CODEWITHSUNDEEP
ruby-on-railsrubysimple-formnested-forms
bwest87
bwest87

Reputation: 1233

Can't convert symbol to integer error with rails simple_form nested attributes

I've seen many similar questions, and looked at the answers, but nothing seems to be helping me and I've been working on this for a while now. The error is 'Can't convert symbol into integer'. My goal is to be able to create multiple sub_groups for each race. I'm just starting with trying to create one for the time being. Here's the relevant code...

** UPDATE **

VIEW

<%= simple_form_for(@race, :url => form_path, :method => form_method, :html => { :class =>  
'form-horizontal form-compressed' }) do |f| %>

<fieldset>
<%= f.simple_fields_for :sub_groups do |g| %>
  <%= g.input :name, requred: false %>
  <%= g.collection_radio_buttons :discount_type,
                                 [['dollars', '$'], ['percent', '%']], :first, :last %>
  <%= g.input :discount_amount, :as => :integer, required: false %>
<% end %>
<hr/>

** RACE MODEL**

class Race < ActiveRecord::Base
has_many :sub_groups
accepts_nested_attributes_for :sub_groups
attr_accessible :sub_groups_attributes

** SUB_GROUP MODEL **

class SubGroup < ActiveRecord::Base
  belongs_to :race
  has_many :race_users

  attr_accessible :discount_amount, :discount_type, :display_results, :name
end

PARAMS after my code update...

Parameters: {"utf8"=>"✓",    
"authenticity_token"=>"VihBL4TDT/Lte4YBji/4fp4XvOri1UgUZ8B33wQuCko=", "race"=>
{"sub_group"=>{"name"=>"dfd", "discount_type"=>"dollars", "discount_amount"=>"2"}},  
"commit"=>"Next", "wizard"=>"2", "id"=>"13-test5"}

CONTROLLER

class RacesController < ApplicationController
  def new
    @race = Race.new
    @sub_groups = @race.sub_groups.build
    @wizard_step = -1
    @wizard_step_name = Race.wizard_step_name_from_id @wizard_step
    @wizard_mode = true
    render :layout => "race_wizard"
  end
def update
  @race = Race.find params[:id]
  @wizard_step = params[:wizard].to_i + 1
  @race.wizard_step = @wizard_step
  @race.update_attributes(params[:race])
end

So I took advice from answer 1, and switched to using :sub_groups in the view. Now I have a new problem, which is the sub-group fields don't show up at all, despite the fact that I built a sub_groups thing in the #new method. I'm really stumped on how I can make this happen. This is driving me bonkers. Any help is much appreciated. Thanks!

Upvotes: 0

Views: 1151

Answers (1)

BroiSatse
BroiSatse

Reputation: 44715

The way fields_for works is that if you supply a symbol it checks whether your model respond to {given_symbol}_attributes=. If it does the name of sub-fields is {given symbol}_attributes, otherwise just {given_symbol}.

What you need is to add accepts_nested_attributes_for :sub_groups to your Race model. This methods will create a default setter sub_groups_attributes=, which will make fields_for :sub_groups to generate fields with name sub_groups_attributes.

You can also write your own sub_groups_attributes= method, but you need to be sure you know what you're doing there as it might be a little tricky to debug.

Note, that fields_to :sub_groups won't display fields if there are no sub_group associated with given object - you will need to build one in your controller first.

Upvotes: 1

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