Rails Nested Resource (New)

Question

So I have a nested resource, where todolist is the parent and the todoitem is the child.

resources :todolists do
    resources :todoitems 
end

I have created an Add Todo List link where it invokes new_todolist_todoitem found in routes.rb.

new_todolist_todoitem GET    /todolists/:todolist_id/todoitems/new(.:format)      todoitems#new

In my todolists/show.html.erb file, I have included this line of code:

<%= link_to 'Add Todo Item', new_todolist_todoitem_path(@todolist.id) %>

And in my todoitems/_form.html.erb, I have also included the nested parameters inside of it:

<%= form_for([@todolist, @todoitem]) do |f| %> --> Error is on this line
    <% if @todoitem.errors.any? %>
<div id="error_explanation">
  <h2><%= pluralize(@todoitem.errors.count, "error") %> prohibited this todoitem from being saved:</h2>

In my todoitems_controller.rb, I put these down for new and create methods:

  # GET /todoitems/new
  def new
    @todoitem = Todoitem.new
  end

  # POST /todoitems
  # POST /todoitems.json
  def create
    @todoitem = @todolist.todoitems.new(:todoitem_params)

    respond_to do |format|
      if @todoitem.save
        format.html { redirect_to @todoitem, notice: 'Todoitem was successfully created.' }
        format.json { render :show, status: :created, location: @todoitem }
  else
        format.html { render :new }
        format.json { render json: @todoitem.errors, status: :unprocessable_entity }
      end
    end
  end

The problem is that I keep getting an error stating:

undefined method `todoitems_path' for #<#<Class:0x007feaa79e8da8>:0x007feaa5d0d878>

If anybody has a possible solution to fix this problem or suggestions, it would be greatly appreciated. Thank you!

P.S. According to the stack trace, the Parameters Request is: {"todolist_id"=>"2"}

Uzbekjon · Accepted Answer · 2016-04-12 03:40:59Z

1

You are not setting @todolist instance variable in your controller code but you are using it in the form_for [@todolist, @todoitem] tag. Make sure you have one set in your controller. Usually it is done in the before_filter like so:

class Todoitem
  before_filter :set_todolist

  def set_todolist
    @totolist = Todolist.find(params[:todolist_id])
  end
end

answered Apr 12, 2016 at 3:40

Uzbekjon

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3 Comments

ETUDESC Over a year ago

What if I have done that already? I just forgot to include it in this question. Is there anything else that I can do? I checked if there was a spelling error, but there wasn't any... @uzbekjon

Uzbekjon Over a year ago

Alright, let's see. You are getting todoitems_path undefined error. So, this means that your code is trying to access that path. Let's figure out where exactly that's happening. Could you please include full stack trace of your error?

ETUDESC Over a year ago

Oh I'm at work right now, but I'll be happy to post it once I get back... haha @uzbekjon

jdgray · Accepted Answer · 2016-04-12 03:01:43Z

0

A couple things to note about this and hopefully it solves your issue.

In your todolists/show.html.erb, you can just pass the @todolist in your link_to

<%= link_to 'Add Todo Item', new_todolist_todoitem_path(@todolist) %>

Then some changes need to be made to your controller:

todoitems_controller.rb

before_action :set_todolist

def create
  @todoitem = Todoitem.new(todoitem_params)

  # Assuming Todoitem belongs_to Todolist
  @todoitem.todolist_id = @todolist.id
  ...
end

private

def set_todolist
  @todolist = Todolist.find(params[:todolist_id]
end

Make sure your params are correct as well.

edited Apr 12, 2016 at 3:01

answered Apr 12, 2016 at 2:56

jdgray

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