CODEWITHSUNDEEP
node.jsmongodbmongooseaggregation-framework
APixel Visuals
APixel Visuals

Reputation: 1648

Mongoose - MongoError: Unrecognized pipeline stage name: '$eq'

When I run the following Mongoose aggregate query, I get an error:

Query:

await Users.aggregate([
    { $eq: ["$bot", false] }
]);

Error:

MongoError: Unrecognized pipeline stage name: '$eq'
    at queryCallback (/root/Geola/node_modules/mongodb-core/lib/cursor.js:248:25)
    at /root/Geola/node_modules/mongodb-core/lib/connection/pool.js:532:18
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickDomainCallback (internal/process/next_tick.js:218:9)

Am I using it wrong?

MongoDB: 4.0.6
Mongoose: 5.4.13
Ubuntu: 16.04

Upvotes: 1

Views: 1734

Answers (2)

Edwin Babu
Edwin Babu

Reputation: 719

The $eq operator matches documents where the value of a field equals the specified value.

{ <field>: { $eq: <value> } }

You can try this method to filter based on a condition

db.inventory.find( { bot: { $eq: false } } )

More details in docs

When you use Aggregate. Documents enter a multi-stage pipeline that transforms the documents into aggregated results. You have to use match to pass the match pipeline in your case.

You can learn more about aggregate pipeline here

Upvotes: 1

APixel Visuals
APixel Visuals

Reputation: 1648

Not sure why my original method didn't work, or why this works any better, but here's what fixed it for me:

await Users.aggregate([
    { $match: { $expr: { $eq: ["$bot", false] } } }
]);

Upvotes: 1

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