Add checkFieldAndIndex for table status (#228)

Author: Sakib Hasan

lib/migration.js

@@ -11,6 +11,12 @@ var async = require('async');
 module.exports = mixinMigration;
 
 function mixinMigration(PostgreSQL) {
+  PostgreSQL.prototype.checkFieldAndIndex = function(fields, indexes) {
+    if (fields && indexes)
+      return true;
+    return false;
+  };
+
   PostgreSQL.prototype.showFields = function(model, cb) {
     var sql = 'SELECT column_name AS "column", data_type AS "type", ' +
     'is_nullable AS "nullable", character_maximum_length as "length"' // , data_default AS "Default"'