服务器：Sailsjs
数据库：mysql
使用的节点库：sails-mysql（0.11.5）
我试图从sailsjs节点服务器插入mysql中的数据。
要插入的数据：
{
"first_name": "Admin Testing",
"last_name": "User",
"email": "[email protected]",
"role_id": 8
}
其中role_id与模型角色具有外键关系。
这里role_id：8在角色表中没有值。因此，插入时，它会抛出错误。但是，由于发生以下错误，我们无法控制或json.stringify这个错误：
TypeError: Converting circular structure to JSON
at JSON.stringify (<anonymous>)
at /var/www/aitachatbot/server/api/controllers/UserController.js:38:42
at wrapper (/var/www/aitachatbot/server/node_modules/waterline/node_modules/lodash/index.js:3602:19)
at applyInOriginalCtx (/var/www/aitachatbot/server/node_modules/waterline/lib/waterline/utils/normalize.js:421:80)
at wrappedCallback (/var/www/aitachatbot/server/node_modules/waterline/lib/waterline/utils/normalize.js:331:16)
at error (/var/www/aitachatbot/server/node_modules/switchback/lib/normalize.js:42:31)
at _switch (/var/www/aitachatbot/server/node_modules/switchback/lib/factory.js:56:28)
at /var/www/aitachatbot/server/node_modules/sails-hook-validation/lib/create.js:66:21
at /usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/query/dql/create.js:223:14
at wrapper (/usr/local/lib/node_modules/sails/node_modules/lodash/index.js:3592:19)
at applyInOriginalCtx (/usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/utils/normalize.js:421:80)
at wrappedCallback (/usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/utils/normalize.js:335:16)
at error (/usr/local/lib/node_modules/sails/node_modules/waterline/node_modules/switchback/lib/normalize.js:42:31)
at _switch (/usr/local/lib/node_modules/sails/node_modules/waterline/node_modules/switchback/lib/factory.js:56:28)
at afterwards (/usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/adapter/dql.js:87:16)
at wrapper (/usr/local/lib/node_modules/sails/node_modules/lodash/index.js:3592:19)
at applyInOriginalCtx (/usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/utils/normalize.js:421:80)
at wrappedCallback (/usr/local/lib/node_modules/sails/node_modules/waterline/lib/waterline/utils/normalize.js:335:16)
at error (/usr/local/lib/node_modules/sails/node_modules/waterline/node_modules/switchback/lib/normalize.js:42:31)
at _switch (/usr/local/lib/node_modules/sails/node_modules/waterline/node_modules/switchback/lib/factory.js:56:28)
at sendBackError (/var/www/aitachatbot/server/node_modules/sails-mysql/lib/connections/spawn.js:97:11)
at Object.poolfully [as releaseConnection] (/var/www/aitachatbot/server/node_modules/sails-mysql/lib/connections/release.js:28:12)
at /var/www/aitachatbot/server/node_modules/sails-mysql/lib/connections/spawn.js:90:37
at Query._callback (/var/www/aitachatbot/server/node_modules/sails-mysql/lib/adapter.js:395:27)
at Query.Sequence.end (/var/www/aitachatbot/server/node_modules/sails-mysql/node_modules/mysql/lib/protocol/sequences/Sequence.js:96:24)
at Query.ErrorPacket (/var/www/aitachatbot/server/node_modules/sails-mysql/node_modules/mysql/lib/protocol/sequences/Query.js:94:8)
at Protocol._parsePacket (/var/www/aitachatbot/server/node_modules/sails-mysql/node_modules/mysql/lib/protocol/Protocol.js:280:23)
at Parser.write (/var/www/aitachatbot/server/node_modules/sails-mysql/node_modules/mysql/lib/protocol/Parser.js:73:12)
我们怎样才能在sailsjs中处理这个错误？
从理论上讲，你不希望这些错误出现在生产中......即使它们确实如此，错误对象的完整json转储可能不是普通用户想要看到的。
您可能还会询问在调试时如何从此错误中获取完整信息。我想那里的好消息是，你似乎已经知道错误的根本原因了！
我们在节点中的错误对象可以根据它们的来源而具有完全不同的结构，但是我还没有遇到没有将错误智能转换为字符串的错误。这意味着，即使console.log(err)失败，像：console.log('Got an error: ' + err)可能会工作，将错误转换为字符串。
代码可能是这样的：
User.create({
"first_name": "Admin Testing",
"last_name": "User",
"email": "[email protected]",
"role_id": 8
}).exec(function(err, createdUser) {
if (err) {
var readableErr = '' + err;
console.log('Error creating user: ' + readableErr);
// return something the client will recognize and interpret
// you can use http error codes, or your own conventions
return res.send({
success: false,
message: readableErr
});
}
// do something with createdUser...
});