Javascript 使用findOneAndUpdate$pull and populate不会更新或填充
这是我的数据:Javascript 使用findOneAndUpdate$pull and populate不会更新或填充,javascript,node.js,mongodb,mongoose,Javascript,Node.js,Mongodb,Mongoose,这是我的数据: { "_id" : ObjectId("594e762b03cc52508686ceef"), "_members" : [ "59527bd5e521801bf07eab98", "594ecca47a699d1775c2a2db" ], } const UserSchema = new Schema({ // ... posts : [{ type: Schema.Types.ObjectId, r
{
"_id" : ObjectId("594e762b03cc52508686ceef"),
"_members" : [
"59527bd5e521801bf07eab98",
"594ecca47a699d1775c2a2db"
],
}
const UserSchema = new Schema({
// ...
posts : [{ type: Schema.Types.ObjectId, ref: 'post' }],
// ...
})
let id = mongoose.mongo.ObjectID(req.params.id)
let member = mongoose.mongo.ObjectID(req.params.member)
let populateQuery = [
{path:'_members', select:'_id'}
]
Post.
findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': { '_id': member }}
},
{'new': true}
).
populate(populateQuery).
exec(
function (err, data) {
res.send(data)
}
);
我想从成员中删除59527bd5e521801bf07eab98
PostSchema:
const PostsSchema = new Schema({
// ...
_members: [{ type: Schema.Types.ObjectId, ref: 'user' }],
// ...
})
UserSchema:
{
"_id" : ObjectId("594e762b03cc52508686ceef"),
"_members" : [
"59527bd5e521801bf07eab98",
"594ecca47a699d1775c2a2db"
],
}
const UserSchema = new Schema({
// ...
posts : [{ type: Schema.Types.ObjectId, ref: 'post' }],
// ...
})
let id = mongoose.mongo.ObjectID(req.params.id)
let member = mongoose.mongo.ObjectID(req.params.member)
let populateQuery = [
{path:'_members', select:'_id'}
]
Post.
findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': { '_id': member }}
},
{'new': true}
).
populate(populateQuery).
exec(
function (err, data) {
res.send(data)
}
);
查找和更新:
{
"_id" : ObjectId("594e762b03cc52508686ceef"),
"_members" : [
"59527bd5e521801bf07eab98",
"594ecca47a699d1775c2a2db"
],
}
const UserSchema = new Schema({
// ...
posts : [{ type: Schema.Types.ObjectId, ref: 'post' }],
// ...
})
let id = mongoose.mongo.ObjectID(req.params.id)
let member = mongoose.mongo.ObjectID(req.params.member)
let populateQuery = [
{path:'_members', select:'_id'}
]
Post.
findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': { '_id': member }}
},
{'new': true}
).
populate(populateQuery).
exec(
function (err, data) {
res.send(data)
}
);
有趣的是,“总体”似乎只通过在本例中指定model
选项来起作用
此外,您只需将成员
直接提供给$pull
,因为\u id
在“填充”之前实际上不是属性。“\u members”
数组只是Post
本身中ObjectId
值的数组。因此,直接提供输入:
Post.findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': member }
},
{'new': true}
)
.populate({path:'_members', select:'_id', model: 'user' })
.exec(function(err,post) {
if (err) throw err; // or something
res.send(post)
})
还是有承诺
Post.findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': member }
},
{'new': true}
)
.populate({path:'_members', select:'_id', model: 'user' })
.then(post => res.send(post))
.catch(err => console.error(err)); // or something
交替调用:
或者交替使用承诺:
Post.findOneAndUpdate(
{'_id' : id} ,
{
$pull: { '_members': member }
},
{'new': true}
)
.then(post => Post.populate(post, {path:'_members', select:'_id', model: 'user' }))
.then(post => res.send(post)) // also populated
.catch(err => console.error(err)) // or whichever
当您仅要求返回文档中已嵌入的\u id
字段时,您不确定为什么要调用.populate()
,但这是另一种情况。使用模型
选项,人口实际上发生在这里
作为一个独立的演示:
const async = require('async'),
mongoose = require('mongoose'),
Schema = mongoose.Schema;
mongoose.Promise = global.Promise;
mongoose.set('debug',true);
mongoose.connect('mongodb://localhost/test');
const relSchema = new Schema({ c: String });
const testSchema = new Schema({
a: String,
b: [{ type: Schema.Types.ObjectId, rel: 'Rel' }]
})
const Test = mongoose.model('Test', testSchema);
const Rel = mongoose.model('Rel', relSchema);
function log(data) {
console.log(JSON.stringify(data, undefined, 2))
}
async.series(
[
(callback) =>
async.each(mongoose.models,(model,callback) =>
model.remove({},callback),callback),
(callback) =>
async.waterfall(
[
(callback) => Rel.create([{ c: 2 },{ c: 3 },{ c: 4 }],callback),
(rels,callback) => Test.create({ a: 1, b: rels },(err,test) => {
if (err) callback(err);
log(test);
callback(err,test.b.slice(1,3))
}),
(rels,calback) =>
Test.findOneAndUpdate(
{ 'a': 1 },
{ '$pull': { 'b': rels[0] } },
{ 'new': true }
)
.populate({ path: 'b', model: 'Rel' })
.exec((err,test) => {
if (err) callback(err);
log(test);
callback(err);
})
],
callback
)
],
(err) => {
if (err) throw err;
mongoose.disconnect();
}
)
以及输出:
Mongoose: tests.remove({}, {})
Mongoose: rels.remove({}, {})
Mongoose: rels.insert({ c: '2', _id: ObjectId("595714579afd8860e56d2ec7"), __v: 0 })
Mongoose: rels.insert({ c: '3', _id: ObjectId("595714579afd8860e56d2ec8"), __v: 0 })
Mongoose: rels.insert({ c: '4', _id: ObjectId("595714579afd8860e56d2ec9"), __v: 0 })
Mongoose: tests.insert({ a: '1', _id: ObjectId("595714579afd8860e56d2eca"), b: [ ObjectId("595714579afd8860e56d2ec7"), ObjectId("595714579afd8860e56d2ec8"), ObjectId("595714579afd8860e56d2ec9") ], __v: 0 })
{
"__v": 0,
"a": "1",
"_id": "595714579afd8860e56d2eca",
"b": [
"595714579afd8860e56d2ec7",
"595714579afd8860e56d2ec8",
"595714579afd8860e56d2ec9"
]
}
Mongoose: tests.findAndModify({ a: '1' }, [], { '$pull': { b: ObjectId("595714579afd8860e56d2ec8") } }, { new: true, upsert: false, remove: false, fields: {} })
Mongoose: rels.find({ _id: { '$in': [ ObjectId("595714579afd8860e56d2ec7"), ObjectId("595714579afd8860e56d2ec9") ] } }, { fields: {} })
{
"_id": "595714579afd8860e56d2eca",
"a": "1",
"__v": 0,
"b": [
{
"_id": "595714579afd8860e56d2ec7",
"c": "2",
"__v": 0
},
{
"_id": "595714579afd8860e56d2ec9",
"c": "4",
"__v": 0
}
]
}
提问时,请包括问题本身以及您看到的任何错误消息。不清楚什么对您不起作用:是连接问题,是客户端错误,语法错误,等等?@Eye本可以说得更清楚,但本例中的“错误”是.populate()
调用没有执行它应该执行的操作并检索相关数据。这就是问题的关键所在。修改标题以反映this@user1788781你可以用你新学到的东西来感谢我