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module ActiveRecord
module Integration
extend ActiveSupport::Concern
included do
##
# :singleton-method:
# Indicates the format used to generate the timestamp in the cache key.
# Accepts any of the symbols in <tt>Time::DATE_FORMATS</tt>.
#
# This is +:nsec+, by default.
class_attribute :cache_timestamp_format, :instance_writer => false
self.cache_timestamp_format = :nsec
end
# Returns a String, which Action Pack uses for constructing an URL to this
# object. The default implementation returns this record's id as a String,
# or nil if this record's unsaved.
#
# For example, suppose that you have a User model, and that you have a
# <tt>resources :users</tt> route. Normally, +user_path+ will
# construct a path with the user object's 'id' in it:
#
# user = User.find_by_name('Phusion')
# user_path(user) # => "/users/1"
#
# You can override +to_param+ in your model to make +user_path+ construct
# a path using the user's name instead of the user's id:
#
# class User < ActiveRecord::Base
# def to_param # overridden
# name
# end
# end
#
# user = User.find_by_name('Phusion')
# user_path(user) # => "/users/Phusion"
def to_param
# We can't use alias_method here, because method 'id' optimizes itself on the fly.
id && id.to_s # Be sure to stringify the id for routes
end
# Returns a cache key that can be used to identify this record.
#
# Product.new.cache_key # => "products/new"
# Product.find(5).cache_key # => "products/5" (updated_at not available)
# Person.find(5).cache_key # => "people/5-20071224150000" (updated_at available)
def cache_key
case
when new_record?
"#{self.class.model_name.cache_key}/new"
when timestamp = max_updated_column_timestamp
timestamp = timestamp.utc.to_s(cache_timestamp_format)
"#{self.class.model_name.cache_key}/#{id}-#{timestamp}"
else
"#{self.class.model_name.cache_key}/#{id}"
end
end
end
end
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