Полиморфные ассоциации undefined method 'content'

Question

Я следил за этим эпизодом railscasts: http://railscasts.com/episodes/154-polymorphic-association-revised?view=comments.

И теперь получаю это:

<%= form_for [@commentable, @comment] do |f| %> 
    <% if @comment.errors.any? %> 
    <div class="error_messages"> 
     <h2>Please correct the following errors.</h2> 
     <ul> 
     <% @comment.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= f.text_area :content, rows: 8 %> 
    </div> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

Я делаю что-то неправильно в контроллере нормированиям, как с valuations_params?

class ValuationsController < ApplicationController 
    before_action :set_valuation, only: [:show, :edit, :update, :destroy] 
    before_action :logged_in_user, only: [:create, :destroy] 

    def index 
    if params[:tag] 
     @valuations = Valuation.tagged_with(params[:tag]) 
    else 
     @valuations = Valuation.order('RANDOM()') 
    end 
    end 

    def show 
    @valuation = Valuation.find(params[:id]) 
    @commentable = @valuation 
    @comments = @commentable.comments 
    @comment = Comment.new 
    end 

    def new 
    @valuation = current_user.valuations.build 
    end 

    def edit 
    end 

    def create 
    @valuation = current_user.valuations.build(valuation_params) 
    if @valuation.save 
     redirect_to @valuation, notice: 'Value was successfully created' 
    else 
     @feed_items = [] 
     render 'pages/home' 
    end 
end 

    def update 
    if @valuation.update(valuation_params) 
     redirect_to @valuation, notice: 'Value was successfully updated' 
    else 
     render action: 'edit' 
    end 
end 

    def destroy 
    @valuation.destroy 
    redirect_to valuations_url 
    end 

    private 
    def set_valuation 
     @valuation = Valuation.find(params[:id]) 
    end 

    def correct_user 
     @valuation = current_user.valuations.find_by(id: params[:id]) 
     redirect_to valuations_path, notice: "Not authorized to edit this valuation" if @valuation.nil? 
    end 

    def valuation_params 
     params.require(:valuation).permit(:name, :private_submit, :tag_list, :content, :commentable, :comment) 
    end 
end 


class CommentsController < ApplicationController 
    before_filter :load_commentable 

    def index 
     @comments = @commentable.comments 
    end 

    def new 
     @comment = @commentable.comments.new 
    end 

    def create 
     @comment = @commentable.comments.new(params[:comment]) 
     @comment.user = current_user 
     if @comment.save 
      @comment.create_activity :create, owner: current_user 
      redirect_to @commentable, notice: "comment created." 
     else 
      render :new 
     end 
    end 

    def edit 
     @comment = current_user.comments.find(params[:id]) 
    end 

    def update 
     @comment = current_user.comments.find(params[:id]) 
     if @comment.update_attributes(params[:comment]) 
      redirect_to @commentable, notice: "Comment was updated." 
     else 
      render :edit 
     end 
    end 

    def destroy 
     @comment = current_user.comments.find(params[:id]) 
     @comment.destroy 
     @comment.create_activity :destroy, owner: current_user 
     redirect_to @commentable, notice: "comment destroyed." 
    end 

private 

    def load_commentable 
     resource, id = request.path.split('/')[1, 2] 
     @commentable = resource.singularize.classify.constantize.find(id) 
    end 

    def comment_params 
     params.require(:comment).permit(:content, :commentable) 
    end 
end 


class CreateComments < ActiveRecord::Migration 
    def change 
    create_table :comments do |t| 
     t.text :content 
     t.belongs_to :commentable, polymorphic: true 

     t.timestamps null: false 
    end 
    add_index :comments, [:commentable_id, :commentable_type] 
    end 
end 

class CreateValuations < ActiveRecord::Migration 
    def change 
    create_table :valuations do |t| 
     t.string :name 
     t.boolean :private_submit 
     t.references :user, index: true 

     t.timestamps null: false 
    end 
    add_foreign_key :valuations, :users 
    add_index :valuations, [:user_id, :created_at] 
    end 
end 

class Valuation < ActiveRecord::Base 
 
\t belongs_to :user 
 
\t has_many :comments, as: :commentable 
 
    acts_as_taggable 
 
    validates :name, presence: true 
 
\t scope :private_submit, -> { where(private_submit: true) } 
 
\t scope :public_submit, -> { where(private_submit: false) } 
 
    include PublicActivity::Model 
 
    tracked owner: ->(controller, model) { controller && controller.current_user } 
 

 
    scope :randomize, -> do 
 
\t order('RANDOM()'). 
 
\t take(1) 
 
\t end 
 
end

class Comment < ActiveRecord::Base 
 
\t include PublicActivity::Common 
 
\t # tracked except: :update, owner: ->(controller, model) { controller && controller.current_user } 
 
\t belongs_to :commentable, polymorphic: true 
 
end

Полный след

activemodel (4.2.0.rc3) lib/active_model/attribute_methods.rb:433:in `method_missing' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/base.rb:28:in `public_send' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/base.rb:28:in `value' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/base.rb:37:in `value_before_type_cast' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/text_area.rb:17:in `block in render' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/text_area.rb:17:in `delete' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/tags/text_area.rb:17:in `render' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/form_helper.rb:886:in `text_area' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/form_helper.rb:1322:in `text_area' 
 
app/views/comments/_form.html.erb:14:in `block in _app_views_comments__form_html_erb__170709608867418685_70276962559280' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/capture_helper.rb:38:in `block in capture' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/capture_helper.rb:200:in `with_output_buffer' 
 
haml (4.0.6) lib/haml/helpers/action_view_xss_mods.rb:5:in `with_output_buffer_with_haml_xss' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/capture_helper.rb:38:in `capture' 
 
haml (4.0.6) lib/haml/helpers/action_view_mods.rb:52:in `capture_with_haml' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/form_helper.rb:444:in `form_for' 
 
haml (4.0.6) lib/haml/helpers/action_view_mods.rb:139:in `form_for_with_haml' 
 
haml (4.0.6) lib/haml/helpers/action_view_xss_mods.rb:28:in `form_for_with_haml_xss' 
 
app/views/comments/_form.html.erb:1:in `_app_views_comments__form_html_erb__170709608867418685_70276962559280' 
 
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/partial_renderer.rb:339:in `render_partial' 
 
actionview (4.2.0.rc3) lib/action_view/renderer/partial_renderer.rb:310:in `block in render' 
 
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/partial_renderer.rb:309:in `render' 
 
actionview (4.2.0.rc3) lib/action_view/renderer/renderer.rb:47:in `render_partial' 
 
actionview (4.2.0.rc3) lib/action_view/helpers/rendering_helper.rb:35:in `render' 
 
haml (4.0.6) lib/haml/helpers/action_view_mods.rb:12:in `render_with_haml' 
 
app/views/valuations/show.html.erb:13:in `_app_views_valuations_show_html_erb___1405174294651949311_70276963239480' 
 
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: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: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: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' 
 
omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!' 
 
omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call' 
 
omniauth (1.2.2) lib/omniauth/builder.rb:59: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'

Спасибо за ваше время.

Answer 1

Как я уже сказал, поле :content не указано для вашей таблицы comments.

Вы можете увидеть это на консоли рельсов: Comment.new.respond_to?(:content), если он отвечает false.

Если у вас есть проблемы с миграцией, исправьте их и заново создайте db с нуля: отбросьте db, удалите файл schema.rb и rake db: migrate.

Это также работает, если ваши миграции в порядке, и у вас возникла проблема с вашим schema.rb.

Редактировать: когда я проверить ваш код, который я видел в вашем CommentsController в действиях: create и update вы используете params[:comment] для обновления. Я думаю, вы хотите использовать метод comment_params.