fix the issue of inline-enum for array (#13250)

update doc

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

@@ -409,6 +409,30 @@ public class ScalaSttpClientCodegen extends AbstractScalaCodegen implements Code
         }
     }
 
+    /**
+     * Update datatypeWithEnum for array container
+     *
+     * @param property Codegen property
+     */
+    @Override
+    protected void updateDataTypeWithEnumForArray(CodegenProperty property) {
+        CodegenProperty baseItem = property.items;
+        while (baseItem != null && (Boolean.TRUE.equals(baseItem.isMap)
+                || Boolean.TRUE.equals(baseItem.isArray))) {
+            baseItem = baseItem.items;
+        }
+        if (baseItem != null) {
+            // set datetypeWithEnum as only the inner type is enum
+            property.datatypeWithEnum = toEnumName(baseItem);
+            // naming the enum with respect to the language enum naming convention
+            // e.g. remove [], {} from array/map of enum
+            property.enumName = toEnumName(property);
+            property._enum = baseItem._enum;
+
+            updateCodegenPropertyEnum(property);
+        }
+    }
+
     public static abstract class Property<T> {
         final String name;
         final String description;

modules/openapi-generator/src/main/resources/scala-sttp/model.mustache

@@ -21,7 +21,7 @@ case class {{classname}}(
   {{#description}}
   /* {{{.}}} */
   {{/description}}
-  {{{name}}}: {{^required}}Option[{{/required}}{{^isEnum}}{{dataType}}{{/isEnum}}{{#isEnum}}{{classname}}Enums.{{datatypeWithEnum}}{{/isEnum}}{{^required}}] = None{{/required}}{{^-last}},{{/-last}}
+  {{{name}}}: {{^required}}Option[{{/required}}{{^isEnum}}{{dataType}}{{/isEnum}}{{#isEnum}}{{^isArray}}{{classname}}Enums.{{datatypeWithEnum}}{{/isArray}}{{#isArray}}Seq[{{classname}}Enums.{{datatypeWithEnum}}]{{/isArray}}{{/isEnum}}{{^required}}] = None{{/required}}{{^-last}},{{/-last}}
   {{/vars}}
 )
 {{/isEnum}}