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Diffstat (limited to 'activerecord/lib/active_record/integration.rb')
-rw-r--r-- | activerecord/lib/active_record/integration.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/integration.rb b/activerecord/lib/active_record/integration.rb new file mode 100644 index 0000000000..23c272ef12 --- /dev/null +++ b/activerecord/lib/active_record/integration.rb @@ -0,0 +1,49 @@ +module ActiveRecord + module Integration + # 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. + # + # ==== Examples + # + # 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 = self[:updated_at] + timestamp = timestamp.utc.to_s(:nsec) + "#{self.class.model_name.cache_key}/#{id}-#{timestamp}" + else + "#{self.class.model_name.cache_key}/#{id}" + end + end + end +end |