issue swagger-api#1347

This is a fix to support enums in query parameters. Enum-related information was not being stored on `CodegenParameter` previously; it is now. Test cases have been added to make sure that the enum information is being properly processed from the model.

modules/swagger-codegen/src/main/java/io/swagger/codegen/CodegenParameter.java

@@ -9,11 +9,12 @@ public class CodegenParameter {
     public Boolean isFormParam, isQueryParam, isPathParam, isHeaderParam,
             isCookieParam, isBodyParam, isFile, notFile, hasMore, isContainer, 
             secondaryParam, isBinary, isCollectionFormatMulti;
-    public String baseName, paramName, dataType, collectionFormat, description, baseType, defaultValue;
+    public String baseName, paramName, dataType, datatypeWithEnum, collectionFormat, description, baseType, defaultValue;
     public String jsonSchema;
     public boolean isEnum;
     public List<String> _enum;
     public Map<String, Object> allowableValues;
+    public CodegenProperty items;
     public Map<String, Object> vendorExtensions;
 
     /**
@@ -78,6 +79,7 @@ public CodegenParameter copy() {
         output.baseName = this.baseName;
         output.paramName = this.paramName;
         output.dataType = this.dataType;
+        output.datatypeWithEnum = this.datatypeWithEnum;
         output.collectionFormat = this.collectionFormat;
         output.isCollectionFormatMulti = this.isCollectionFormatMulti;
         output.description = this.description;
@@ -109,6 +111,9 @@ public CodegenParameter copy() {
         if (this.allowableValues != null) {
             output.allowableValues = new HashMap<String, Object>(this.allowableValues);
         }
+        if (this.items != null) {
+            output.items = this.items;
+        }
         output.vendorExtensions = this.vendorExtensions;
         output.isBinary = this.isBinary;
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java

@@ -1607,9 +1607,16 @@ public CodegenParameter fromParameter(Parameter param, Set<String> imports) {
             property.setRequired(param.getRequired());
             CodegenProperty model = fromProperty(qp.getName(), property);
             p.dataType = model.datatype;
+            if(model.isEnum) {
+                p.datatypeWithEnum = model.datatypeWithEnum;
+            }
             p.isEnum = model.isEnum;
             p._enum = model._enum;
             p.allowableValues = model.allowableValues;
+            if(model.items != null && model.items.isEnum) {
+                p.datatypeWithEnum = model.datatypeWithEnum;
+                p.items = model.items;
+            }
             p.collectionFormat = collectionFormat;
             if(collectionFormat != null && collectionFormat.equals("multi")) {
                 p.isCollectionFormatMulti = true;

modules/swagger-codegen/src/test/java/io/swagger/codegen/CodegenTest.java

@@ -81,6 +81,40 @@ public void formParamTest() {
         Assert.assertNull(statusParam.hasMore);
     }
 
+    @Test(description = "handle enum array in query parameter test")
+    public void enumArrayQueryParameterTest() {
+        final Swagger model = parseAndPrepareSwagger("src/test/resources/2_0/petstore.json");
+        final DefaultCodegen codegen = new DefaultCodegen();
+        final String path = "/pet/findByStatus";
+        final Operation p = model.getPaths().get(path).getGet();
+        final CodegenOperation op = codegen.fromOperation(path, "get", p, model.getDefinitions());
+
+        Assert.assertEquals(op.queryParams.size(), 1);
+
+        final CodegenParameter statusParam = op.queryParams.get(0);
+        Assert.assertEquals(statusParam.items.datatypeWithEnum, "StatusEnum");
+        Assert.assertNotNull(statusParam.items);
+        Assert.assertTrue(statusParam.items.isEnum);
+        Assert.assertEquals(statusParam.items._enum.size(), 3);
+    }
+
+    @Test(description = "handle enum in query parameter test")
+    public void enumQueryParameterTest() {
+        final Swagger model = parseAndPrepareSwagger("src/test/resources/2_0/petstore.json");
+        final DefaultCodegen codegen = new DefaultCodegen();
+        final String path = "/store/findByStatus";
+        final Operation p = model.getPaths().get(path).getGet();
+        final CodegenOperation op = codegen.fromOperation(path, "get", p, model.getDefinitions());
+
+        Assert.assertEquals(op.queryParams.size(), 1);
+
+        final CodegenParameter statusParam = op.queryParams.get(0);
+        Assert.assertEquals(statusParam.datatypeWithEnum, "StatusEnum");
+        Assert.assertTrue(statusParam.isEnum);
+        Assert.assertEquals(statusParam._enum.size(), 3);
+    }
+
+
     @Test(description = "handle required parameters from a 2.0 spec as required when figuring out Swagger types")
     public void requiredParametersTest() {
         final Swagger model = parseAndPrepareSwagger("src/test/resources/2_0/requiredTest.json");

modules/swagger-codegen/src/test/resources/2_0/petstore.json

@@ -156,7 +156,7 @@
           "pet"
         ],
         "summary": "Finds Pets by status",
-        "description": "Multiple status values can be provided with comma seperated strings",
+        "description": "Multiple status values can be provided with comma separated strings",
         "operationId": "findPetsByStatus",
         "produces": [
           "application/json",
@@ -166,13 +166,23 @@
           {
             "name": "status",
             "in": "query",
-            "description": "Status values that need to be considered for filter",
+            "description": "Status values that need to be considered for query",
             "required": false,
             "type": "array",
             "items": {
-              "type": "string"
+              "type": "string",
+              "enum": [
+                "available",
+                "pending",
+                "sold"
+              ]
             },
             "collectionFormat": "multi",
+            "enum": [
+              "available",
+              "pending",
+              "sold"
+            ],
             "default": "available"
           }
         ],
@@ -567,6 +577,55 @@
           }
         ]
       }
+    },
+     "/store/findByStatus": {
+      "get": {
+        "tags": [
+          "store"
+        ],
+        "summary": "Finds orders by status",
+        "description": "A single status value can be provided as a string",
+        "operationId": "findOrdersByStatus",
+        "produces": [
+          "application/json",
+          "application/xml"
+        ],
+        "parameters": [
+          {
+            "name": "status",
+            "in": "query",
+            "description": "Status value that needs to be considered for query",
+            "required": false,
+            "type": "string",
+            "enum": [
+              "placed",
+              "approved",
+              "delivered"
+            ],
+            "default": "placed"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "successful operation",
+            "schema": {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/Order"
+              }
+            }
+          },
+          "400": {
+            "description": "Invalid status value"
+          }
+        },
+        "security": [
+          {
+            "test_api_client_id": [],
+            "test_api_client_secret": []
+          }
+        ]
+      }
     },
     "/store/order/{orderId}": {
       "get": {