I want to combine values from two collections to get data
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There are user collections and bulletin collections. The bulletin collection has the author's uid. I want to give data to the username matching the uid in the User collection, not the author's uid, before giving the bulletin board's information to the client.
User Schema
var userSchema = new Schema(
"userId": String,
"userPw": String,
"userName": String,
);
var User = mongoose.model('user', userSchema);
Board Schema
var baseBoardSchema = new Schema(
title: String,
authorUid: String,
);
var freeBoardSchema = new Schema(
baseBoard : type: baseBoardSchema, default: baseBoardSchema
);
var freeBoard = mongoose.model('freeBoard', freeBoardSchema);
So I did below. But it generate error. How I do?
FreeBoard.aggregate()
.lookup(
from: User,
localField: 'baseBoard.authorUid',
foreignField: '_id',
as : 'users'
)
.exec(function(error, freeBoards)
if(error)
//error
);
node.js mongodb mongoose
edited Nov 11 at 3:25
Cœur
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
add a comment |
up vote
0
down vote
favorite
There are user collections and bulletin collections. The bulletin collection has the author's uid. I want to give data to the username matching the uid in the User collection, not the author's uid, before giving the bulletin board's information to the client.
User Schema
var userSchema = new Schema(
"userId": String,
"userPw": String,
"userName": String,
);
var User = mongoose.model('user', userSchema);
Board Schema
var baseBoardSchema = new Schema(
title: String,
authorUid: String,
);
var freeBoardSchema = new Schema(
baseBoard : type: baseBoardSchema, default: baseBoardSchema
);
var freeBoard = mongoose.model('freeBoard', freeBoardSchema);
So I did below. But it generate error. How I do?
FreeBoard.aggregate()
.lookup(
from: User,
localField: 'baseBoard.authorUid',
foreignField: '_id',
as : 'users'
)
.exec(function(error, freeBoards)
if(error)
//error
);
node.js mongodb mongoose
edited Nov 11 at 3:25
Cœur
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
Thefromargument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by.from: User.collection.nameinstead. Or justfrom: 'users'which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.
– Neil Lunn
Aug 27 '17 at 8:27
AlsolocalFieldis just the relative path from the present model as well. So `localField: 'authorUid``
– Neil Lunn
Aug 27 '17 at 8:28
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
There are user collections and bulletin collections. The bulletin collection has the author's uid. I want to give data to the username matching the uid in the User collection, not the author's uid, before giving the bulletin board's information to the client.
User Schema
var userSchema = new Schema(
"userId": String,
"userPw": String,
"userName": String,
);
var User = mongoose.model('user', userSchema);
Board Schema
var baseBoardSchema = new Schema(
title: String,
authorUid: String,
);
var freeBoardSchema = new Schema(
baseBoard : type: baseBoardSchema, default: baseBoardSchema
);
var freeBoard = mongoose.model('freeBoard', freeBoardSchema);
So I did below. But it generate error. How I do?
FreeBoard.aggregate()
.lookup(
from: User,
localField: 'baseBoard.authorUid',
foreignField: '_id',
as : 'users'
)
.exec(function(error, freeBoards)
if(error)
//error
);
node.js mongodb mongoose
edited Nov 11 at 3:25
Cœur
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
There are user collections and bulletin collections. The bulletin collection has the author's uid. I want to give data to the username matching the uid in the User collection, not the author's uid, before giving the bulletin board's information to the client.
User Schema
var userSchema = new Schema(
"userId": String,
"userPw": String,
"userName": String,
);
var User = mongoose.model('user', userSchema);
Board Schema
var baseBoardSchema = new Schema(
title: String,
authorUid: String,
);
var freeBoardSchema = new Schema(
baseBoard : type: baseBoardSchema, default: baseBoardSchema
);
var freeBoard = mongoose.model('freeBoard', freeBoardSchema);
So I did below. But it generate error. How I do?
FreeBoard.aggregate()
.lookup(
from: User,
localField: 'baseBoard.authorUid',
foreignField: '_id',
as : 'users'
)
.exec(function(error, freeBoards)
if(error)
//error
);
node.js mongodb mongoose
node.js mongodb mongoose
edited Nov 11 at 3:25
Cœur
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
edited Nov 11 at 3:25
Cœur
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
edited Nov 11 at 3:25
Cœur
17.3k9102142
edited Nov 11 at 3:25
Cœur
17.3k9102142
edited Nov 11 at 3:25
Cœur
17.3k9102142
17.3k9102142
asked Aug 27 '17 at 8:06
HungryBird
204
asked Aug 27 '17 at 8:06
HungryBird
204
asked Aug 27 '17 at 8:06
HungryBird
204
204
Thefromargument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by.from: User.collection.nameinstead. Or justfrom: 'users'which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.
– Neil Lunn
Aug 27 '17 at 8:27
AlsolocalFieldis just the relative path from the present model as well. So `localField: 'authorUid``
– Neil Lunn
Aug 27 '17 at 8:28
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20
add a comment |
Thefromargument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by.from: User.collection.nameinstead. Or justfrom: 'users'which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.
– Neil Lunn
Aug 27 '17 at 8:27
AlsolocalFieldis just the relative path from the present model as well. So `localField: 'authorUid``
– Neil Lunn
Aug 27 '17 at 8:28
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20
The
from argument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by. from: User.collection.name instead. Or just from: 'users' which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.– Neil Lunn
Aug 27 '17 at 8:27
The
from argument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by. from: User.collection.name instead. Or just from: 'users' which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.– Neil Lunn
Aug 27 '17 at 8:27
Also
localField is just the relative path from the present model as well. So `localField: 'authorUid``– Neil Lunn
Aug 27 '17 at 8:28
Also
localField is just the relative path from the present model as well. So `localField: 'authorUid``– Neil Lunn
Aug 27 '17 at 8:28
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20
add a comment |
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The
fromargument expects a "collection name" as a "string" and not the model. You can just get the collection name from the model as a property by.from: User.collection.nameinstead. Or justfrom: 'users'which "should" be the default name. It actually does say "string" in the usage when you look at the documentation.– Neil Lunn
Aug 27 '17 at 8:27
Also
localFieldis just the relative path from the present model as well. So `localField: 'authorUid``– Neil Lunn
Aug 27 '17 at 8:28
thank you so much!! I solved this problem.
– HungryBird
Aug 27 '17 at 8:43
I have a question. I want to get only one value, same as authorUid and _id in the users collection. But I do not know why all the documents in the user collection are loaded. How I can?
– HungryBird
Aug 27 '17 at 9:20