module ActiveRecordInCache::Methods::ClassMethods

Public Instance Methods

in_cache(column = :updated_at, options = {}, &block) click to toggle source

Returns records while automatically caching with the SQL to execute and the value of +maximum(:updated_at)+ as key.

Article.all.in_cache
# SELECT MAX("articles"."updated_at") FROM "articles"
# SELECT "articles".* FROM "articles"
#=> #<ActiveRecord::Relation ...>

Article.all.in_cache
# SELECT MAX("articles"."updated_at") FROM "articles"
#=> #<ActiveRecord::Relation ...>

column

If a column is passed, then uses this as the maximum argument.

Article.all.in_cache(:published_at)
# SELECT MAX("articles"."published_at") FROM "articles"
# SELECT "articles".* FROM "articles"
#=> #<ActiveRecord::Relation ...>

options

Supports the same arguments as Rails.cache.

Article.all.in_cache(expires_in: 5.minutes)
# File lib/active_record_in_cache.rb, line 39
def in_cache(column = :updated_at, options = {}, &block)
  value = block_given? ? all.instance_exec(&block) : all.maximum(column)
  name = "#{all.to_sql}_#{value}"
  Rails.cache.fetch(name, options) { all.to_a }
end