add generate unmarshal json option in go client generator

Author: wing328

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConstants.java

@@ -442,6 +442,8 @@ public static enum ENUM_PROPERTY_NAMING_TYPE {camelCase, PascalCase, snake_case,
     public static final String GENERATE_MARSHAL_JSON = "generateMarshalJSON";
     public static final String GENERATE_MARSHAL_JSON_DESC = "Generate MarshalJSON method";
 
+    public static final String GENERATE_UNMARSHAL_JSON = "generateUnmarshalJSON";
+    public static final String GENERATE_UNMARSHAL_JSON_DESC = "Generate UnmarshalJSON method";
     public static final String MAX_ATTEMPTS_FOR_RETRY = "maxAttemptsForRetry";
 
     public static final String WAIT_TIME_OF_THREAD = "waitTimeMillis";

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java

@@ -48,6 +48,8 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
     protected boolean generateInterfaces = false;
     protected boolean withGoMod = false;
     protected boolean generateMarshalJSON = true;
+    protected boolean generateUnmarshalJSON = true;
+
 
     protected String packageName = "openapi";
     protected Set<String> numberTypes;
@@ -775,11 +777,11 @@ public ModelsMap postProcessModels(ModelsMap objs) {
             }
 
             if (generateMarshalJSON) {
-                model.vendorExtensions.put("x-go-generate-marshal-json", true);
+                model.vendorExtensions.putIfAbsent("x-go-generate-marshal-json", true);
             }
 
-            if (!model.vendorExtensions.containsKey("x-go-generate-unmarshal-json")) {
-                model.vendorExtensions.put("x-go-generate-unmarshal-json", true);
+            if (generateUnmarshalJSON) {
+                model.vendorExtensions.putIfAbsent("x-go-generate-unmarshal-json", true);
             }
         }
 
@@ -936,6 +938,10 @@ public void setGenerateMarshalJSON(boolean generateMarshalJSON) {
         this.generateMarshalJSON = generateMarshalJSON;
     }
 
+    public void setGenerateUnmarshalJSON(boolean generateUnmarshalJSON) {
+        this.generateUnmarshalJSON = generateUnmarshalJSON;
+    }
+
     @Override
     public String toDefaultValue(Schema schema) {
         schema = unaliasSchema(schema);

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/GoClientCodegen.java

@@ -150,6 +150,7 @@ public GoClientCodegen() {
         this.setDisallowAdditionalPropertiesIfNotPresent(true);
         cliOptions.add(CliOption.newBoolean(WITH_GO_MOD, "Generate go.mod and go.sum", true));
         cliOptions.add(CliOption.newBoolean(CodegenConstants.GENERATE_MARSHAL_JSON, CodegenConstants.GENERATE_MARSHAL_JSON_DESC, true));
+        cliOptions.add(CliOption.newBoolean(CodegenConstants.GENERATE_UNMARSHAL_JSON, CodegenConstants.GENERATE_UNMARSHAL_JSON_DESC, true));
         this.setWithGoMod(true);
     }
 
@@ -287,6 +288,11 @@ public void processOpts() {
             setGenerateMarshalJSON(Boolean.parseBoolean(additionalProperties.get(CodegenConstants.GENERATE_MARSHAL_JSON).toString()));
         }
 
+        if (additionalProperties.containsKey(CodegenConstants.GENERATE_UNMARSHAL_JSON)) {
+            setGenerateUnmarshalJSON(Boolean.parseBoolean(additionalProperties.get(CodegenConstants.GENERATE_UNMARSHAL_JSON).toString()));
+        }
+
+
         // add lambda for mustache templates to handle oneOf/anyOf naming
         // e.g. []string => ArrayOfString
         additionalProperties.put("lambda.type-to-name", (Mustache.Lambda) (fragment, writer) -> writer.write(typeToName(fragment.execute())));

modules/openapi-generator/src/test/java/org/openapitools/codegen/go/GoClientOptionsTest.java

@@ -53,5 +53,6 @@ protected void verifyOptions() {
         verify(clientCodegen).setUseOneOfDiscriminatorLookup(GoClientOptionsProvider.USE_ONE_OF_DISCRIMINATOR_LOOKUP_VALUE);
         verify(clientCodegen).setWithGoMod(GoClientOptionsProvider.WITH_GO_MOD_VALUE);
         verify(clientCodegen).setGenerateMarshalJSON(GoClientOptionsProvider.GENERATE_MARSHAL_JSON_VALUE);
+        verify(clientCodegen).setGenerateUnmarshalJSON(GoClientOptionsProvider.GENERATE_UNMARSHAL_JSON_VALUE);
     }
 }

modules/openapi-generator/src/test/java/org/openapitools/codegen/options/GoClientOptionsProvider.java

@@ -38,6 +38,7 @@ public class GoClientOptionsProvider implements OptionsProvider {
     public static final boolean USE_ONE_OF_DISCRIMINATOR_LOOKUP_VALUE = true;
     public static final boolean WITH_GO_MOD_VALUE = true;
     public static final boolean GENERATE_MARSHAL_JSON_VALUE = true;
+    public static final boolean GENERATE_UNMARSHAL_JSON_VALUE = true;
 
     @Override
     public String getLanguage() {
@@ -60,6 +61,7 @@ public Map<String, String> createOptions() {
                 .put(CodegenConstants.USE_ONEOF_DISCRIMINATOR_LOOKUP, "true")
                 .put(CodegenConstants.WITH_GO_MOD, "true")
                 .put(CodegenConstants.GENERATE_MARSHAL_JSON, "true")
+                .put(CodegenConstants.GENERATE_UNMARSHAL_JSON, "true")
                 .put("generateInterfaces", "true")
                 .put("structPrefix", "true")
                 .build();