module ActionController # The record identifier encapsulates a number of naming conventions for dealing with records, like Active Records or # Active Resources or pretty much any other model type that has an id. These patterns are then used to try elevate # the view actions to a higher logical level. Example: # # # routes # map.resources :posts # # # view # <% div_for(post) do %>
# <%= post.body %> What a wonderful world! # <% end %>
# # # controller # def destroy # post = Post.find(params[:id]) # post.destroy # # respond_to do |format| # format.html { redirect_to(post) } # Calls polymorphic_url(post) which in turn calls post_url(post) # format.js do # # Calls: new Effect.fade('post_45'); # render(:update) { |page| page[post].visual_effect(:fade) } # end # end # end # # As the example above shows, you can stop caring to a large extent what the actual id of the post is. You just know # that one is being assigned and that the subsequent calls in redirect_to and the RJS expect that same naming # convention and allows you to write less code if you follow it. module RecordIdentifier extend self # Returns plural/singular for a record or class. Example: # # partial_path(post) # => "posts/post" # partial_path(Person) # => "people/person" def partial_path(record_or_class) klass = class_from_record_or_class(record_or_class) "#{klass.name.tableize}/#{klass.name.demodulize.underscore}" end # The DOM class convention is to use the singular form of an object or class. Examples: # # dom_class(post) # => "post" # dom_class(Person) # => "person" # # If you need to address multiple instances of the same class in the same view, you can prefix the dom_class: # # dom_class(post, :edit) # => "edit_post" # dom_class(Person, :edit) # => "edit_person" def dom_class(record_or_class, prefix = nil) [ prefix, singular_class_name(record_or_class) ].compact * '_' end # The DOM id convention is to use the singular form of an object or class with the id following an underscore. # If no id is found, prefix with "new_" instead. Examples: # # dom_id(Post.new(:id => 45)) # => "post_45" # dom_id(Post.new) # => "new_post" # # If you need to address multiple instances of the same class in the same view, you can prefix the dom_id: # # dom_id(Post.new(:id => 45), :edit) # => "edit_post_45" def dom_id(record, prefix = nil) prefix ||= 'new' unless record.id [ prefix, singular_class_name(record), record.id ].compact * '_' end # Returns the plural class name of a record or class. Examples: # # plural_class_name(post) # => "posts" # plural_class_name(Highrise::Person) # => "highrise_people" def plural_class_name(record_or_class) singular_class_name(record_or_class).pluralize end # Returns the singular class name of a record or class. Examples: # # singular_class_name(post) # => "post" # singular_class_name(Highrise::Person) # => "highrise_person" def singular_class_name(record_or_class) class_from_record_or_class(record_or_class).name.underscore.tr('/', '_') end private def class_from_record_or_class(record_or_class) record_or_class.is_a?(Class) ? record_or_class : record_or_class.class end end end