水线ORM外键错误

我完全是NodeJS的新手。 我试图build立我的第一个快速的应用程序与MySQL数据库。 我没有使用Sails，但是我读了一些使用Waterline ORM的build议。 不过，我在尝试初始化我的ORM时遇到了问题。 这是我在mysql中的数据库模式：

CREATE TABLE IF NOT EXISTS `c` ( `c_id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT, `d_id` int(11) UNSIGNED NOT NULL, `name` varchar(255) NOT NULL, PRIMARY KEY (`c_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `d` ( `d_id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT, `c_id` int(11) UNSIGNED NULL, `name` varchar(255) NOT NULL, PRIMARY KEY (`d_id`), CONSTRAINT `d_ibfk_1` FOREIGN KEY (`c_id`) REFERENCES `c`(`c_id`) ON DELETE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8; ALTER TABLE c ADD CONSTRAINT `c_ibfk_1` FOREIGN KEY (`d_id`) REFERENCES `d`(`d_id`) ON DELETE CASCADE; 

这是我的节点JS代码

 var express = require("express"); var app = express(); var Waterline = require("waterline"); //console.log(new homer()); var orm = new Waterline(); ////////////////////////////////////////////////////////////////// // WATERLINE CONFIG ////////////////////////////////////////////////////////////////// // Require any waterline compatible adapters here var diskAdapter = require('sails-disk'), mysqlAdapter = require('sails-mysql'); // Build A Config Object var config = { // Setup Adapters // Creates named adapters that have have been required adapters: { 'default': diskAdapter, disk: diskAdapter, mysql: mysqlAdapter }, // Build Connections Config // Setup connections using the named adapter configs connections: { myLocalDisk: { adapter: 'disk' }, myLocalMySql: { adapter: 'mysql', host: 'localhost', database: 'waterline_error', user: 'weruser', password: 'migjiii322' } } }; var C = Waterline.Collection.extend({ tableName: 'c', identity: 'c', connection: 'myLocalMySql', attributes: { c_id: {type:'integer'}, name: {type:'string'} } }); orm.loadCollection(C); app.listen(3000,function(){ console.log("Running Server on Port 3000."); orm.initialize(config, function(err, models) { if(err) throw err; app.models = models.collections; app.connections = models.connections; app.models.c.find().exec(function(err,models){ if(err) return res.json({ err: err }, 500); console.log(models); }); }); }); 

当我运行这个代码时，出现以下错误：

  if(err) throw err; ^ Error (E_UNKNOWN) :: Encountered an unexpected error : ER_ROW_IS_REFERENCED: Cannot delete or update a parent row: a foreign key constraint fails 

如何解决这个错误，使底部附近的.find（）函数实际上被触发？