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Module: ActiveRecord::Integration::ClassMethods

Relationships & Source Files
Defined in: activerecord/lib/active_record/integration.rb

Instance Method Summary

Instance Method Details

#collection_cache_key(collection = all, timestamp_column = :updated_at)

This method is for internal use only.
[ GitHub ] 

  


# File 'activerecord/lib/active_record/integration.rb', line 163



def collection_cache_key(collection = all, timestamp_column = :updated_at) # :nodoc:
  collection.send(:compute_cache_key, timestamp_column)
end


  








  

    #to_param(method_name = nil)  
  



  

    

Defines your model’s to_param method to generate “pretty” URLs using method_name, which can be any attribute or method that responds to to_s.



class User < ActiveRecord::Base
  to_param :name
end

user = User.find_by(name: 'Fancy Pants')
user.id         # => 123
user_path(user) # => "/users/123-fancy-pants"



Values longer than 20 characters will be truncated. The value is truncated word by word.



user = User.find_by(name: 'David Heinemeier Hansson')
user.id         # => 125
user_path(user) # => "/users/125-david-heinemeier"



Because the generated param begins with the record’s id, it is suitable for passing to find. In a controller, for example:



params[:id]               # => "123-fancy-pants"
User.find(params[:id]).id # => 123


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 147



def to_param(method_name = nil)
  if method_name.nil?
    super()
  else
    define_method :to_param do
      if (default = super()) &&
           (result = send(method_name).to_s).present? &&
             (param = result.squish.parameterize.truncate(20, separator: /-/, omission: "")).present?
        "#{default}-#{param}"
      else
        default
      end
    end
  end
end