLCodegen"),
+    date = "2020-12-31T23:59:59-0500"
+)
+trait MyResultObjectSuffix {
+
+    val list: scala.Seq[_ <: MyUnionToResolveSuffix]
+
+}

src/test/resources/schemas/union-resolver.graphqls

@@ -1,3 +1,7 @@
+interface ResultObject {
+    list: [UnionToResolve!]
+}
+
 type UnionMemberA {
     someField: Int
 }