Question

Statement

Imagine we have an inventory app, there it is a Movement model, it represent any movement like products purchase or products sale. So we have default REST routes.

    movements GET    /movements(.:format)          {:action=>"index", :controller=>"movements"}
              POST   /movements(.:format)          {:action=>"create", :controller=>"movements"}
 new_movement GET    /movements/new(.:format)      {:action=>"new", :controller=>"movements"}
edit_movement GET    /movements/:id/edit(.:format) {:action=>"edit", :controller=>"movements"}
     movement GET    /movements/:id(.:format)      {:action=>"show", :controller=>"movements"}
              PUT    /movements/:id(.:format)      {:action=>"update", :controller=>"movements"}
              DELETE /movements/:id(.:format)      {:action=>"destroy", :controller=>"movements"}

For mnemonic proposes, we want to have some descriptive routes, like:

 new_purchase        /purchase/new(.:format)       {:controller=>"movements", :action=>"new_purchase"}
edit_purchase        /purchase/:id/edit(.:format)  {:controller=>"movements", :action=>"edit_purchase"}

If you can see purchase‘s are same model likemovement‘s, actually are processed by MovementsController, but there with have different flow and treatment, this specified by create_purchase instead of create.

Questions

1. How should I add restful routes for purchase‘s? Taking care of specify HTTP methods like GET, POST, PUT, DELETE, etc.

2. How should I write form_for tags? Using movement model we can write: <%= form_for(@movement) do |f| %> but how is to call purchase paths for create or update methods?

3. How should I specify validation rules for purchase‘s? I have specified some rules on Movement model, but they are not applied for purchase‘s when a form is submitted.

Answer 1

You could use some thing like this in your routes file

 match '/purchase/new(.:format)' => 'movements#new_purchase'     :via => :get
 match '/purchase/:id/edit(.:format)' => 'movements#edit_purchase' :via => :post 

and you can mention others like delete, put in :via

for more info look at this link
If you want to change create to create_purchases go to the movements controller and change the definition names.

for the second question you could do something like this

form_tag(:controller => "controller_name", :action => "action_name", :method => "get")