拒绝承诺没有达到捕获

我试图使用这种方法非顺序诺言输出。

express .json调用成功地从API发送了一个201到用户对象，但是在控制台中，我得到如下所示的未处理拒绝错误。 这似乎应该被控制器中的.catch处理程序捕获。 我想知道为什么会发生这种情况？

UserController的

module.exports.postUser = function (req, res, next) { var user = req.body.user; var ip = req.ip; userService.createUser(user, ip) .then(function (user) { res.status(201).json({"user": user.toJSON()}); }) .catch(function (err) { return next(err); }); }; 

userService

 module.exports.createUser = function (user, ip) { var user = new Promise(function (resolve, reject) { return resolve(User.forge(user)); }); return user.then(function validateUser(user) { return user.validate({validatePassword: true}); }) .then(function hash() { var password = user.value().get('password'); return hashPassword(password); }) .then(function setPassword(hashedPass) { user.value().set('hashedPass', hashedPass); return user.value().save(); }) .then(function () { return user; }); }; 

产量

 Unhandled rejection error: null value in column "status" violates not-null constraint at Connection.parseE (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/pg/lib/connection.js:539:11) at Connection.parseMessage (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/pg/lib/connection.js:366:17) at Socket.<anonymous> (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/pg/lib/connection.js:105:22) at Socket.emit (events.js:107:17) at readableAddChunk (_stream_readable.js:163:16) at Socket.Readable.push (_stream_readable.js:126:10) at TCP.onread (net.js:538:20) From previous event: at Client._query (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/dialects/postgres/index.js:122:12) at Client.query (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/client.js:127:24) at Runner.<anonymous> (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/runner.js:118:24) From previous event: at /Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/runner.js:44:21 From previous event: at Runner.run (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/runner.js:30:20) at QueryBuilder.Target.then (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/knex/lib/interface.js:27:43) at null.<anonymous> (/Users/lukel99/webstorm-workspace/rocketwagon-postgres-kickstart/node_modules/bookshelf/lib/model.js:208:36) at processImmediate [as _immediateCallback] (timers.js:367:17) 

Answer 1

最可能的原因是return user.value().save()不返回一个承诺，而是实现callback。 如果是这样的话，那么这个错误就会被抛出本地诺言try / catch块，因此不会被抓到，而是你的.catch（）。