MongoDB tip: Using the positional $ operator in array
This post is a quick documentation on how to update elements in arrays using positional operator to look for the value to update. Let's setting up our example: db.movies.insertMany( [ { "title" : "Batman" , "category" : [ "action" , "adventure" ], "imdb_rating" : 7.6 , "budget" : 35 }, { "title" : "Godzilla" , "category" : [ "action" , "adventure" , "sci-fi" ], "imdb_rating" : 6.6 }, { "title" : "Home Alone" , "category" : [ "family" , "comedy" ], "imdb_rating" : 7.4 } ]) From MongoDB documentation: The positional $ operator $ is a positional operator that specifies an element in an array to update. It acts as a placeholder for the first element that matches the query document. $ replaces the element in...