minor refactoring

lib/sequelize.js

@@ -26,7 +26,7 @@ module.exports = (function() {
 
 
     var ConnectorManager = require("./dialects/" + this.options.dialect + "/connector-manager")
     var ConnectorManager = require("./dialects/" + this.options.dialect + "/connector-manager")
 
 
-    this.modelManager = new ModelManager(this)
+    this.modelManager     = new ModelManager(this)
     this.connectorManager = new ConnectorManager(this, this.config)
     this.connectorManager = new ConnectorManager(this, this.config)
   }
   }
 
 
@@ -38,6 +38,15 @@ module.exports = (function() {
     return this.queryInterface
     return this.queryInterface
   }
   }
 
 
+  Sequelize.prototype.getMigrator = function(options, force) {
+    if(force)
+      this.migrator = new Migrator(this, options)
+    else
+      this.migrator = this.migrator || new Migrator(this, options)
+
+    return this.migrator
+  }
+
   Sequelize.prototype.define = function(modelName, attributes, options) {
   Sequelize.prototype.define = function(modelName, attributes, options) {
     options = options || {}
     options = options || {}
 
 
@@ -57,7 +66,7 @@ module.exports = (function() {
   }
   }
 
 
   Sequelize.prototype.migrate = function(options) {
   Sequelize.prototype.migrate = function(options) {
-    new Migrator(this, options).migrate()
+    this.getMigrator().migrate(options)
   }
   }
 
 
   Sequelize.prototype.query = function(sql, callee, options) {
   Sequelize.prototype.query = function(sql, callee, options) {