Optimizing Database Queries With Ruby On Rails Facade Pattern
Here's where to put the logic for database queries optimization in Ruby on Rails: use the Facade pattern to move code to a separate class like FilmCarrier, making it easier to test and combine data from different tables.
Where to put the logic related to database queries optimization in a Ruby on Rails application. We want to answer this question by showing you the ‘Facade’ approach.
Outline the problem
There is an application that stores a database of films and reviews. Every review has its own rate value.
class Film < ApplicationRecord
has_many :reviews
end
class Review < ApplicationRecord
belongs_to :film
end
We can calculate the average rate of each film,
class Film < ApplicationRecord
has_many :reviews
def avg_rating
reviews.av...