dont add id as primary key if primaryKeys were defined for the model

lib/sequelize/model-definition.js

@@ -21,6 +21,9 @@ ModelDefinition.prototype.addDefaultAttributes = function() {
   var defaultAttributes = {id: {type: DataTypes.INTEGER, allowNull: false, primaryKey: true, autoIncrement: true}}
     , self = this
 
+  if(Utils._.keys(this.primaryKeys).length > 0)
+    defaultAttributes = {}
+  
   if(this.options.timestamps) {
     defaultAttributes[this.options.camelcase ? 'created_at' : 'createdAt'] = {type: DataTypes.DATE, allowNull: false}
     defaultAttributes[this.options.camelcase ? 'updated_at' : 'updatedAt'] = {type: DataTypes.DATE, allowNull: false}
@@ -74,6 +77,9 @@ ModelDefinition.prototype.find = function(options) {
   // options is not a hash but an id
   if(typeof options == 'number')
     options = {where: options}
+  else {
+    // if(arguments.length == this.primaryKeys.length)
+  }
   
   options.limit = 1
   
@@ -94,4 +100,15 @@ ModelDefinition.prototype.create = function(values) {
   return this.build(values).save()
 }
 
+ModelDefinition.prototype.__defineGetter__('primaryKeys', function() {
+  var result = {}
+  
+  Utils._.each(this.attributes, function(dataTypeString, attributeName) {
+    if(dataTypeString.indexOf('PRIMARY KEY') > -1)
+      result[attributeName] = dataTypeString
+  })
+  
+  return result
+})
+
 Utils._.map(require("./association-mixin").classMethods, function(fct, name) { ModelDefinition.prototype[name] = fct })
\ No newline at end of file

test/Sequelize/define.js

@@ -31,7 +31,14 @@ module.exports = {
     var User = sequelize.define('User' + parseInt(Math.random() * 999999999), {
       username: {type: Sequelize.STRING, primaryKey: true}
     }, { timestamps: false })
-    assert.eql(User.attributes, {username:"VARCHAR(255) PRIMARY KEY",id:"INT NOT NULL auto_increment PRIMARY KEY"})
+    assert.eql(User.attributes, {username:"VARCHAR(255) PRIMARY KEY"})
+  },
+  'primaryKeys should be correctly determined': function() {
+    var User = sequelize.define('User' + parseInt(Math.random() * 999999999), {
+      foo: {type: Sequelize.STRING, primaryKey: true},
+      bar: Sequelize.STRING
+    })
+    assert.eql(User.primaryKeys, {"foo":"VARCHAR(255) PRIMARY KEY"})
   },
   'it should add updatedAt and createdAt if timestamps is undefined or true': function() {
     var User1 = sequelize.define('User' + parseInt(Math.random() * 999999999), {})