### Home Classes Methods

### In Files

- lib/active_record/integration.rb

### Methods

- #cache_key
- #to_param

### Files

- README.rdoc

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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 48
    def cache_key
      case
      when new_record?
        "#{self.class.model_name.cache_key}/new"
      when timestamp = self[:updated_at]
        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

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 36
    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

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