Undefined Nested Attribute! How to Fix it?

Question

After a few days of attempting to solve this I still get this error:

NoMethodError in Quantifieds#index undefined method `date_value' for #Quantified:0x007ff3fe7d6c08

I am a novice so hopefully this will take you far less time and be far more pleasurable to solve.

Full trace below

How do I define date_value & result_value so it works in the quantifieds index?

 <table> <% @averaged_quantifieds.each do |averaged| %> <% if averaged.user == current_user %> <th class="value"> <%= link_to edit_quantified_path(averaged) do %> <%= averaged.name %> <% end %> (<%= averaged.metric %>) </th> <tbody class="value"> <td><%= averaged.date_value.strftime("%m-%Y") %></td> <td><%= averaged.result_value %></td> </tbody> <% end %> <% end %> </table> <table> <% @instance_quantifieds.each do |instance| %> <% if instance.user == current_user %> <th class="value"> <%= link_to edit_quantified_path(instance) do %> <%= instance.name %> <% end %> (<%= instance.metric %>) </th> <tbody class="value"> <td><%= instance.date_value.strftime("%m-%Y") %></td> <td><%= instance.result_value %></td> </tbody> <% end %> <% end %> </table> <%= link_to new_quantified_path, class: 'btn' do %> <b><span class="glyphicon glyphicon-plus"</span></b> <% end %> 

date_value & result_value are derived from :results in the _form. I am using cocoon to create my nested attributes.

 <%= form_for @quantified do |f| %> <%= f.select :categories, Quantified::CATEGORIES %> <%= f.text_field :name, class: 'form-control', placeholder: 'Enter Name' %> <%= f.text_field :metric, class: 'form-control', placeholder: 'Enter Metric' %> <%= f.fields_for :results do |result| %> <%= render 'result_fields', :f => result %> <% end %> <%= link_to_add_association 'add result', f, :results %> <%= f.submit %> <% end %> 

 <div class="nested-fields"> <%= f.text_field :result_value, class: 'form-control', placeholder: 'Enter Result' %> <%= f.date_select :date_value, :order => [:month, :year], class: 'date-select' %> <%= link_to_remove_association "Remove Result", f %> </div> 

I think the solution maybe found in altering the controller:

 class QuantifiedsController < ApplicationController before_action :set_quantified, only: [:show, :edit, :update, :destroy] before_action :authenticate_user!, except: [:index, :show] def index @quantified = Result.order("date_value").all @averaged_quantifieds = current_user.quantifieds.averaged @instance_quantifieds = current_user.quantifieds.instance end def show end def new @quantified = current_user.quantifieds.build end def edit end def create @quantified = current_user.quantifieds.build(quantified_params) if @quantified.save redirect_to quantifieds_url, notice: 'Quantified was successfully created' else render action: 'new' end end def update if @quantified.update(quantified_params) redirect_to quantifieds_url, notice: 'Goal was successfully updated' else render action: 'edit' end end def destroy @quantified.destroy redirect_to quantifieds_url end private def set_quantified @quantified = Quantified.find(params[:id]) end def correct_user @quantified = current_user.quantifieds.find_by(id: params[:id]) redirect_to quantifieds_path, notice: "Not authorized to edit this goal" if @quantified.nil? end def quantified_params params.require(:quantified).permit(:categories, :name, :metric, :result, :date, results_attributes: [:id, :result_value, :date_value, :_destroy]) end end 

Here's some more code to give more context:

routes.rb

 Rails.application.routes.draw do resources :goals resources :values resources :quantifieds resources :results devise_for :users root 'values#index' get "about" => "pages#about" 

schema.rb

 ActiveRecord::Schema.define(version: 20150123210404) do create_table "quantifieds", force: true do |t| t.string "categories" t.string "name" t.string "metric" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.integer "user_id" end add_index "quantifieds", ["categories"], name: "index_quantifieds_on_categories" add_index "quantifieds", ["user_id"], name: "index_quantifieds_on_user_id" create_table "results", force: true do |t| t.string "result_value" t.date "date_value" t.integer "quantified_id" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.integer "user_id" end add_index "results", ["date_value"], name: "index_results_on_date_value" add_index "results", ["user_id"], name: "index_results_on_user_id" create_table "users", force: true do |t| t.string "email", default: "", null: false t.string "encrypted_password", default: "", null: false t.string "reset_password_token" t.datetime "reset_password_sent_at" t.datetime "remember_created_at" t.integer "sign_in_count", default: 0, null: false t.datetime "current_sign_in_at" t.datetime "last_sign_in_at" t.string "current_sign_in_ip" t.string "last_sign_in_ip" t.datetime "created_at" t.datetime "updated_at" t.string "name" end add_index "users", ["email"], name: "index_users_on_email", unique: true add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true 

_create_results.rb

 class CreateResults < ActiveRecord::Migration def change create_table :results do |t| t.string :result_value t.date :date_value t.belongs_to :quantified, index: true t.timestamps null: false end add_foreign_key :results, :quantifieds end end 

_add_user_id_to_results.rb

 class AddUserIdToResults < ActiveRecord::Migration def change add_column :results, :user_id, :integer add_index :results, :user_id end end 

quantified.rb

 class Quantified < ActiveRecord::Base belongs_to :user scope :averaged, -> { where(categories: 'averaged') } scope :instance, -> { where(categories: 'instance') } has_many :results accepts_nested_attributes_for :results, :reject_if => :all_blank, :allow_destroy => true CATEGORIES = ['averaged', 'instance'] end 

result.rb

 class Result < ActiveRecord::Base belongs_to :user belongs_to :quantified end 

Full trace

 activemodel (4.2.0.rc3) lib/active_model/attribute_methods.rb:433:in `method_missing' app/views/quantifieds/index.html.erb:18:in `block in _app_views_quantifieds_index_html_erb__3407997734302574408_70263238235460' activerecord (4.2.0.rc3) lib/active_record/relation/delegation.rb:46:in `each' activerecord (4.2.0.rc3) lib/active_record/relation/delegation.rb:46:in `each' app/views/quantifieds/index.html.erb:9:in `_app_views_quantifieds_index_html_erb__3407997734302574408_70263238235460' actionview (4.2.0.rc3) lib/action_view/template.rb:145:in `block in render' activesupport (4.2.0.rc3) lib/active_support/notifications.rb:166:in `instrument' actionview (4.2.0.rc3) lib/action_view/template.rb:333:in `instrument' actionview (4.2.0.rc3) lib/action_view/template.rb:143:in `render' actionview (4.2.0.rc3) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template' actionview (4.2.0.rc3) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument' activesupport (4.2.0.rc3) lib/active_support/notifications.rb:164:in `block in instrument' activesupport (4.2.0.rc3) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.2.0.rc3) lib/active_support/notifications.rb:164:in `instrument' actionview (4.2.0.rc3) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument' actionview (4.2.0.rc3) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template' actionview (4.2.0.rc3) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout' actionview (4.2.0.rc3) lib/action_view/renderer/template_renderer.rb:52:in `render_template' actionview (4.2.0.rc3) lib/action_view/renderer/template_renderer.rb:14:in `render' actionview (4.2.0.rc3) lib/action_view/renderer/renderer.rb:42:in `render_template' actionview (4.2.0.rc3) lib/action_view/renderer/renderer.rb:23:in `render' actionview (4.2.0.rc3) lib/action_view/rendering.rb:100:in `_render_template' actionpack (4.2.0.rc3) lib/action_controller/metal/streaming.rb:217:in `_render_template' actionview (4.2.0.rc3) lib/action_view/rendering.rb:83:in `render_to_body' actionpack (4.2.0.rc3) lib/action_controller/metal/rendering.rb:32:in `render_to_body' actionpack (4.2.0.rc3) lib/action_controller/metal/renderers.rb:37:in `render_to_body' actionpack (4.2.0.rc3) lib/abstract_controller/rendering.rb:25:in `render' actionpack (4.2.0.rc3) lib/action_controller/metal/rendering.rb:16:in `render' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render' activesupport (4.2.0.rc3) lib/active_support/core_ext/benchmark.rb:12:in `block in ms' /Users/galli01anthony/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/benchmark.rb:294:in `realtime' activesupport (4.2.0.rc3) lib/active_support/core_ext/benchmark.rb:12:in `ms' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:41:in `block in render' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime' activerecord (4.2.0.rc3) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:40:in `render' actionpack (4.2.0.rc3) lib/action_controller/metal/implicit_render.rb:10:in `default_render' actionpack (4.2.0.rc3) lib/action_controller/metal/implicit_render.rb:5:in `send_action' actionpack (4.2.0.rc3) lib/abstract_controller/base.rb:198:in `process_action' actionpack (4.2.0.rc3) lib/action_controller/metal/rendering.rb:10:in `process_action' actionpack (4.2.0.rc3) lib/abstract_controller/callbacks.rb:20:in `block in process_action' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:117:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:117:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:151:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:151:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:234:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:234:in `block in halting' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:234:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:234:in `block in halting' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `block in halting' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `block in halting' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:169:in `block in halting' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:92:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:92:in `_run_callbacks' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:734:in `_run_process_action_callbacks' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (4.2.0.rc3) lib/abstract_controller/callbacks.rb:19:in `process_action' actionpack (4.2.0.rc3) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' activesupport (4.2.0.rc3) lib/active_support/notifications.rb:164:in `block in instrument' activesupport (4.2.0.rc3) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.2.0.rc3) lib/active_support/notifications.rb:164:in `instrument' actionpack (4.2.0.rc3) lib/action_controller/metal/instrumentation.rb:30:in `process_action' actionpack (4.2.0.rc3) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' activerecord (4.2.0.rc3) lib/active_record/railties/controller_runtime.rb:18:in `process_action' actionpack (4.2.0.rc3) lib/abstract_controller/base.rb:137:in `process' actionview (4.2.0.rc3) lib/action_view/rendering.rb:30:in `process' actionpack (4.2.0.rc3) lib/action_controller/metal.rb:195:in `dispatch' actionpack (4.2.0.rc3) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' actionpack (4.2.0.rc3) lib/action_controller/metal.rb:236:in `block in action' actionpack (4.2.0.rc3) lib/action_dispatch/routing/route_set.rb:73:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/routing/route_set.rb:73:in `dispatch' actionpack (4.2.0.rc3) lib/action_dispatch/routing/route_set.rb:42:in `serve' actionpack (4.2.0.rc3) lib/action_dispatch/journey/router.rb:43:in `block in serve' actionpack (4.2.0.rc3) lib/action_dispatch/journey/router.rb:30:in `each' actionpack (4.2.0.rc3) lib/action_dispatch/journey/router.rb:30:in `serve' actionpack (4.2.0.rc3) lib/action_dispatch/routing/route_set.rb:802:in `call' warden (1.2.3) lib/warden/manager.rb:35:in `block in call' warden (1.2.3) lib/warden/manager.rb:34:in `catch' warden (1.2.3) lib/warden/manager.rb:34:in `call' rack (1.6.0) lib/rack/etag.rb:24:in `call' rack (1.6.0) lib/rack/conditionalget.rb:25:in `call' rack (1.6.0) lib/rack/head.rb:13:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/flash.rb:260:in `call' rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context' rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/cookies.rb:560:in `call' activerecord (4.2.0.rc3) lib/active_record/query_cache.rb:36:in `call' activerecord (4.2.0.rc3) lib/active_record/connection_adapters/abstract/connection_pool.rb:647:in `call' activerecord (4.2.0.rc3) lib/active_record/migration.rb:378:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:88:in `call' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:88:in `_run_callbacks' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:734:in `_run_call_callbacks' activesupport (4.2.0.rc3) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/reloader.rb:73:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.2.0.rc3) lib/rails/rack/logger.rb:38:in `call_app' railties (4.2.0.rc3) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.2.0.rc3) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.2.0.rc3) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.2.0.rc3) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.2.0.rc3) lib/rails/rack/logger.rb:20:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.6.0) lib/rack/methodoverride.rb:22:in `call' rack (1.6.0) lib/rack/runtime.rb:18:in `call' activesupport (4.2.0.rc3) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' actionpack (4.2.0.rc3) lib/action_dispatch/middleware/static.rb:113:in `call' rack (1.6.0) lib/rack/sendfile.rb:113:in `call' railties (4.2.0.rc3) lib/rails/engine.rb:518:in `call' railties (4.2.0.rc3) lib/rails/application.rb:164:in `call' rack (1.6.0) lib/rack/lock.rb:17:in `call' rack (1.6.0) lib/rack/content_length.rb:15:in `call' rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service' /Users/galli01anthony/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service' /Users/galli01anthony/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run' /Users/galli01anthony/.rvm/rubies/ruby-2.1.3/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread' 

Thanks in advance for your help. It will be enormously appreciated!

Answer 1

From what I am seeing you are trying to access date_value from Quantified Model, where date_value is actually a part of Result Model.

Since you have Quantified has many Results

if you do following you can get all the results data for a given Quantified Object

averaged.results.each do |result| result.date_value end