How I can find if string exists inside mongodb Array

Question

I am trying to find document based on profileID in MongoDB. I want to check if string postid exists in array or not. How I can do that? I tried $all.

Mongo data:

{
  "profileId": "abc",
  "likedPosts": [
    'post1',
    'post2'
  ]
}

Trying to find if post1 exists in array:

findOne({
  profileId
}, {
  likedPosts: {
    $all: ['post1']
  }
}, )

Did you try with $in? mongodb.com/docs/manual/reference/operator/query/in — nedoder
– nedoder, Commented Jun 16, 2022 at 11:07

Tushar Shahi · Accepted Answer · 2022-06-16 11:08:06Z

2

If you want to check if a string exists in an array field you can simply do:

findOne({
  profileId,
  likedPosts: 'post1'
  }
}, )

Docs

Also you might notice i have made the whole query as the first parameter. The second parameter is usually the callback to run, once the query has executed.

answered Jun 16, 2022 at 11:08

Tushar Shahi

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