Agenda: TypeError: this._mdb.collection is not a function

[arpithparikh]

While compiling the node application , I'm getting following error! Hope developers can help me out to sort this error. Working on Mongo reporting tool using agenda.

ypeError: this._mdb.collection is not a function
    at Agenda.db_init (/Worker/node_modules/agenda/lib/agenda.js:100:15)
    at Agenda.mongo (/Worker/node_modules/agenda/lib/agenda.js:58:8)
    at new module.exports (/Worker/node_modules/agenda/lib/agenda.js:46:10)
    at Object.<anonymous> (/Worker/app.js:30:14)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)

[hvarday]

Even I'm getting the same error, did you find any solution @arpithparikh ?

[SamClayton]

Same issue when I supply an existing mongoClient instance (the variable 'db' here).

agenda = new Agenda({
    name: agendaName,
    mongo: db,
    db: { collection: agendaCollection },
    processEvery: processEvery
  })

[simison]

Are you ensuring you don't try to initiate Agenda before you've really connected to MongoDB?

See example:
https://mongodb.github.io/node-mongodb-native/2.2/quick-start/quick-start/#connect-to-mongodb

same for Mongoose:
http://mongoosejs.com/docs/index.html

[yanisIk]

Did someone find a solution for that ?

I tried the following and it didn't work:

• Letting agenda handle the connection.
• Using the same mongoose connection as the one in my app and only initiating agenda once the connection is open.

[SamClayton]

In my case, it turned out that the variable being passed as 'db' was being mediated by another module and was not always resolving to a mongoClient instance. I cannot, however, speak to the OP's issue.

[ezos86]

??? Anyone.. still getting this.

[FlawaCLV]

I'm getting this.databaseConnection.collection is not a function. Any idea ?!

[gubarez]

For mongoose you need to use db.connection instead.

agenda = new Agenda({ 
  mongo: db.connection
})

[dandv]

I get the "this._mdb.collection is not a function" erorr if I try to instantiate Agenda by passing a mongoClient object to new Agenda({ mongo: mongoClient }):

```js
const mongoClient = await MongoClient.connect(mongoUrl, { useNewUrlParser: true });

config.agenda = new Agenda({
mongo: config.mongoClient,
});

The solution is to pass the database, not the client. If you only pass the mongoClient, Agenda would not know which database it should use.

```js
const mongoClient = await MongoClient.connect(mongoUrl, { useNewUrlParser: true });

config.agenda = new Agenda({
mongo: config.mongoClient.db(), // <-- note the .db()
});

[mdelclaro]

@dandv that worked :)

[vemundeldegard]

Thanks @dandv !

[matthiasdg]

also noticed this, think this is due to the changes in node-mongodb-native v3; see https://github.com/mongodb/node-mongodb-native/blob/master/CHANGES_3.0.0.md
MongoClient.connect works as expected but it returns the MongoClient instance instead of a database object.
So documentation should probably be updated to reflect these changes

[simison]

this is due to the changes in node-mongodb-native v3
...
So documentation should probably be updated to reflect these changes

Good finding! Could someone do a pull request, please?

[nkemcels]

This worked for me:

const client = await MongoClient.connect("mongodb://localhost:27017");
const agenda = new Agenda().mongo(client.db("database_name"), "jobs");

As from version 3.0 of the mongodb nodejs native driver, you get an instance of the client object containing the database object instead