我正在使用Mongoose(v。3.8.8)更新我的模型“权限”的一些数据。下面是模式:使用Promises处理CastoError与猫鼬
var PermissionSchema = new Schema({
name : {
type: String, required: true, index: true
},
httpVerb : {
type: String, required: true
},
url : {
type: String, required: true
}
});
mongoose.model('Permission', PermissionSchema);
现在我使用的承诺在另一模块功能:
module.exports.updatePermission = function (id, updatedPermission) {
var conditions = {_id: id};
var promiseUpdate = Permission.update(conditions, updatedPermission).exec();
logger.debug('this line is not executed when CastError occurs');
var promiseFind = promiseUpdate.then(function (permission) {
return Permission.findOne(conditions).exec();
}).then(null, function (error) {
logger.info('CastError does not get in here');
logger.error(error);
//error handled here
});
return promiseFind;
}
当我打电话与这个例子参数功能:
id: 53496a2e1722ff2d1a55a4d2
updatedPermission: {name: 'this is my new name'}
一切正常罚款因为_id 确实已经存在于集合中。
现在,当我用传递的目的下列参数的无效和不存在的_id:
id: 53496a2e1722ff2d1a55a4d22
updatedPermission: {name: 'this is my new name'}
我得到以下异常:
CastError: Cast to ObjectId failed for value "53496a2e1722ff2d1a55a4d22" at path "_id"
at ObjectId.cast (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/schema/objectid.js:116:13)
at ObjectId.castForQuery (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/schema/objectid.js:165:17)
at Query.cast (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/query.js:2291:32)
at castQuery (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/query.js:2015:18)
at Query.update (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/query.js:1704:21)
at Function.update (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/node_modules/mongoose/lib/model.js:1606:13)
at Object.module.exports.updatePermission (/home/jhon/environment/workspaces/nodejs-workspace/auth/server/app/repository/auth/PermissionRepository.js:50:36)
我期待得到这个错误当承诺被拒绝时,也就是updatePermission函数的第二个“then”。
现在的问题是:这是一个猫鼬的错误? - 如何在不使用try/catch的情况下处理这个问题?