# Replacing render\_component **URL:** \ **Category:** Rails\ **Created:** [July 31, 2009, 2:30pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023 "2009-07-31T14:30:39Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Michael\_Cugley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5a626/32.png) [@Michael\_Cugley](https://www.ruby-forum.com/u/Michael_Cugley)\ **Post date:** [July 31, 2009, 2:30pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023/1 "2009-07-31T14:30:39Z")
New to Ruby, new to Rails. I’ve googled much on this topic, but I don’t think I have enough knowledge to form the correct queries. I’ve been given the task of resurrecting an old Rails app that’s not seen the light of day for two years. It seems to rely heavily on render\_component which I am given to understand by various error messages is now deprecated, unfashionable, and unfit to be seen with on social occasions. However, what I haven’t found is much on what to do with render\_component code to make it more modern, apart from “Components are a special-purpose approach that can often be replaced with better use of partials and filters.” Whatever they may be. Is there anywhere I can go to help me understand what the render\_component calls are doing in this particular instance, and how best to refactor them? – Mike Cugley removed\_email\_address@domain.invalid ---
**Author:** ![Michael\_Cugley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5a626/32.png) [@Michael\_Cugley](https://www.ruby-forum.com/u/Michael_Cugley)\ **Post date:** [July 31, 2009, 3:43pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023/2 "2009-07-31T15:43:50Z")
The render\_component was extracted as a plugin, so the documentation here should explain what render\_component is actually doing: > **[GitHub - rails/render\_component: NOTICE: official repository moved to...](https://github.com/rails/render_component/tree/master)** > > master I have provided an example here of a refactoring based on what you described below: > HTH, Nicholas ---
**Author:** ![Michael\_Cugley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5a626/32.png) [@Michael\_Cugley](https://www.ruby-forum.com/u/Michael_Cugley)\ **Post date:** [July 31, 2009, 5:08pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023/3 "2009-07-31T17:08:41Z")
Nicholas H. wrote: > HTH, > Nicholas I’ve had a go at installing the plugin (just to get the thing to work enough I can see what it does) but that just threw up other errors; however, I think the idea of looking through the docs and code is a good one. The refactoring looks interesting - I’ll see if I can wrap my newbie head around it 🙂 Thanks. – Mike Cugley removed\_email\_address@domain.invalid ---
**Author:** ![Michael\_Cugley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5a626/32.png) [@Michael\_Cugley](https://www.ruby-forum.com/u/Michael_Cugley)\ **Post date:** [July 31, 2009, 10:32pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023/4 "2009-07-31T22:32:57Z")
I had to do this with my first few rails apps after it turned out that render\_component had horrible performance. It was kind of a pain because the first rails books used them in examples and there was no discussion back then about whether or not it was a good idea. Anyway… From my experience a render component in a view should be replaced by a render :partial and a render component in a controller could be replaced by a filter of some sort. That said, it has been a long long time and I might be a bit off there. At anyrate, I had only really used them in views and converting them usually involved just making sure whatever variables they depended on were passed in as locals or already available as instance variables. Some specific code examples could allow use to make suggestions about how to start re-factoring. ---
**Author:** ![Michael\_Cugley](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/b5a626/32.png) [@Michael\_Cugley](https://www.ruby-forum.com/u/Michael_Cugley)\ **Post date:** [July 31, 2009, 5:19pm UTC](https://www.ruby-forum.com/t/replacing-render-component/173023/5 "2009-07-31T17:19:48Z")
Yeah, I wouldn’t be surprised if the plugin is not compatible with the latest versions of rails. It probably isn’t being maintained. If you like the concept of components, you can check out Cells which is an improved version of rendered\_component: > **[GitHub - trailblazer/cells: View components for Ruby and Rails.](https://github.com/trailblazer/cells/tree/master)** > > master This is an improved version of the concept. I haven’t tried it out myself, but have been meaning to. Cheers, Nicholas