dropAllTables now accepts an options object

If this object contains a propert called `skip` that is an array,
then all table names in this array wont be dropped

lib/dialects/sqlite/query-interface.js

@@ -120,9 +120,15 @@ var QueryInterface = module.exports = {
       }.bind(this))
   },
 
-  dropAllTables: function(tablesToSkip) {
+  dropAllTables: function(options) {
     var self = this
 
+    if (!options) {
+      options = {}
+    }
+
+    var skip = options.skip || [];
+
    return new Utils.CustomEventEmitter(function(dropAllTablesEmitter) {
       var events  = []
         , chainer = new Utils.QueryChainer()
@@ -150,7 +156,7 @@ var QueryInterface = module.exports = {
 
                 tableNames.forEach(function(tableName) {
                   // if tableName is not in the Array of tables names then dont drop it
-                  if (tablesToSkip.indexOf(tableName) == -1) {
+                  if (skip.indexOf(tableName) == -1) {
                     queries.push(self.QueryGenerator.dropTableQuery(tableName).replace(';', ''))
                   }
                 })

lib/query-interface.js

@@ -234,15 +234,18 @@ module.exports = (function() {
     }).run()
   }
 
-  QueryInterface.prototype.dropAllTables = function(tablesToSkip) {
+  QueryInterface.prototype.dropAllTables = function(options) {
     var self = this
-    if (!tablesToSkip) {
-      tablesToSkip = [];
+
+    if (!options) {
+      options = {}
     }
 
+    var skip = options.skip || [];
+
     if (this.sequelize.options.dialect === 'sqlite') {
       // sqlite needs some special treatment as it cannot drop a column
-      return SQLiteQueryInterface.dropAllTables.call(this, tablesToSkip)
+      return SQLiteQueryInterface.dropAllTables.call(this, options)
     } else {
       return new Utils.CustomEventEmitter(function(dropAllTablesEmitter) {
         var events  = []
@@ -266,7 +269,7 @@ module.exports = (function() {
             // add the table removal query to the chainer
             tableNames.forEach(function(tableName) {
               // if tableName is not in the Array of tables names then dont drop it
-              if (tablesToSkip.indexOf(tableName) == -1) {
+              if (skip.indexOf(tableName) == -1) {
                 chainer.add(self, 'dropTable', [ tableName, { cascade: true } ])
               }
             })

test/query-interface.test.js

@@ -51,7 +51,7 @@ describe(Support.getTestDialectTeaser("QueryInterface"), function () {
       self.queryInterface.createTable('skipme', {
         name: DataTypes.STRING,
       }).success(function() {
-        self.queryInterface.dropAllTables(['skipme']).complete(function(err){
+        self.queryInterface.dropAllTables({skip: ['skipme']}).complete(function(err){
           expect(err).to.be.null
           
           self.queryInterface.showAllTables().complete(function(err, tableNames) {