Avoid tags duplication

lib/swagger-helpers.js

@@ -3,6 +3,32 @@
 // Dependencies.
 var RecursiveIterator = require('recursive-iterator');
 
+/**
+ * Checks if tag is already contained withing target.
+ * The tag is an object of type http://swagger.io/specification/#tagObject
+ * The target, is the part of the swagger specification that holds all tags.
+ * @function
+ * @param {object} target - Swagger object place to include the tags data.
+ * @param {object} tag - Swagger tag object to be included.
+ * @returns {boolean} Does tag is already present in target
+ */
+function _tagDuplicated(target, tag) {
+  // Check input is workable.
+  if (target && target.length && tag) {
+    for (var i = 0; i < target.length; i = i + 1) {
+      var targetTag = target[i];
+      // The name of the tag to include already exists in the taget.
+      // Therefore, it's not necessary to be added again.
+      if (targetTag.name === tag.name) {
+        return true;
+      }
+    }
+  }
+
+  // This will indicate that `tag` is not present in `target`.
+  return false;
+}
+
 /**
  * Adds the tags property to a swagger object.
  * @function
@@ -20,10 +46,14 @@ function _attachTags(conf) {
 
   if (Array.isArray(tag)) {
     for (var i = 0; i < tag.length; i = i + 1) {
-      swaggerObject[propertyName].push(tag[i]);
+      if (!_tagDuplicated(swaggerObject[propertyName], tag[i])) {
+        swaggerObject[propertyName].push(tag[i]);
+      }
     }
   } else {
-    swaggerObject[propertyName].push(tag);
+    if (!_tagDuplicated(swaggerObject[propertyName], tag)) {
+      swaggerObject[propertyName].push(tag);
+    }
   }
 }