Rendering парциальное от другого контроллера разрывает приложение - неопределенный метод `текст» для # <Post :: ActiveRecord_Relation: 0x007fe74893b390>

Question

Я пытаюсь сделать партиалы с другой точкой зрения posts/_index и posts/_new и контроллер сообщений, в другой точке зрения welcome/index. Сообщения/_index загружаются отлично, но я не могу понять/понять, почему сообщения/_new вызывают ошибку для текстового метода, который определен только в миграции базы данных, который, как я думал, будет общедоступным.

Это где он ссылается на ошибку в прием/_new парциального:

<%= form_for :post, url: posts_path do |f| %> 
    <p id="post_box"> 
    <%= f.text_area :text %> 
    </p> 

    <p> 
    <%= f.submit %> 
    </p> 
<% end %> 

И это рабочие сообщения/_index парциальное:

<% post.reverse.each do |post| %> 
    <div class="panel panel-default"> 
    <div class="panel-body"> 
     <%= post.text %> 
    </div> 
    </div> 
<% end %> 

Для справки код такой же, как : Why aren't instance variables defined in a controller's methods available in the corresponding partials?

кроме controllers/welcome_controller.rb

class WelcomeController < ApplicationController 
    def new 
    end 

    def index 
    @post = Post.all 
    end 

    private 
    def post_params 
     params.require(:post).permit(:text) 
    end 
end 

Полный след:

app/views/posts/_index.html.erb:1:in `_app_views_posts__index_html_erb__2553516224846921857_70315677910360' 
actionview (4.1.7) lib/action_view/template.rb:145:in `block in render' 
activesupport (4.1.7) lib/active_support/notifications.rb:161:in `instrument' 
actionview (4.1.7) lib/action_view/template.rb:339:in `instrument' 
actionview (4.1.7) lib/action_view/template.rb:143:in `render' 
actionview (4.1.7) lib/action_view/renderer/partial_renderer.rb:306:in `render_partial' 
actionview (4.1.7) lib/action_view/renderer/partial_renderer.rb:279:in `block in render' 
actionview (4.1.7) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `block in instrument' 
activesupport (4.1.7) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `instrument' 
actionview (4.1.7) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' 
actionview (4.1.7) lib/action_view/renderer/partial_renderer.rb:278:in `render' 
actionview (4.1.7) lib/action_view/renderer/renderer.rb:47:in `render_partial' 
actionview (4.1.7) lib/action_view/renderer/renderer.rb:21:in `render' 
actionview (4.1.7) lib/action_view/helpers/rendering_helper.rb:32:in `render' 
app/views/welcome/index.html.erb:118:in `_app_views_welcome_index_html_erb___2498066675045436064_70315678370540' 
actionview (4.1.7) lib/action_view/template.rb:145:in `block in render' 
activesupport (4.1.7) lib/active_support/notifications.rb:161:in `instrument' 
actionview (4.1.7) lib/action_view/template.rb:339:in `instrument' 
actionview (4.1.7) lib/action_view/template.rb:143:in `render' 
actionview (4.1.7) lib/action_view/renderer/template_renderer.rb:55:in `block (2 levels) in render_template' 
actionview (4.1.7) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `block in instrument' 
activesupport (4.1.7) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `instrument' 
actionview (4.1.7) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument' 
actionview (4.1.7) lib/action_view/renderer/template_renderer.rb:54:in `block in render_template' 
actionview (4.1.7) lib/action_view/renderer/template_renderer.rb:62:in `render_with_layout' 
actionview (4.1.7) lib/action_view/renderer/template_renderer.rb:53:in `render_template' 
actionview (4.1.7) lib/action_view/renderer/template_renderer.rb:17:in `render' 
actionview (4.1.7) lib/action_view/renderer/renderer.rb:42:in `render_template' 
actionview (4.1.7) lib/action_view/renderer/renderer.rb:23:in `render' 
actionview (4.1.7) lib/action_view/rendering.rb:99:in `_render_template' 
actionpack (4.1.7) lib/action_controller/metal/streaming.rb:217:in `_render_template' 
actionview (4.1.7) lib/action_view/rendering.rb:82:in `render_to_body' 
actionpack (4.1.7) lib/action_controller/metal/rendering.rb:32:in `render_to_body' 
actionpack (4.1.7) lib/action_controller/metal/renderers.rb:32:in `render_to_body' 
actionpack (4.1.7) lib/abstract_controller/rendering.rb:25:in `render' 
actionpack (4.1.7) lib/action_controller/metal/rendering.rb:16:in `render' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render' 
activesupport (4.1.7) lib/active_support/core_ext/benchmark.rb:12:in `block in ms' 
/Users/lasernite/.rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/benchmark.rb:294:in `realtime' 
activesupport (4.1.7) lib/active_support/core_ext/benchmark.rb:12:in `ms' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:41:in `block in render' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime' 
activerecord (4.1.7) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:40:in `render' 
actionpack (4.1.7) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
actionpack (4.1.7) lib/action_controller/metal/implicit_render.rb:4:in `send_action' 
actionpack (4.1.7) lib/abstract_controller/base.rb:189:in `process_action' 
actionpack (4.1.7) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (4.1.7) lib/abstract_controller/callbacks.rb:20:in `block in process_action' 
activesupport (4.1.7) lib/active_support/callbacks.rb:113:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:113:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:229:in `block in halting' 
activesupport (4.1.7) lib/active_support/callbacks.rb:229:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:229:in `block in halting' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:166:in `block in halting' 
activesupport (4.1.7) lib/active_support/callbacks.rb:86:in `call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:86:in `run_callbacks' 
actionpack (4.1.7) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (4.1.7) lib/action_controller/metal/rescue.rb:29:in `process_action' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `block in instrument' 
activesupport (4.1.7) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
activesupport (4.1.7) lib/active_support/notifications.rb:159:in `instrument' 
actionpack (4.1.7) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (4.1.7) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' 
activerecord (4.1.7) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (4.1.7) lib/abstract_controller/base.rb:136:in `process' 
actionview (4.1.7) lib/action_view/rendering.rb:30:in `process' 
actionpack (4.1.7) lib/action_controller/metal.rb:196:in `dispatch' 
actionpack (4.1.7) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' 
actionpack (4.1.7) lib/action_controller/metal.rb:232:in `block in action' 
actionpack (4.1.7) lib/action_dispatch/routing/route_set.rb:82:in `call' 
actionpack (4.1.7) lib/action_dispatch/routing/route_set.rb:82:in `dispatch' 
actionpack (4.1.7) lib/action_dispatch/routing/route_set.rb:50:in `call' 
actionpack (4.1.7) lib/action_dispatch/journey/router.rb:73:in `block in call' 
actionpack (4.1.7) lib/action_dispatch/journey/router.rb:59:in `each' 
actionpack (4.1.7) lib/action_dispatch/journey/router.rb:59:in `call' 
actionpack (4.1.7) lib/action_dispatch/routing/route_set.rb:678:in `call' 
rack (1.5.2) lib/rack/etag.rb:23:in `call' 
rack (1.5.2) lib/rack/conditionalget.rb:25:in `call' 
rack (1.5.2) lib/rack/head.rb:11:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/params_parser.rb:27:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/flash.rb:254:in `call' 
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' 
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/cookies.rb:560:in `call' 
activerecord (4.1.7) lib/active_record/query_cache.rb:36:in `call' 
activerecord (4.1.7) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call' 
activerecord (4.1.7) lib/active_record/migration.rb:380:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (4.1.7) lib/active_support/callbacks.rb:82:in `run_callbacks' 
actionpack (4.1.7) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/reloader.rb:73:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
railties (4.1.7) lib/rails/rack/logger.rb:38:in `call_app' 
railties (4.1.7) lib/rails/rack/logger.rb:20:in `block in call' 
activesupport (4.1.7) lib/active_support/tagged_logging.rb:68:in `block in tagged' 
activesupport (4.1.7) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (4.1.7) lib/active_support/tagged_logging.rb:68:in `tagged' 
railties (4.1.7) lib/rails/rack/logger.rb:20:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
activesupport (4.1.7) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
actionpack (4.1.7) lib/action_dispatch/middleware/static.rb:84:in `call' 
rack (1.5.2) lib/rack/sendfile.rb:112:in `call' 
railties (4.1.7) lib/rails/engine.rb:514:in `call' 
railties (4.1.7) lib/rails/application.rb:144:in `call' 
rack (1.5.2) lib/rack/lock.rb:17:in `call' 
rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' 
/Users/lasernite/.rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service' 
/Users/lasernite/.rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run' 
/Users/lasernite/.rvm/rubies/ruby-2.1.4/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread' 

Answer 1

Проблема здесь вы пытаетесь напечатать текст всех сообщений, текст атрибутом одного поста .. Вот почему она не может найти "текст 'атрибут результата объединения (Post.all).

def index 
    @posts = Post.all 
end 


#index.html.erb 
<% @posts.each do |post| %> 
    <%= post.text %> 
<% end %> 

Предполагая, что вы пытаетесь перечислить все сообщения & создать новый пост, находясь в приветственном/индекса, вам необходимо изменить свой указательный действие, как это:

def index 
    @posts = Post.all #this one to list posts 
    @post = Post.new #this initializer will be used in your _new partial. 
    end