Add metaData function

Author: Pierre Watine

lib/serializer-utils.js

@@ -97,13 +97,17 @@ module.exports = function (collectionName, record, payload, opts) {
   }
 
   function getMeta(current, meta) {
-    return _mapValues(meta, function (value) {
-      if (isFunction(value)) {
-        return value(record, current);
-      } else {
-        return value;
-      }
-    });
+    if (isFunction(meta)) {
+        return meta(record);
+    } else {
+      return _mapValues(meta, function (value) {
+        if (isFunction(value)) {
+          return value(record, current);
+        } else {
+          return value;
+        }
+      });
+    }
   }
 
   function pick(obj, attributes) {

test/serializer.js

@@ -328,6 +328,27 @@ describe('Options', function () {
       expect(json.data[1].meta.count).equal(1);
       done(null, json);
     });
+
+    it('should set the meta according to the func return', function (done) {
+      var dataSet = [{
+        id: '54735750e16638ba1eee59cb',
+        firstName: 'Sandro',
+        lastName: 'Munda'
+      }, {
+        id: '5490143e69e49d0c8f9fc6bc',
+        firstName: 'Lawrence',
+        lastName: 'Bennett'
+      }];
+
+      var json = new JSONAPISerializer('user', {
+        attributes: ['firstName', 'lastName'],
+        dataMeta: function (record) { return { copyright: record.firstName + ' ' + record.lastName }; } 
+      }).serialize(dataSet);
+
+      expect(json.data[0].meta.copyright).equal("Sandro Munda");
+      expect(json.data[1].meta.copyright).equal("Lawrence Bennett");
+      done(null, json);
+    });
   });
 
   describe('included', function () {