mongoid-categorized_counter_cache
Enhancement to counter cache for mongoid
Installation
Add this line to your application's Gemfile:
gem 'mongoid-categorized_counter_cache'And then execute:
$ bundle
Or install it yourself as:
$ gem install mongoid-categorized_counter_cache
Usage
When you have a one-to-many relation using mongoid, you can define a counter cache attribute for the relation.
class Author
include Mongoid::Document
has_many :books
end
class Book
include Mongoid::Document
belongs_to :author, counter_cache: true
endThen:
author = Author.create
author.books.create
author.books_count
# => 1
# returns a cached count of author.booksmongoid-categorized_counter_cache helps to you cache the count of children documents by given category (any attribute of child document)
class Author
include Mongoid::Document
has_many :books
end
class Book
include Mongoid::Document
include Mongoid::CategorizedCounterCache
field :genre
belongs_to :author, counter_cache: true
categorized_counter_cache :author do |book|
book.genre
end
endThen:
author = Author.create
author.books.create genre: 'fiction'
author.books.create genre: 'drama'
author.books_count
# => 2
# returns a cached count of all author.books
author.books_fiction_count
# => 1
# returns a cached count of all author.books which has a fiction genre
author.books_drama_count
# => 1
# returns a cached count of all author.books which has a drama genre