feat: fix duplicated classes in packages and duplicated properties in constructors from interfaces (#2051) (#2052)

### 🔗 Related Issues
#2050

---------

Co-authored-by: Samuel Vazquez <[email protected]>

Author: samuelAndalon

plugins/client/graphql-kotlin-client-generator/src/main/kotlin/com/expediagroup/graphql/plugin/client/generator/GraphQLClientGenerator.kt

@@ -179,13 +179,21 @@ class GraphQLClientGenerator(
             operationTypeSpec.addType(graphQLResponseTypeSpec)
 
             val polymorphicTypes = mutableListOf<ClassName>()
+            // prevent colocating duplicated type specs in the same packageName
+            val typeSpecByPackageName = mutableSetOf<String>()
             for ((superClassName, implementations) in context.polymorphicTypes) {
                 polymorphicTypes.add(superClassName)
                 val polymorphicTypeSpec = FileSpec.builder(superClassName.packageName, superClassName.simpleName)
                 for (implementation in implementations) {
                     polymorphicTypes.add(implementation)
                     context.typeSpecs[implementation]?.let { typeSpec ->
-                        polymorphicTypeSpec.addType(typeSpec)
+                        if (
+                            typeSpec.name != null &&
+                            !typeSpecByPackageName.contains("${superClassName.packageName}.${typeSpec.name}")
+                        ) {
+                            polymorphicTypeSpec.addType(typeSpec)
+                            typeSpecByPackageName.add("${superClassName.packageName}.${typeSpec.name}")
+                        }
                     }
                 }
                 fileSpecs.add(polymorphicTypeSpec.build())

plugins/client/graphql-kotlin-client-generator/src/main/kotlin/com/expediagroup/graphql/plugin/client/generator/types/generateInterfaceTypeSpec.kt

@@ -213,7 +213,11 @@ private fun updateImplementationTypeSpecWithSuperInformation(
             } else {
                 property
             }
-            builder.addProperty(updatedProperty)
+
+            // add the property to the type builder only if the property was actually uptaded.
+            if (updatedProperty != property) {
+                builder.addProperty(updatedProperty)
+            }
             constructor.addParameter(updatedProperty.name, updatedProperty.type)
         }
         builder.primaryConstructor(constructor.build())

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/UnionSameSelections.graphql

@@ -0,0 +1,25 @@
+query UnionSameSelections {
+  message1 {
+    __typename
+    ... on ProductRatingLink {
+      link {
+        text
+      }
+      action {
+        text
+      }
+    }
+    ... on EGDSPlainText {
+      text
+    }
+  }
+  message2 {
+    __typename
+    ... on EGDSParagraph {
+      text
+    }
+    ... on EGDSPlainText {
+      text
+    }
+  }
+}

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/UnionSameSelections.kt

@@ -0,0 +1,28 @@
+package com.expediagroup.graphql.generated
+
+import com.expediagroup.graphql.client.Generated
+import com.expediagroup.graphql.client.types.GraphQLClientRequest
+import com.expediagroup.graphql.generated.unionsameselections.ProductRatingSupportingMessage
+import com.expediagroup.graphql.generated.unionsameselections.ProductSupportingMessage
+import kotlin.String
+import kotlin.collections.List
+import kotlin.reflect.KClass
+
+public const val UNION_SAME_SELECTIONS: String =
+    "query UnionSameSelections {\n  message1 {\n    __typename\n    ... on ProductRatingLink {\n      link {\n        text\n      }\n      action {\n        text\n      }\n    }\n    ... on EGDSPlainText {\n      text\n    }\n  }\n  message2 {\n    __typename\n    ... on EGDSParagraph {\n      text\n    }\n    ... on EGDSPlainText {\n      text\n    }\n  }\n}"
+
+@Generated
+public class UnionSameSelections : GraphQLClientRequest<UnionSameSelections.Result> {
+  override val query: String = UNION_SAME_SELECTIONS
+
+  override val operationName: String = "UnionSameSelections"
+
+  override fun responseType(): KClass<UnionSameSelections.Result> =
+      UnionSameSelections.Result::class
+
+  @Generated
+  public data class Result(
+    public val message1: List<ProductRatingSupportingMessage>,
+    public val message2: List<ProductSupportingMessage>,
+  )
+}

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/unionsameselections/EGDSProductRatingShowTextAction.kt

@@ -0,0 +1,9 @@
+package com.expediagroup.graphql.generated.unionsameselections
+
+import com.expediagroup.graphql.client.Generated
+import kotlin.String
+
+@Generated
+public data class EGDSProductRatingShowTextAction(
+  public val text: String,
+)

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/unionsameselections/EGDSStandardLink.kt

@@ -0,0 +1,9 @@
+package com.expediagroup.graphql.generated.unionsameselections
+
+import com.expediagroup.graphql.client.Generated
+import kotlin.String
+
+@Generated
+public data class EGDSStandardLink(
+  public val text: String,
+)

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/unionsameselections/ProductRatingSupportingMessage.kt

@@ -0,0 +1,39 @@
+package com.expediagroup.graphql.generated.unionsameselections
+
+import com.expediagroup.graphql.client.Generated
+import com.fasterxml.jackson.`annotation`.JsonSubTypes
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo.As.PROPERTY
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo.Id.NAME
+import kotlin.String
+
+@Generated
+@JsonTypeInfo(
+  use = JsonTypeInfo.Id.NAME,
+  include = JsonTypeInfo.As.PROPERTY,
+  property = "__typename",
+  defaultImpl = DefaultProductRatingSupportingMessageImplementation::class,
+)
+@JsonSubTypes(value = [com.fasterxml.jackson.annotation.JsonSubTypes.Type(value =
+    ProductRatingLink::class,
+    name="ProductRatingLink"),com.fasterxml.jackson.annotation.JsonSubTypes.Type(value =
+    EGDSPlainText::class, name="EGDSPlainText")])
+public interface ProductRatingSupportingMessage
+
+@Generated
+public data class ProductRatingLink(
+  public val link: EGDSStandardLink,
+  public val action: EGDSProductRatingShowTextAction,
+) : ProductRatingSupportingMessage
+
+@Generated
+public data class EGDSPlainText(
+  public val text: String,
+) : ProductRatingSupportingMessage, ProductSupportingMessage
+
+/**
+ * Fallback ProductRatingSupportingMessage implementation that will be used when unknown/unhandled
+ * type is encountered.
+ */
+@Generated
+public class DefaultProductRatingSupportingMessageImplementation() : ProductRatingSupportingMessage

plugins/client/graphql-kotlin-client-generator/src/test/data/generator/union_same_selections/unionsameselections/ProductSupportingMessage.kt

@@ -0,0 +1,33 @@
+package com.expediagroup.graphql.generated.unionsameselections
+
+import com.expediagroup.graphql.client.Generated
+import com.fasterxml.jackson.`annotation`.JsonSubTypes
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo.As.PROPERTY
+import com.fasterxml.jackson.`annotation`.JsonTypeInfo.Id.NAME
+import kotlin.String
+
+@Generated
+@JsonTypeInfo(
+  use = JsonTypeInfo.Id.NAME,
+  include = JsonTypeInfo.As.PROPERTY,
+  property = "__typename",
+  defaultImpl = DefaultProductSupportingMessageImplementation::class,
+)
+@JsonSubTypes(value = [com.fasterxml.jackson.annotation.JsonSubTypes.Type(value =
+    EGDSParagraph::class,
+    name="EGDSParagraph"),com.fasterxml.jackson.annotation.JsonSubTypes.Type(value =
+    EGDSPlainText::class, name="EGDSPlainText")])
+public interface ProductSupportingMessage
+
+@Generated
+public data class EGDSParagraph(
+  public val text: String,
+) : ProductSupportingMessage
+
+/**
+ * Fallback ProductSupportingMessage implementation that will be used when unknown/unhandled type is
+ * encountered.
+ */
+@Generated
+public class DefaultProductSupportingMessageImplementation() : ProductSupportingMessage

plugins/client/graphql-kotlin-client-generator/src/test/resources/testSchema.graphql

@@ -112,6 +112,8 @@ type Query {
   unionQuery: BasicUnion!
   "Query to test doc strings"
   docQuery: DocObject!
+  message1: [ProductRatingSupportingMessage!]!
+  message2: [ProductSupportingMessage!]!
 }
 "Wrapper that holds all supported scalar types"
 type ScalarWrapper {
@@ -213,3 +215,26 @@ input ScalarWrapperInput {
     "List of custom scalar Locales"
     listLocale: [Locale!]!
 }
+
+interface EGDSText {
+    text: String!
+}
+type EGDSPlainText implements EGDSText {
+    text: String!
+}
+type ProductRatingLink {
+    action: EGDSProductRatingShowTextAction!
+    link: EGDSStandardLink!
+}
+type EGDSProductRatingShowTextAction {
+    text: String!
+}
+type EGDSStandardLink implements EGDSText {
+    text: String!
+}
+union ProductRatingSupportingMessage = EGDSPlainText | ProductRatingLink
+union ProductSupportingMessage = EGDSParagraph | EGDSPlainText
+
+type EGDSParagraph implements EGDSText {
+    text: String!
+}