请帮我修复此错误：
Quantifieds #index中的NoMethodError 未定义的方法`结果＆＃39;为零：NilClass
我是一个新手，所以希望这会花费你更少的时间，让你更愉快地解决。
完整跟踪
我提供了很多代码，因为我不知道问题有多深。我在网站中花了20多个小时试图修复它而没有运气。然而，我仍然认为解决方案很简单我只需要有新眼睛和更多经验的人。
重述问题，如何定义date_value＆amp; result_value所以它在quantieds索引中有效吗？
<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">
<% @quantifieds.results.each do |result| %>
<%= result.date_value.strftime("%m-%Y") %>
<%= result.result_value %>
<% end %>
</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">
<% @quantifieds.results.each do |result| %>
<%= result.date_value.strftime("%m-%Y") %>
<%= result.result_value %>
<% end %>
</tbody>
<% end %>
<% end %>
</table>
<%= link_to new_quantified_path, class: 'btn' do %>
<b><span class="glyphicon glyphicon-plus"</span></b>
<% end %>
date_value＆amp; result_value派生自：_form中的结果。我使用 cocoon 来创建我的嵌套属性。
<%= 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>
我是否需要更改控制器中的任何内容？
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
这里有更多代码可以提供更多背景信息：
的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
提前感谢您的帮助。非常感谢！
完整跟踪到新的错误消息：
activerecord (4.2.0.rc3) lib/active_record/relation/delegation.rb:136:in `method_missing'
activerecord (4.2.0.rc3) lib/active_record/relation/delegation.rb:99:in `method_missing'
app/views/quantifieds/index.html.erb:18:in `block in _app_views_quantifieds_index_html_erb__3823335262543476951_70160225385540'
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__3823335262543476951_70160225385540'
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'
答案 0 :(得分：0)
在您的视图中，您使用以下内容进行迭代：
@quantifieds.results.each do |result|
在您的索引操作中
@quantified = Result.order("date_value").all
我想它应该是
@quantifieds = Result.order("date_value").all