--> Test: When you push a movie into a user's list and do Movie.save(), will that movie have the same id as in the database?
Note: TMDb provides users the option to "maintain and share your favorite and watch lists"--see if it would make sense to integrate these, or if we want/need to save movies to our local database/ users.
-After a user has viewed a list of movies currently in theaters, user can select one (ex: by clicking one of two buttons, user can add a film to either have-seen or want-to-see-list
-Initially: inserting a title into a user's list (can test on Postman, etc.)
-Eventually: Adding buttons to movie show views.
Figure out how to add movies from TMDb to a user's want-to-see and have-seen lists.
Step 2: pull from our app's database into the user's database.
type: mongoose.Schema.Types.ObjectId
&ref: 'Movie'
--> Test: When you push a movie into a user's list and do Movie.save(), will that movie have the same id as in the database?