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ActiveRecord::Integration

Public Instance Methods

cache_key() click to toggle source

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)
    # 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
to_param() click to toggle source

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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