update nth document in a nested array document in mongodb

Question

I need to update a document in an array inside another document in Mongo DB

    {
            \"_id\" : ObjectId(\"51cff693d342704b5047e6d8\"),
            \"aut         


        

Answer 1

If you are trying to do it dynamically in Node JS following should work.

i = 0;
selector = {};
operator = {};
selector['comments.' + i + '.email'] = 1; // {'comments.0.num_likes' : 1}
operator['$inc'] = selector;  // {'$inc' : {'comments.0.num_likes' : 1} }
db.posts.update({'permalink' : 'xyz'}, operator);