索引中的NoMethodError：如何定义嵌套属性？
NoMethodError in Index: How to Define the Nested Attributes?
量化中没有方法错误#index
#Quantified:0x007ff3fe7d6c08
的未定义方法“date_value”
如何定义 date_value 和 result_value 以便它在量化索引中起作用？
<!-- Default bootstrap panel contents -->
<div id="values" class="panel panel-default">
<div class="panel-heading"><h4><b>AVERAGE</b></h4></div>
<!-- Table -->
<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>
</div>
<br>
<br>
<br>
<br>
<!-- Default bootstrap panel contents -->
<div id="values" class="panel panel-default">
<div class="panel-heading"><h4><b>INSTANCE</b></h4></div>
<!-- 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>
</div>
<div class="values-button">
<%= link_to new_quantified_path, class: 'btn' do %>
<b><span class="glyphicon glyphicon-plus"</span></b>
<% end %>
</div>
date_value & result_value 派生自 f.simple_fields_for :_form 中的结果。我正在使用 cocoon 来创建我的嵌套属性。
= simple_form_for @quantified do |f|
.america
%form
= f.select :categories, Quantified::CATEGORIES
%br/
%br/
.form-group
= f.text_field :name, class: 'form-control', placeholder: 'Enter Name'
.form-group
= f.text_field :metric, class: 'form-control', placeholder: 'Enter Metric'
#results
= f.simple_fields_for :results do |result|
= render 'result_fields', :f => result
= link_to_add_association 'Add Result', f, :results
%br/
= button_tag(type: 'f.submit', class: "btn") do
%span.glyphicon.glyphicon-plus
.nested-fields
.form-group
= f.text_field :result_value, class: 'form-control', placeholder: 'Enter Result'
%br
= f.date_select :date_value, :order => [:month, :year], class: 'date-select'
= link_to_remove_association "Remove Result", f
我想解决办法可能是改变控制器：
class QuantifiedsController < ApplicationController
before_action :set_quantified, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
@quantified = Result.all.order("date_value")
@averaged_quantifieds = current_user.quantifieds.averaged
@instance_quantifieds = current_user.quantifieds.instance
end
def show
end
def new
@quantified = current_user.quantifieds.build
@quantified.results.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
这里有一些代码可以提供更多上下文：
routes.rb
Rails.application.routes.draw do
resources :goals
resources :values
resources :quantifieds do
resources :results
end
devise_for :users
root 'values#index'
get "about" => "pages#about"
schema.rb
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20150123210404) do
create_table "goals", force: true do |t|
t.string "name"
t.date "deadline"
t.boolean "accomplished", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end
add_index "goals", ["deadline"], name: "index_goals_on_deadline"
add_index "goals", ["user_id"], name: "index_goals_on_user_id"
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", ["quantified_id"], name: "index_results_on_quantified_id"
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_table "values", force: true do |t|
t.string "name"
t.string "categories"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end
add_index "values", ["categories"], name: "index_values_on_categories"
add_index "values", ["user_id"], name: "index_values_on_user_id"
end
_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
完整跟踪
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'
如果您需要更多代码或评论来解决此问题，请告诉我。神速.
您具体问题的答案：
在您的索引操作中，您有：
@quantified = Result.all.order("date_value")
调用.allbefore.order是原因你的错误。
在 Rails ActiveRecord 中，.all 命令 立即 触发从数据库中获取项目。
由于 .where 和 .order 等数据库 IO 提取命令的存在决定了从数据库中提取数据的方式（或内容），因此您需要在代码中调用它们 在数据库检索被 .all 这样的命令触发 之前：
@quantified = Result.order("date_value").all
为了更清楚起见，最好在此查询中指定升序或降序，例如Result.order("date_value ASC").all，或者如果数据总是按此顺序使用，则使您的顺序成为 Result 模型中的 default_scope。
调试时的一般建议 Undefined Method "method_name" 错误：
在你的问题中，我注意到你没有包含受你错误影响的对象的 class 信息，因此很难正确诊断你的错误来源问题（你是否有正确的对象）。
提示：诊断错误时，首先检查对象是否存在，然后再查看错误标记的方法。
为什么？因为许多 undefined method "method_name" 错误并不是 实际上 由 method_name 是 undefined 引起的，而是因为 对象本身 是 nil 或不正确的 class.
NoMethodError: undefined method 'method_name' 可能是一个误导 当您有一个未加载或实例化的对象时会误导您。
要正确诊断 NoMethodError，必须先检查 对象的 class 是否已正确定义，然后再开始尝试调试它。如果不这样做，很容易陷入困境，调查 method_name 可能存在的问题，而真正的问题在于您的对象不存在。
要在 undefined method 错误中检查对象的 class，只需查找错误的 for xxx:Class 部分。这描述了对象及其 class。如果你的对象是 nil 或不存在，未定义的方法错误将显示 for nil:NilClass.
NoMethodError: undefined method `date_time' for nil:NilClass
不幸的是，这里很容易将注意力集中在该错误消息的 date_time 部分，而不是 NoMethodError 消息引用了 nil class。在像上面这样的 NoMethodError 中，我们的对象是 nil，'date_time' 只是表示代码中的一个点，我们在该点上未能成功调用针对 nil 对象的方法。要正确解决 nil:NilClass 对象上的 NoMethodError，重要的是调查 为什么 对象本身没有实例化。
量化中没有方法错误#index
#Quantified:0x007ff3fe7d6c08
的未定义方法“date_value”如何定义 date_value 和 result_value 以便它在量化索引中起作用？
<!-- Default bootstrap panel contents -->
<div id="values" class="panel panel-default">
<div class="panel-heading"><h4><b>AVERAGE</b></h4></div>
<!-- Table -->
<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>
</div>
<br>
<br>
<br>
<br>
<!-- Default bootstrap panel contents -->
<div id="values" class="panel panel-default">
<div class="panel-heading"><h4><b>INSTANCE</b></h4></div>
<!-- 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>
</div>
<div class="values-button">
<%= link_to new_quantified_path, class: 'btn' do %>
<b><span class="glyphicon glyphicon-plus"</span></b>
<% end %>
</div>
date_value & result_value 派生自 f.simple_fields_for :_form 中的结果。我正在使用 cocoon 来创建我的嵌套属性。
= simple_form_for @quantified do |f|
.america
%form
= f.select :categories, Quantified::CATEGORIES
%br/
%br/
.form-group
= f.text_field :name, class: 'form-control', placeholder: 'Enter Name'
.form-group
= f.text_field :metric, class: 'form-control', placeholder: 'Enter Metric'
#results
= f.simple_fields_for :results do |result|
= render 'result_fields', :f => result
= link_to_add_association 'Add Result', f, :results
%br/
= button_tag(type: 'f.submit', class: "btn") do
%span.glyphicon.glyphicon-plus
.nested-fields
.form-group
= f.text_field :result_value, class: 'form-control', placeholder: 'Enter Result'
%br
= f.date_select :date_value, :order => [:month, :year], class: 'date-select'
= link_to_remove_association "Remove Result", f
我想解决办法可能是改变控制器：
class QuantifiedsController < ApplicationController
before_action :set_quantified, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
@quantified = Result.all.order("date_value")
@averaged_quantifieds = current_user.quantifieds.averaged
@instance_quantifieds = current_user.quantifieds.instance
end
def show
end
def new
@quantified = current_user.quantifieds.build
@quantified.results.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
这里有一些代码可以提供更多上下文：
routes.rb
Rails.application.routes.draw do
resources :goals
resources :values
resources :quantifieds do
resources :results
end
devise_for :users
root 'values#index'
get "about" => "pages#about"
schema.rb
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20150123210404) do
create_table "goals", force: true do |t|
t.string "name"
t.date "deadline"
t.boolean "accomplished", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end
add_index "goals", ["deadline"], name: "index_goals_on_deadline"
add_index "goals", ["user_id"], name: "index_goals_on_user_id"
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", ["quantified_id"], name: "index_results_on_quantified_id"
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_table "values", force: true do |t|
t.string "name"
t.string "categories"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end
add_index "values", ["categories"], name: "index_values_on_categories"
add_index "values", ["user_id"], name: "index_values_on_user_id"
end
_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
完整跟踪
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'
如果您需要更多代码或评论来解决此问题，请告诉我。神速.
您具体问题的答案：
在您的索引操作中，您有：
@quantified = Result.all.order("date_value")
调用.allbefore.order是原因你的错误。
在 Rails ActiveRecord 中，.all 命令 立即 触发从数据库中获取项目。
由于 .where 和 .order 等数据库 IO 提取命令的存在决定了从数据库中提取数据的方式（或内容），因此您需要在代码中调用它们 在数据库检索被 .all 这样的命令触发 之前：
@quantified = Result.order("date_value").all
为了更清楚起见，最好在此查询中指定升序或降序，例如Result.order("date_value ASC").all，或者如果数据总是按此顺序使用，则使您的顺序成为 Result 模型中的 default_scope。
调试时的一般建议 Undefined Method "method_name" 错误：
在你的问题中，我注意到你没有包含受你错误影响的对象的 class 信息，因此很难正确诊断你的错误来源问题（你是否有正确的对象）。
提示：诊断错误时，首先检查对象是否存在，然后再查看错误标记的方法。
为什么？因为许多 undefined method "method_name" 错误并不是 实际上 由 method_name 是 undefined 引起的，而是因为 对象本身 是 nil 或不正确的 class.
NoMethodError: undefined method 'method_name' 可能是一个误导 当您有一个未加载或实例化的对象时会误导您。
要正确诊断 NoMethodError，必须先检查 对象的 class 是否已正确定义，然后再开始尝试调试它。如果不这样做，很容易陷入困境，调查 method_name 可能存在的问题，而真正的问题在于您的对象不存在。
要在 undefined method 错误中检查对象的 class，只需查找错误的 for xxx:Class 部分。这描述了对象及其 class。如果你的对象是 nil 或不存在，未定义的方法错误将显示 for nil:NilClass.
NoMethodError: undefined method `date_time' for nil:NilClass
不幸的是，这里很容易将注意力集中在该错误消息的 date_time 部分，而不是 NoMethodError 消息引用了 nil class。在像上面这样的 NoMethodError 中，我们的对象是 nil，'date_time' 只是表示代码中的一个点，我们在该点上未能成功调用针对 nil 对象的方法。要正确解决 nil:NilClass 对象上的 NoMethodError，重要的是调查 为什么 对象本身没有实例化。