I am new to node js 
I had fetched content from database Data.
Data consist of _id, likechecked from this id I want to check with Like if the _id exist means I want to change the value of likechecked as 1 or else 0
Now my problem after fetching data  from Data I had itrete the fetched data for checking with Like 
After checking Like I can't change the value of likechecked
Data.find().then(data => {
            const user_id = "balaji@007"
            for (var _id in data) {
                Like.findOne({ postid: data[_id]._id,userid:user_id }).then(data2 => {
                    if(data2 != null){
                        data[_id].likechecked= 0
                    }else{
                        console.log("s")
                        data[_id].likechecked= 1
                    }
                console.log(data)
                });
            }
        }).catch(err => {
            console.log(err)
        });
 
     
    