MongoDB select all where field value in a query list

Question

How to achieve below SQL in MongoShell?

Select TableA.* from TableA where TableA.FieldB in (select TableB.FieldValue from TableB)

Mongo doc

Answer 1

Finally this is how I could accomplish it.

// Get a array with values for name field
var botArray = db.bots.find({},{name:1}).toArray();

// loop through another collection
        db.Sessions.find().forEach(function(sess){
            if(sess.is_crawler == false){ // check a condition
                 // loop in the above  array
                botArray.forEach(function(b){
                //check if exists in the array
                   if(String(sess.useragent).toUpperCase().indexOf(b.name.toUpperCase()) > -1){
                        db.Sessions.update({ _id : sess._id} // find by _id
                        ,{
                            is_crawler : true // set a update value
                            },
                            {
                                upsert:false // do update only
                            })
                    } 
                  });
            }
        });