mongoose and gridfs-locking-stream interaction #131

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1. arn-the-long-beard commented on Apr 13, 2018

   

   arn-the-long-beard

   on Apr 13, 2018

   More actions

   Hello.

   I also get the same error

   Error: missing db argument new Grid(db, mongo)

   Then if I replace with
   ``javascript
   const conn = mongoose.connection

   var Grid = require('gridfs-stream');
   Grid.mongo = mongoose.mongo
   const gfs = Grid(conn)
   ``

   Then I get

   "TypeError: Cannot read property 'readPreference' of null

   I am using :

   • "mongoose": "^5.0.9",
   • MongoDB Version | 3.6.2
   • "gridfs-stream": "^1.1.1"

   Best regards,

   Arn

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2. deresegetachew commented on May 2, 2018

   

   deresegetachew

   on May 2, 2018

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   my experience is i was using gridfs-stream with multer-gridfs-storage
   for some reason mongoose:"^5.0" has issues with gridfs-stream when making connections and when i managed to make the connections multer-gridfs-stroage failed. so whatI resorted to was to use two mongoose versions in my application. At the end of the day i had different connections one to my GridFS and another to my mongoDatabase ; therefor i went on to use V5.0 for my mongodb and v4. for my GridFS. on how to install same packages of different version follow this https://gist.github.com/mnpenner/c46a5eff34cfa91f361a8b3baa249a10
3. ldevalbray commented on Oct 13, 2018

   

   ldevalbray

   on Oct 13, 2018

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   Hey I have the same issue ...
   Any solution found ? I would like to avoid @deresegetachew 's one ;)
4. stelapo commented on Dec 13, 2018

   

   stelapo

   on Dec 13, 2018

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   Hey I have the same issue ...
   Any solution found ?
6. zenbert5 commented on Jan 24, 2019

   

   zenbert5

   on Jan 24, 2019

   Last edited by zenbert5

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   for reference i have encountered this. two difference instances of this happened with my code --

   1. mongo server isn't accessible for whatever reason

   2. modified my connection code -->
      const conn = mongoose.createConnection('your URI');
      var gfs;
      conn.once('open', () => {
      gfs = Grid(conn.db, mongoose.mongo);
      })
      from const conn = mongoose.connection(...)

      "express": "^4.16.4",
      "gridfs-stream": "^1.1.1",
      "mongoose": "^5.4.5",

   mongo DB v4.02

   Good luck
7. kuzdogan commented on Oct 3, 2019

   

   kuzdogan

   on Oct 3, 2019

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   Refer to here: #56

   Using the db object instead of the connection resolved my issue.
   So instead of this:

   var gfs;
   var db = mongoose.connection;
   db.on('error', console.error.bind(console, 'connection error:'));
   db.once('open', function() {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(db, mongoDriver);
   });
   

   To this

   var gfs;
   var connection = mongoose.connection;
   connection.on('error', console.error.bind(console, 'connection error:'));
   connection.once('open', function() {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(connection.db, mongoDriver);
   });
   

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8. MZeeshan373 commented on Feb 23, 2021

   

   MZeeshan373

   on Feb 23, 2021

   Last edited by MZeeshan373

   More actions

   Refer to here: #56

   Using the db object instead of the connection resolved my issue.
   So instead of this:

   var gfs;
   var db = mongoose.connection;
   db.on('error', console.error.bind(console, 'connection error:'));
   db.once('open', function() {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(db, mongoDriver);
   });
   

   To this

   var gfs;
   var connection = mongoose.connection;
   connection.on('error', console.error.bind(console, 'connection error:'));
   connection.once('open', function() {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(connection.db, mongoDriver);
   });
   

   Thanks @kuzdogan This resolved my issue .

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9. Chris-QIU commented on Jun 19, 2021

   

   Chris-QIU

   on Jun 19, 2021

   Last edited by Chris-QIU

   More actions

   Refer to here: #56

   Using the db object instead of the connection resolved my issue.
   So instead of this:

   var gfs;
   var db = mongoose.connection;
   db.on('error', console.error.bind(console, 'connection error:'));
   db.once('open', function() {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(db, mongoDriver);
   });
   

   To this

   var gfs;
   var connection = mongoose.connection;
   connection.on('error', console.error.bind(console, 'connection error:'));
   connection.once('open', function()  {
     console.log("Connected!")
     var mongoDriver = mongoose.mongo;
     gfs = new Gridfs(connection.db, mongoDriver);
   });
   

   @kuzdogan Thank you very much, this works.

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