Find object by ID in Rails 4 App

Question

I've built a wizard in my rails 4 app using Wicked. I've specifically followed this guide, the only difference is I'm doing this with a nested resource. I'm having difficulties with my controller actions that are supposed to find the object the form is building using its ID.

The current flow of the app is a user clicks a button that creates the object and is redirected to the first step of the wizard which updates the object throughout a series of steps. The problem is I'm not passing the object's ID through the parameters because I'm passing the wizard's step in the ID field.

Button that creates object

<%= link_to business_loan_application_path(@user), method: :post, :class => "btn btn-success" do %><% end
%>

LoanApplication Controller

    def create
      @user = current_user
      @loanapplication = @user.loan_applications.new
      @loanapplication.save(validate: false)
      redirect_to business_loan_application_wizard_path(@user.id,LoanApplication.form_steps.first)
    end

I need to somehow pass the :loan_application_id into the business_loan_application_wizard_path arguments.

Error

Couldn't find LoanApplication without an ID

LoanApplication belongs_to Business through has_many relationship.

{"business_id"=>"55", "id"=>"business_details"}

business_details is the first step in the wizard. These are the params that are passed when I first create the object via a button with a put request.

Wizard Controller

class WizardController < ApplicationController
  include Wicked::Wizard
  before_filter :authenticate_user!
  before_filter :require_business

  steps *LoanApplication.form_steps

  def show
    @business = current_user
    @loanapplication = LoanApplication.find(params[:loan_application_id])
    render_wizard
  end

  def update
    @business = current_user
    @loanapplication = @business.loan_applications.last
    @loanapplication.update_attributes(loan_application_params(step))
    render_wizard @loanapplication
  end
end

`routes.rb` would be really helpful here! – Yan Foto Feb 13 '15 at 16:38 — Yan Foto, Feb 13 '15 at 16:38

score 0 · Accepted Answer · edited May 23 '17 at 11:43

The discussion in this question helped solve this problem.

Changed

resources :wizard

To

scope "loan_application/:loan_application_id" do
  resources :wizard
end

In my routes.rb file.

My Wizard controller is now the following:

def show
  @business = current_user
  @loanapplication = LoanApplication.find(params[:loan_application_id])
  render_wizard
end

def update
  @business = current_user
  @loanapplication = LoanApplication.find(params[:loan_application_id])
  @loanapplication.update_attributes(loan_application_params(step))
  render_wizard @loanapplication
end

Finally, the loan application controller redirect link has been changed:

def create
  @user = current_user
  @loanapplication = @user.loan_applications.new
  @loanapplication.save(validate: false)
  redirect_to business_loan_application_wizard_path(@user.id, LoanApplication.form_steps.first, :loan_application_id => @loanapplication.id) 
end

Find object by ID in Rails 4 App

1 Answers1