Question

I’m trying to build a simple nested form, checking a lot of resources online, but can’t find what is it that I’m missing!
I have the following:

class Configuration < ActiveRecord::Base
  has_many :configoptions
  accepts_nested_attributes_for :configoptions
end

class Configoption < ActiveRecord::Base
  belongs_to :configuration
  has_many :items
end

Now, I’m trying to make a simple form when you select a configuration so it would show the
configoptions belonging to it, but nothing works!

This is the view without any html

  <%= form_for :config do |f| %>
    <%= f.text_field(:name)%>
    <% f.fields_for @options do |option|%>
    <% end %>
  <% end %>

In the controller I have:

  def show
    @config = Configuration.find(params[:id])
    @options = @config.configoptions
  end

But i end up getting the error:

undefined method `model_name' for Array:Class

Does anyone have advice for me? Thanks a lot!

Answer 1

FYI, Ryan Bates (RailsCasts) has created a gem to handle much of this. I’m using it now and it works great!

See https://github.com/reu/simple_nested_form for the details.