Node.js – Mongoose – Check if a collection exists

by

Option 2 is probably the cleanest. Assuming you have a Mongoose Connection object named conn that’s been opened using mongoose.createConnection, you can access the native mongo Db object via conn.db. From there you can call collectionNames which should provide what you’re looking for:

conn.db.collectionNames(function (err, names) {
    // names contains an array of objects that contain the collection names
});

You can also pass a collection name as a parameter to collectionNames to filter the results to just what you’re looking for.

Mongoose 4.x Update

In the 2.x version of the MongoDB native driver that Mongoose 4.x uses, collectionNames has been replaced by listCollections which accepts a filter and returns a cursor so you would do this as:

mongoose.connection.db.listCollections({name: 'mycollectionname'})
    .next(function(err, collinfo) {
        if (collinfo) {
            // The collection exists
        }
    });

More Related Contents:

  1. Push items into mongo array via mongoose
  2. E11000 duplicate key error index in mongodb mongoose
  3. Mongoose: findOneAndUpdate doesn’t return updated document
  4. Mongoose populate vs object nesting
  5. Stop Mongoose from creating _id property for sub-document array items
  6. Why does mongoose always add an s to the end of my collection name
  7. mongodb/mongoose findMany – find all documents with IDs listed in array
  8. MongoDB/Mongoose querying at a specific date?
  9. MongoError: The ‘cursor’ option is required, except for aggregate with the explain argument
  10. Making mongoose.js queries run synchronously
  11. add created_at and updated_at fields to mongoose schemas
  12. How to populate a sub-document in mongoose after creating it?
  13. mongoose custom validation using 2 fields
  14. Mongoose (mongodb) batch insert?
  15. (node:3341) DeprecationWarning: Mongoose: mpromise
  16. Mongoose update without callback
  17. Mongoose populate nested array
  18. How to fix ‘Error: querySrv EREFUSED’ when connecting to MongoDB Atlas?
  19. How to define object in array in Mongoose schema correctly with 2d geo index
  20. Difference between MongoDB and Mongoose
  21. How can I generate an ObjectId with mongoose?
  22. How to get all count of mongoose model?
  23. Mongoose: CastError: Cast to ObjectId failed for value “[object Object]” at path “_id”
  24. Model.find() returns empty in mongoose [duplicate]
  25. Mongoose – caused by :: 11000 E11000 duplicate key error index?
  26. nodejs mongodb object id to string
  27. Mongoose overwrite the document rather that `$set` fields
  28. Mongodb $lookup dynamic collection
  29. Mongoose complex (async) virtuals
  30. Create unique autoincrement field with mongoose [duplicate]

Leave a Comment