added isDefined for sequelize

lib/sequelize.js

@@ -65,18 +65,21 @@ module.exports = (function() {
 
 
   Sequelize.prototype.define = function(daoName, attributes, options) {
   Sequelize.prototype.define = function(daoName, attributes, options) {
     options = options || {}
     options = options || {}
-
-    if(this.options.define)
+    if(this.options.define) {
       options = Sequelize.Utils.merge(options, this.options.define)
       options = Sequelize.Utils.merge(options, this.options.define)
+    }
     options.omitNull = this.options.omitNull
     options.omitNull = this.options.omitNull
 
 
     var factory = new DAOFactory(daoName, attributes, options)
     var factory = new DAOFactory(daoName, attributes, options)
-
     this.daoFactoryManager.addDAO(factory.init(this.daoFactoryManager))
     this.daoFactoryManager.addDAO(factory.init(this.daoFactoryManager))
-
     return factory
     return factory
   }
   }
 
 
+  Sequelize.prototype.isDefined = function(daoName) {
+    var daos = this.daoFactoryManager.daos
+    return (daos.filter(function(dao) { return dao.name === daoName }).length !== 0)
+  }
+
   Sequelize.prototype.import = function(path) {
   Sequelize.prototype.import = function(path) {
     if (!this.importCache[path]) {
     if (!this.importCache[path]) {
       var defineCall = require(path)
       var defineCall = require(path)

spec/sequelize.spec.js

@@ -20,4 +20,17 @@ describe('Sequelize', function() {
       expect(1).toEqual(1)
       expect(1).toEqual(1)
     })
     })
   })
   })
+
+  describe('isDefined', function() {
+    it("returns false if the dao wasn't defined before", function() {
+      expect(this.sequelize.isDefined('Project')).toBeFalse()
+    })
+
+    it("returns true if the dao was defined before", function() {
+      this.sequelize.define('Project', {
+        name: Helpers.Sequelize.STRING
+      })
+      expect(this.sequelize.isDefined('Project')).toBeTrue()
+    })
+  })
 })
 })