[Python] Add enum support when building default values for model properties when using $ref

bin/configs/python-flask.yaml

@@ -1,4 +1,4 @@
 generatorName: python-flask
 outputDir: samples/server/petstore/python-flask
-inputSpec: modules/openapi-generator/src/test/resources/2_0/python-flask/petstore.yaml
+inputSpec: modules/openapi-generator/src/test/resources/3_0/python-flask/petstore.yaml
 templateDir: modules/openapi-generator/src/main/resources/python-flask

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

@@ -923,6 +923,18 @@ public String toEnumDefaultValue(String value, String datatype) {
         return datatype + "." + value;
     }
 
+    /**
+     * Return the enum default value in the language specified format
+     *
+     * @param property  The codegen property to create the default for.
+     * @param value     Enum variable name
+     * @return the default value for the enum
+     */
+    public String toEnumDefaultValue(CodegenProperty property, String value) {
+        // Use the datatype with the value.
+        return toEnumDefaultValue(value, property.datatypeWithEnum);
+    }
+
     /**
      * Return the enum value in the language specified format
      * e.g. status becomes "status"
@@ -6645,7 +6657,7 @@ public void updateCodegenPropertyEnum(CodegenProperty var) {
                 }
             }
             if (enumName != null) {
-                var.defaultValue = toEnumDefaultValue(enumName, var.datatypeWithEnum);
+                var.defaultValue = toEnumDefaultValue(var, enumName);
             }
         }
     }

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

@@ -198,6 +198,18 @@ public String escapeReservedWord(String name) {
      */
     @Override
     public String toDefaultValue(Schema p) {
+        // If the Schema is a $ref, get the default value from the reference.
+        String ref = ModelUtils.getSimpleRef(p.get$ref());
+        if (ref != null) {
+            Schema referencedSchema = ModelUtils.getSchemas(this.openAPI).get(ref);
+            if (referencedSchema != null) {
+                String defaultValue = toDefaultValue(referencedSchema);
+                if (defaultValue != null) {
+                    return defaultValue;
+                }
+                // No default was found for the $ref, so see if one has been defined locally.
+            }
+        }
         if (ModelUtils.isBooleanSchema(p)) {
             if (p.getDefault() != null) {
                 if (!Boolean.valueOf(p.getDefault().toString()))
@@ -217,6 +229,14 @@ public String toDefaultValue(Schema p) {
             if (p.getDefault() != null) {
                 return p.getDefault().toString();
             }
+        } else if (ModelUtils.isEnumSchema(p)) {
+            // Enum must come before string to use enum reference!
+            if (p.getDefault() != null) {
+                String defaultValue = String.valueOf(p.getDefault());
+                if (defaultValue != null) {
+                    return defaultValue;
+                }
+            }
         } else if (ModelUtils.isStringSchema(p)) {
             if (p.getDefault() != null) {
                 String defaultValue = String.valueOf(p.getDefault());
@@ -237,7 +257,6 @@ public String toDefaultValue(Schema p) {
                 return null;
             }
         }
-
         return null;
     }
 
@@ -1085,7 +1104,9 @@ public String toEnumVariableName(String name, String datatype) {
         }
 
         // remove quote e.g. 'abc' => abc
-        name = name.substring(1, name.length() - 1);
+        if (name.startsWith("'") && name.endsWith("'")) {
+            name = name.substring(1, name.length() - 1);
+        }
 
         if (name.length() == 0) {
             return "EMPTY";
@@ -1396,7 +1417,13 @@ public String toEnumValue(String value, String datatype) {
     }
 
     @Override
-    public String toEnumDefaultValue(String value, String datatype) {
+    public String toEnumDefaultValue(CodegenProperty property, String value) {
+        if (property.isEnumRef) {
+            // Determine if it's a string by checking if the value has already been encapsulated in single quotes.
+            String dataType = (value.startsWith("'") && value.endsWith("'")) ? "string" : "int";
+            // If the property is an enum reference, then use the fully qualified name with the data type.
+            return property.dataType + "." + toEnumVariableName(value, dataType);
+        }
         return value;
     }
 

modules/openapi-generator/src/main/resources/python-fastapi/model_generic.mustache

@@ -351,7 +351,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             "{{{baseName}}}": {{{dataType}}}.from_dict(obj.get("{{{baseName}}}")) if obj.get("{{{baseName}}}") is not None else None{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{#isEnumOrRef}}
-            "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
+            "{{{baseName}}}": obj.get("{{{baseName}}}"){{#defaultValue}} if obj.get("{{baseName}}") is not None else {{defaultValue}}{{/defaultValue}}{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{/isPrimitiveType}}
             {{#isPrimitiveType}}

modules/openapi-generator/src/main/resources/python-pydantic-v1/model_generic.mustache

@@ -343,7 +343,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             "{{{name}}}": {{{dataType}}}.from_dict(obj.get("{{{baseName}}}")) if obj.get("{{{baseName}}}") is not None else None{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{#isEnumOrRef}}
-            "{{{name}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
+            "{{{name}}}": obj.get("{{{baseName}}}"){{#defaultValue}} if obj.get("{{baseName}}") is not None else {{defaultValue}}{{/defaultValue}}{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{/isPrimitiveType}}
             {{#isPrimitiveType}}

modules/openapi-generator/src/main/resources/python/model_generic.mustache

@@ -363,7 +363,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             "{{{baseName}}}": {{{dataType}}}.from_dict(obj["{{{baseName}}}"]) if obj.get("{{{baseName}}}") is not None else None{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{#isEnumOrRef}}
-            "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
+            "{{{baseName}}}": obj.get("{{{baseName}}}"){{#defaultValue}} if obj.get("{{baseName}}") is not None else {{defaultValue}}{{/defaultValue}}{{^-last}},{{/-last}}
             {{/isEnumOrRef}}
             {{/isPrimitiveType}}
             {{#isPrimitiveType}}