Arguments must be aggregate pipeline operators at Aggregate.append

Asked Jun 06 '22 at 01:23

Active Jun 06 '22 at 02:25

Viewed 112 times

https://mongoplayground.net/p/MlQFd6J4rZc

Products.aggregate({
    $match: {
        $or: [
            { '_id': {$regex: queryRegex } },
            { 'name': {$regex: queryRegex } },
        ]
    },
    {
    $addFields: {
      favorite: {
        $cond: [
          {
            $in: [
              'xxx',
              '$favoritedBy'
            ]
          },
          true,
          false
        ]
      }
    }
  
})

Adding the $addFields portion broke the code. I am not sure why. It's working on the mongoplayground example I set up. Is there any reason for this? removing $addFields removes the error, but I should be able to create a new field, so I am confused as to what's going on.

Mongoose is version 5.11.12, so it's not caused by the version number, I think.

Error: Arguments must be aggregate pipeline operators at Aggregate.append

useNewUrlParser was set to true.

edited Jun 06 '22 at 02:25

asked Jun 06 '22 at 01:23

Sayaman

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You miss [ ] in aggregate. Products.aggregate( [ { ... stage1 } , { ... stage2 } ] ) – YuTing Jun 06 '22 at 02:06
Sorry, it's inside [], it's a typo. – Sayaman Jun 06 '22 at 02:06
You are missing a `}` to close the `$match` stage. – Montgomery Watts Jun 06 '22 at 02:18
Wait, it's the [] as YuTing said actually. Not sure if I should remove the question, but it seems like something other people may encounter. The error message is really not helpful here. – Sayaman Jun 06 '22 at 02:24

Arguments must be aggregate pipeline operators at Aggregate.append

0 Answers0