Cocoon gem, collection_select don't work with drink_id - ruby-on-rails

Question

I've the structure using Cocoon gem, in my app/views/order/_form.html.erb the code below work fine:
<%= f.collection_select(:drink_id, #drinks, :id, :name, :prompt => "Select a drink") %>
But when I using in _drink_fields.html.erb don't work, return this:
undefined method `drink_id' for # Drink:0x007fd30f9799f8
app/views/orders/_drink_fields.html.erb
<div class='nested-fields'>
<div class="field">
<%= f.collection_select(:drink_id, #drinks, :id, :name, prompt: 'Select a drink') %>
</div>
<%= link_to_remove_association "remove", f %>
</div>
app/views/orders/_form.html.erb
<hr>
<h3>Drinks</h3>
<div id='drinks'>
<%= f.fields_for :drinks do |drink| %>
<%= render 'drink_fields', :f => drink %>
<% end %>
<div class='links'>
<%= link_to_add_association 'add', f, :drinks %>
</div>
</div>
<hr>
app/views/models/order.rb
class Order < ApplicationRecord
belongs_to :drink, optional: true
has_many :drinks
accepts_nested_attributes_for :drinks, allow_destroy: true
end
app/controllers/orders_controller.rb
def set_order
#order = Order.find(params[:id])
end
def set_drink
#drinks = Drink.all
end
# Never trust parameters from the scary internet, only allow the white list through.
def order_params
params.require(:order).permit(:number, :drink_id, drinks_attributes: [:id, :name, :_destroy])
end
Why I received it?
How to do work fine?
Thanks guys!!

Answer 1

When checking your association I think you made a mistake there. I see the following
An order belongs to drink
An order has-many drinks
So then follows: A drink belongs-to order then. So a drink can be in only one order?
My guess is you are missing a join table between order and drinks. So add a simple
class OrderedDrink < ActiveRecord::Base
belongs_to :order
belongs_to :drink
end
You also need the table, so you will have to add a migration to make it (obviously).
(you could an amount there: they ordered 5 cola's for instance).
Then in Order you get
class Order
has_many :ordered_drinks, inverse_of: :order
has_many :drinks, through: :ordered_drinks
accepts_nested_attributes_for :ordered_drinks
end
In Drink you write
class Drink
has_many :ordered_drinks
has_many :orders, through: :ordered_drinks
end
(you might not need those relations, to know in how many orders a drink was/is)
And then instead of editing/managing the drinks association, you edit the ordered_drinks and your partial/collection-select will behave as expected.

Answer 2

The reason it doesn't work is because, there is no drink_id method (Which should be correspondent with drink_id column in database) on #drinks object. You probably want to use :id instead of :drink_id

Answer 3

Thank you everyone that helped to solve this trouble, in especially #nathanvda.
My mistake was forget a table to join drink and order, so I recreated the project and besides that drink and order table, I created a ordereddrink table like #nathanvda answered.
app/models/order.rb
has_many :ordered_drinks, inverse_of: :order
has_many :feeds, through: :ordered_drinks
accepts_nested_attributes_for :ordered_drinks, allow_destroy: true
app/controllers/orders_controller.rb
before_action :set_drink, only: [:new, :edit, :update, :destroy]
def set_drink
#drinks = Drink.all
end
def order_params
params.require(:order).permit(:number, ordered_drinks_attributes: [:id, :order_id, :drink_id, :_destroy, drinks_attributes: [:id, :name, :_destroy]])
end
app/views/orders/_form.html.erb
<hr>
<h3>Drinks</h3>
<div id='ordered_drinks'>
<%= f.fields_for :ordered_drinks do |ordered_drink| %>
<%= render 'ordered_drink_fields', :f => ordered_drink %>
<% end %>
<div class='links'>
<%= link_to_add_association 'add drink', f, :ordered_drinks %>
</div>
</div>
<hr>
app/views/orders/_ordered_drink_fields.html.erb
<div class='nested-fields'>
<div class="field">
<%= f.collection_select(:drink_id, #drinks, :id, :name, include_blank: false) %>
</div>
<%= link_to_remove_association "remove drink", f %>
</div>
If anyone had the same trouble, contact me or send a message.