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How to check if a document il linked to another in MongoDB [duplicate]

0

This question already has an answer here:

• 
  Why do my MongooseJS ObjectIds fail the equality test?
  
  1 answer
  
  

Suppose that I have two collections:

Users

_id:5c810da8c714a02e84d16d16
username:foo

Tokens

_id: 5c81347b00370c2848db8725
_userId: 5c810da8c714a02e84d16d16
token: "83790bf08fa16eec1c3c6761d0c1be4f"

I'm trying to check if the token with id 5c81347b00370c2848db8725 is linked to the user with id 5c810da8c714a02e84d16d16.

The first problem is that I only have the username to find the user details, so this is my solution:

User.findOne( username: req.body.username , async function (err, user) 
 let token = await Token.findOne( token: req.body.token );

 console.log(token._userId);
 console.log(user._id);
 console.log(token._userId != user._id);

 if (token == null );

now the code above will return the following result:

5c810da8c714a02e84d16d16
5c810da8c714a02e84d16d16
true

but should return false because the record are equal.. What I did wrong?

node.js mongodb express mongoose

share|improve this question

asked Mar 7 at 15:28

teresteres

1257

marked as duplicate by Neil Lunn mongodb
Users with the  mongodb badge can single-handedly close mongodb questions as duplicates and reopen them as needed.

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Mar 7 at 20:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

0

This question already has an answer here:

• 
  Why do my MongooseJS ObjectIds fail the equality test?
  
  1 answer
  
  

Suppose that I have two collections:

Users

_id:5c810da8c714a02e84d16d16
username:foo

Tokens

_id: 5c81347b00370c2848db8725
_userId: 5c810da8c714a02e84d16d16
token: "83790bf08fa16eec1c3c6761d0c1be4f"

I'm trying to check if the token with id 5c81347b00370c2848db8725 is linked to the user with id 5c810da8c714a02e84d16d16.

The first problem is that I only have the username to find the user details, so this is my solution:

User.findOne( username: req.body.username , async function (err, user) 
 let token = await Token.findOne( token: req.body.token );

 console.log(token._userId);
 console.log(user._id);
 console.log(token._userId != user._id);

 if (token == null );

now the code above will return the following result:

5c810da8c714a02e84d16d16
5c810da8c714a02e84d16d16
true

but should return false because the record are equal.. What I did wrong?

node.js mongodb express mongoose

share|improve this question

asked Mar 7 at 15:28

teresteres

1257

marked as duplicate by Neil Lunn mongodb
Users with the  mongodb badge can single-handedly close mongodb questions as duplicates and reopen them as needed.

StackExchange.ready(function()
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);
Mar 7 at 20:39

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

This question already has an answer here:

• 
  Why do my MongooseJS ObjectIds fail the equality test?
  
  1 answer
  
  

Suppose that I have two collections:

Users

_id:5c810da8c714a02e84d16d16
username:foo

Tokens

_id: 5c81347b00370c2848db8725
_userId: 5c810da8c714a02e84d16d16
token: "83790bf08fa16eec1c3c6761d0c1be4f"

I'm trying to check if the token with id 5c81347b00370c2848db8725 is linked to the user with id 5c810da8c714a02e84d16d16.

The first problem is that I only have the username to find the user details, so this is my solution:

User.findOne( username: req.body.username , async function (err, user) 
 let token = await Token.findOne( token: req.body.token );

 console.log(token._userId);
 console.log(user._id);
 console.log(token._userId != user._id);

 if (token == null );

now the code above will return the following result:

5c810da8c714a02e84d16d16
5c810da8c714a02e84d16d16
true

but should return false because the record are equal.. What I did wrong?

node.js mongodb express mongoose

share|improve this question

asked Mar 7 at 15:28

teresteres

1257

_id:5c810da8c714a02e84d16d16
username:foo

_id: 5c81347b00370c2848db8725
_userId: 5c810da8c714a02e84d16d16
token: "83790bf08fa16eec1c3c6761d0c1be4f"

User.findOne( username: req.body.username , async function (err, user) 
 let token = await Token.findOne( token: req.body.token );

 console.log(token._userId);
 console.log(user._id);
 console.log(token._userId != user._id);

 if (token == null );

5c810da8c714a02e84d16d16
5c810da8c714a02e84d16d16
true

share|improve this question

asked Mar 7 at 15:28

teresteres

1257

share|improve this question

asked Mar 7 at 15:28

teresteres

1257

asked Mar 7 at 15:28

teresteres

1257

asked Mar 7 at 15:28

teresteres

1257

1 Answer
1

active

oldest

votes

1

The equality operator is mostly useful for comparing native types, such as strings. In MongoDB, the ObjectID is an object that cannot be compared with == operator.

Mongoose uses the mongodb-native driver. These use the native ObjectID type from the Mongodb driver. Object IDs can be compared using the .equals() method.

With your example, you should write your check as:

user._id.equals(token._userId)

Documentation

Note that if you want to use Equal, you should convert the ObjectIDs to strings prior to making the comparison:

user._id.toString() === token._userId.toString()

share|improve this answer

edited Mar 7 at 15:46

answered Mar 7 at 15:42

PierrePierre

4,09922039

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ok so essentially mine solution didn't works because the object are not string but object of mongo
  
  – teres
  Mar 7 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That is correct
  
  – Pierre
  Mar 7 at 15:46
  

  
  
  
  

add a comment | 

1

The equality operator is mostly useful for comparing native types, such as strings. In MongoDB, the ObjectID is an object that cannot be compared with == operator.

Mongoose uses the mongodb-native driver. These use the native ObjectID type from the Mongodb driver. Object IDs can be compared using the .equals() method.

With your example, you should write your check as:

user._id.equals(token._userId)

Documentation

Note that if you want to use Equal, you should convert the ObjectIDs to strings prior to making the comparison:

user._id.toString() === token._userId.toString()

share|improve this answer

edited Mar 7 at 15:46

answered Mar 7 at 15:42

PierrePierre

4,09922039

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ok so essentially mine solution didn't works because the object are not string but object of mongo
  
  – teres
  Mar 7 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That is correct
  
  – Pierre
  Mar 7 at 15:46
  

  
  
  
  

add a comment | 

1

The equality operator is mostly useful for comparing native types, such as strings. In MongoDB, the ObjectID is an object that cannot be compared with == operator.

Mongoose uses the mongodb-native driver. These use the native ObjectID type from the Mongodb driver. Object IDs can be compared using the .equals() method.

With your example, you should write your check as:

user._id.equals(token._userId)

Documentation

Note that if you want to use Equal, you should convert the ObjectIDs to strings prior to making the comparison:

user._id.toString() === token._userId.toString()

share|improve this answer

edited Mar 7 at 15:46

answered Mar 7 at 15:42

PierrePierre

4,09922039

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ok so essentially mine solution didn't works because the object are not string but object of mongo
  
  – teres
  Mar 7 at 15:45
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  That is correct
  
  – Pierre
  Mar 7 at 15:46
  

  
  
  
  

add a comment | 

The equality operator is mostly useful for comparing native types, such as strings. In MongoDB, the ObjectID is an object that cannot be compared with == operator.

Mongoose uses the mongodb-native driver. These use the native ObjectID type from the Mongodb driver. Object IDs can be compared using the .equals() method.

With your example, you should write your check as:

user._id.equals(token._userId)

Documentation

Note that if you want to use Equal, you should convert the ObjectIDs to strings prior to making the comparison:

user._id.toString() === token._userId.toString()

share|improve this answer

edited Mar 7 at 15:46

answered Mar 7 at 15:42

PierrePierre

4,09922039

user._id.equals(token._userId)

user._id.toString() === token._userId.toString()

share|improve this answer

edited Mar 7 at 15:46

answered Mar 7 at 15:42

PierrePierre

4,09922039

answered Mar 7 at 15:42

PierrePierre

4,09922039

answered Mar 7 at 15:42

PierrePierre

4,09922039