with_action

= WithAction

A respond_to style helper for doing different actions based on which request parameters are passed. Specifically, it is helpful if you want to use multiple form buttons on a page, such as "Save", "Save and Continue Editing", and "Cancel". with_action executes different blocks based on what the presence of request parameters.

def create with_action do |a| a.cancel { redirect_to articles_path } a.any do @article = Article.new(params[:article]) if @article.save a.save { redirect_to article_path(@article) } a.edit { redirect_to article_path(@article) } a.approve do @article.approve! redirect_to article_path(@article) end else render :action => 'new' end end end end

A block is invoked if a parameter with the same name exists and is not blank. Here is an example of a form to submit to this action:

<%= submit_tag 'Save', :name => 'save' %> <%= submit_tag 'Save & Continue Editing', :name => 'edit' %> <%= submit_tag 'Save & Approve', :name => 'approve' %> <%= submit_tag 'Cancel', :name => 'cancel' %>

If an @any@ block is present and no parameter that matches one of the other blocks, it is called by default, otherwise the first block will be called. The @any@ block is the only one that can have nesting and be called multiple times.

If a block is not passed to the action, then a method with the same name is called on the controller:

def update with_action do |a| a.publish a.reject a.any { redirect_to root_path } end end

def publish # … end

def reject # … end

Which can be abbreviated as:

def update with_action(:publish, :reject) do |a| a.any { redirect_to root_path } end end

(c) Copyright 2007 Brandon Keepers ([e-mail])