Legacy functionality from Rails 1.x and (maybe) 2.x days.
It execute the code in the controller#action before rendering the view into a string.
Add this line to your application's Gemfile:
gem 'rails-render-component'And then execute:
$ bundle install
Or install it yourself as:
$ gem install rails-render-component
Components allow you to call other actions for their rendered response while executing another action. You can either delegate the entire response rendering or you can mix a partial response in with your other content.
class WeblogController < ActionController::Base # Performs a method and then lets hello_world output its render def delegate_action do_other_stuff_before_hello_world render_component :controller => "greeter", :action => "hello_world", :params => { :person => "david" } end end
class GreeterController < ActionController::Base def hello_world render :text => "#{params[:person]} says, Hello World!" end end
The same can be done in a view to do a partial rendering:
Let's see a greeting: <%= render_component :controller => "greeter", :action => "hello_world" %>
It is also possible to specify the controller as a class constant, bypassing the inflector code to compute the controller class at runtime:
<%= render_component :controller => GreeterController, :action => "hello_world" %>
== When to use components
Components should be used with care. They're significantly slower than simply splitting reusable parts into partials and conceptually more complicated. Don't use components as a way of separating concerns inside a single application. Instead, reserve components to those rare cases where you truly have reusable view and controller elements that can be employed across many applications at once.
So to repeat: Components are a special-purpose approach that can often be replaced with better use of partials and filters.
After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/mathieujobin/render-component.
Copyright (c) 2007 Original creation by David Heinemeier Hansson, released under the MIT license Copyright (c) 2008 Rebirth by Pratik Naik and Dan Powell Copyright (c) 2010-2012 Upgrade to Rails 3.x by Volker Hochstein, Jonathan McCoy, Copyright (c) 2013-2015 Fixes for rails 4.x by Sergio Cambra, Richard Zheng and Mathieu Jobin Copyright (c) 2020-2021 Fix for Rails 5.0 by Mathieu Jobin