how to iteratively compare a field with all other documents' fields in a collection in mongodb?

shriyans varma
shriyans varma used Ask the Experts™
on
So i have a user schema like this:

var user_schema = new Schema({
   username:{type:String,required: true, unique : true, trim: true},
   college:{type:String,required: true},
   password:{type:String,required: true, trim: true},
   email:{type:String,required: true, unique : true, trim: true},
   phone:{type:Number,required: true, unique : true, trim: true},
   dp:{type:String},
   tag:{type:String},
   description:{type:String},
   friends:[{type:String}],
   pending:[{type:String}],
   skills:{type:String},
   bucket:[{type:String}]
  });

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and my objective is, to search the all the documents in the collection to get people based on the following conditions:

1. They should not be in the users' "friends" array.
2. They should not be in the users' "pending" array.
3. They should have the same "tag" (a string value) as the user.

So, basically I have to compare the users' fields ("friends","pending" and "tags"), with fields of all documents in the whole collection.

How do I do it, using mongoose (nodejs mongodb library)
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