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sgrif/example.rb

Created June 16, 2014 00:31
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example.rb
class User < ActiveRecord::Base
has_many :posts
end
class Post < ActiveRecord::Base
belongs_to :user, counter_cache: true
end
user = User.create
user.posts_count # => 0
user.posts << Post.new # executes `UPDATE users SET posts_count = COALESCE(posts_count, 0) + 1 WHERE id = ?`
user.posts_count # => 0
user.reload.posts_count # => 1
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