Make cascade optional

lib/dialects/postgres/query-generator.js

@@ -78,9 +78,10 @@ module.exports = (function() {
 
     dropTableQuery: function(tableName, options) {
       options = options || {}
-      var query = "DROP TABLE IF EXISTS <%= table %> CASCADE;"
+      var query = "DROP TABLE IF EXISTS <%= table %><%= cascade %>;"
       return Utils._.template(query)({
-        table: QueryGenerator.addQuotes(tableName)
+        table: QueryGenerator.addQuotes(tableName),
+        cascade: options.cascade? " CASCADE" : ""
       })
     },
 

lib/query-interface.js

@@ -79,8 +79,8 @@ module.exports = (function() {
     return queryAndEmit.call(this, sql, 'createTable')
   }
 
-  QueryInterface.prototype.dropTable = function(tableName) {
-    var sql = this.QueryGenerator.dropTableQuery(tableName)
+  QueryInterface.prototype.dropTable = function(tableName, options) {
+    var sql = this.QueryGenerator.dropTableQuery(tableName, options)
     return queryAndEmit.call(this, sql, 'dropTable')
   }
 
@@ -95,7 +95,7 @@ module.exports = (function() {
         chainer.add(self, 'disableForeignKeyConstraints', [])
 
         tableNames.forEach(function(tableName) {
-          chainer.add(self, 'dropTable', [tableName])
+          chainer.add(self, 'dropTable', [tableName, {cascade: true}])
         })
 
         chainer.add(self, 'enableForeignKeyConstraints', [])

spec-jasmine/postgres/query-generator.spec.js

@@ -95,11 +95,11 @@ describe('QueryGenerator', function() {
 
     dropTableQuery: [
       {
-        arguments: ['myTable'],
+        arguments: ['myTable', {cascade: true}],
         expectation: "DROP TABLE IF EXISTS \"myTable\" CASCADE;"
       },
       {
-        arguments: ['mySchema.myTable'],
+        arguments: ['mySchema.myTable', {cascade: true}],
         expectation: "DROP TABLE IF EXISTS \"mySchema\".\"myTable\" CASCADE;"
       }
     ],