如何使用多个条件更新mongodb的文档？

Question

I have a post schema that simply has attributes like _id, text, likes and comments. I want to push user id into likes array it if fulfills two conditions. Firstly the id of the post should match the query param and then the likes array should not already contain the id of the person trying to like the post. Instead error msg should come: Post already liked.

Like key pair from post schema

likes:[{
    user:{
        type: Schema.Types.ObjectId,
        refPath:'onModel'
    }        
}]

I wrote the following query but it doesn't work. The update part works fine but some issue with the first argument.

Post.update({$and: [{ _id: req.params.postid},{"likes": { $ne : { user: 
authorizedData.jwt_payload.patient._id  }}}]},
            { $push: { likes: {user: authorizedData.jwt_payload.patient._id }}})
            .then(post => res.json(post))
            .catch(err => res.json(err))

Any suggestions please?

Answer 1

Ok, it can be simple in this way :

Post.update({
    _id: req.params.postid,
    'likes.user': {
        $ne:
            authorizedData.jwt_payload.patient._id
    }
},
    { $push: { likes: { user: authorizedData.jwt_payload.patient._id } } })
    .then(post => res.json(post))
    .catch(err => res.json(err))