CODEWITHSUNDEEP
ruby-on-railsrails-activerecord
Sauron
Sauron

Reputation: 6657

Cannot find restaurant without id, how to submit form and pass parameters

I am attempting to allow a user to create a campaign given they have selected a certain restaurant, the models are:

class Restaurant < ActiveRecord::Base

    belongs_to :user
    validates  :user_id, presence: true

    has_many :campaigns, dependent: :destroy
end

class Campaign < ActiveRecord::Base
    belongs_to :restaurant
end

That said, I have the methods in the Campaigns controller to create a new campaign and then to build (below).

    def new
        if signed_in?
            # create new campaign
            @campaign = Restaurant.find(params[:id]).campaigns.new
        else
            redirect_to signin_path
        end
    end

    def create

        @campaign = Restaurant.find(params[:restaurant_id]).campaigns.build(campaign_params)

        if @campaign.save
            flash[:success] = "Campaign created!"
            redirect_to current_user
        else
            render 'new'
        end
    end

The user progress in the app essentially is: While on the restaurant show page the user clicks on create a campaign, accessing the new method in campaign controller. The view for a new campaign, without the partial, is below and as can be seen it accepts the @campaign from new. 

<h1>New Campaign</h1>

<div class="row"> 
        <div class="span6 offset3">
        <%= nested_form_for @campaign do |f| %>
            <%= render 'parameters', f: f %>
            <div class="span6 pull-right" style="text-align:right">
                <%= f.submit "Submit", class: "btn btn-large btn-primary" %>
            </div>
        <% end %>
    </div>
</div>

As I attempt to submit the form, the error arises with the campaign controllers create method at @campaign = Restaurant.find(params[:restaurant_id]).campaigns.build(campaign_params) noting Couldn't find Restaurant without an ID

As displayed, the campaign belongs to a restaurant with the id in campaign models field :restaurant_id

How can I make this work to pass the restaurants id so the campaign can be created?

Upvotes: 0

Views: 126

Answers (1)

johndavid400
johndavid400

Reputation: 1582

To add a parameter to a form, use the hidden_field helper just above the submit tag:

<%= f.hidden_field :restaurant_id, @campaign.restaurant.id %>
<%= f.submit "Submit", class: "btn btn-large btn-primary" %>

This should be available in the create method of your controller as:

params["campaign"]["restaurant_id"]

If you for some reason want it to come in simply as params["id"], you would need to use a hidden_field_tag like so:

<%= hidden_field_tag :id, @campaign.restaurant.id %>

Side note - for debugging, you should use the debugging tool called "pry". This will change your life.

Simply add to your Gemfile:

gem 'pry'

then bundle and restart your server:

bundle
rails s

Then put a 'binding.pry' anywhere you want (in a view, model, helper, or controller) - the server will pause at the place where you put the binding.pry and you can poke around in the server console.

I would put the binding.pry right inside your create method:

def create
  binding.pry
  # rest of code here
end

Then submit the form like normal, and check your server screen in the terminal... you should see the Pry prompt.

Type:

params

to see all of the parameters coming through the form submit. to exit, type exit or ctrl+c

Remember to remove the binding.pry when you are done!!!

Upvotes: 1

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