Fix handling of default values in schema for complex types. (#648)

Author: srinivasankavitha

graphql-dgs-codegen-core/src/main/kotlin/com/netflix/graphql/dgs/codegen/generators/java/DataTypeGenerator.kt

@@ -146,6 +146,7 @@ class InputTypeGenerator(config: CodeGenConfig, document: Document) : BaseDataTy
                             }
                         }.joinToString()
                     )
+                    is ObjectValue -> CodeBlock.of("new \$L()", typeUtils.findReturnType(it.type))
                     else -> CodeBlock.of("\$L", defVal)
                 }
             }

graphql-dgs-codegen-core/src/test/kotlin/com/netflix/graphql/dgs/codegen/CodeGenTest.kt

@@ -1593,6 +1593,32 @@ class CodeGenTest {
         assertCompilesJava(enumTypes + dataTypes)
     }
 
+    @Test
+    fun generateInputWithDefaultValueForComplexType() {
+        val schema = """
+            enum Color {
+                red
+            }
+            
+            input ColorFilter {
+                color: Color = red
+            }
+            
+            input Car {
+                color: Color = red
+                make: String
+            }
+            
+            input MyCar {
+                car: Car = {color: red}
+            }
+        """.trimIndent()
+
+        val (dataTypes, _, enumTypes) = CodeGen(CodeGenConfig(schemas = setOf(schema), packageName = basePackageName)).generate()
+
+        assertCompilesJava(enumTypes + dataTypes)
+    }
+
     @Test
     fun generateInputWithDefaultValueForArray() {
         val schema = """