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)
# File lib/active_record/integration.rb, line 37 37: def cache_key 38: case 39: when new_record? 40: "#{self.class.model_name.cache_key}/new" 41: when timestamp = self[:updated_at] 42: timestamp = timestamp.utc.to_s(:number) 43: "#{self.class.model_name.cache_key}/#{id}-#{timestamp}" 44: else 45: "#{self.class.model_name.cache_key}/#{id}" 46: end 47: 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 resources :users 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"
# File lib/active_record/integration.rb, line 25 25: def to_param 26: # We can't use alias_method here, because method 'id' optimizes itself on the fly. 27: id && id.to_s # Be sure to stringify the id for routes 28: end
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