From: Mike Stok <mike@...>
Date: 2012-04-10T20:47:47+09:00
Subject: Re: Best way of implementing controllers for m:n model relation (Car->Parts)


On 2012-04-08, at 1:19 PM, Thomas Tschofenig wrote:

> Hello,
> 
> in the last few weeks I`ve taken a clooser look on Ruby and I am
> actually impressed on how helpful this "toolset" is.
> 
> However, prior to ruby I was mainly working with functional languages
> like ASP and PHP for web development.
> 
> So my question to you is an archtictural one, as i`m having some
> difficulties on how to implement the MVC model correctly:
> 
> Let`s say I have a model "Car" and "Part". A car can have one or more
> parts (m:n).
> 
> On a specific page the user should be able to change the cars details
> and it`s parts (add part, remove part, set quantity etc.).
> 
> How would you implement the controllers ?
> 
> I would have used the following approach but ran into several problems:
> 
> CarsController
> --> index
> --> show
> --> new (needs PartsController/index to display parts)
> --> create
> --> edit
> --> update
> 
> PartsController
> --> index (displays all parts of a car)
> --> show (displays single part of a car)
> --> new (add part)
> --> create
> --> edit (set quantity)
> --> update
> 
> When I tried to embed the template of "PartsController/index" into the
> template "CarsController/new" by using the "render" helper in the
> template it doesn`t work.
> 
> Example (CarsController/new.html.erb): <%= render @car.pars %> // empty
> output
> 
> Is this approach the most common way to implement this or I am wrong ?
> IF it is correct how do I include another action of another controller
> in a view ?
> 
> Please be kind, I am a newbie trying the (correct) MVC way...

This looks like a Rails question, and one place to start looking for Rails answers is at http://railscasts.com.  Does http://railscasts.com/episodes/196-nested-model-form-part-1 give you any ideas?

Regards,

Mike

-- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.