Rails 3, how to setup has_many form and Controller action

Question

I have these Models

class User #( Devise)
  has_many :codes 
  has_many :redemptions
end

class Code
  belongs_to :band
  belongs_to :user
  has_many :redemptions
end

class Redemption
  has_one :code
  belongs_to :user
end

class Band
  has_many :codes
end

I am trying to do most of the work in the Band#show view. So I have a band_controller action redeem.

My goal is that the current_user (provided by devise) inputs a code into a form input (created by another user) and submits to the Band#redeem action and puts the user_id and code_id into a redeem object. This creates a redemption.

The crazy piece of this is that one user creates a code, another redeems it. I have the Redemption model built.

<%= form_for @band, :url => {:action => "redeem"}, do |f|  %>
  <%#= f.text_field  :code  %>
  <%= f.submit 'Submit' %>
<% end %> 

It's the current form I have setup. This obviously doesn't work but it's what I am trying to wire up.

Answer 1

Instead of having a redeem-action on BandsController, I suggest you simply use RedemptionsController#create. Something like the following:

class BandsController < ApplicationController
  def show
    @band       = Band.find(params[:id])
    @redemption = Redemption.new(code: @band.codes.first)
  end
end

# in bands/show template
<%= form_for @redemption do |f| %>
  <%= f.hidden_field :code_id %>
  <%= f.submit "Redeem now" %>
<% end %>

This form will POSTto RedemptionsController#create where you simply create the redemption.