从另一个控制器渲染部分中断应用程序 - #<Post::ActiveRecord_Relation:0x007fe74893b390> 的未定义方法“文本”
Rendering partial from another controller breaks app - undefined method `text' for #<Post::ActiveRecord_Relation:0x007fe74893b390>
我正在尝试从另一个视图 posts/_index 和 posts/_new 以及控制器 Posts 将局部渲染到另一个视图 welcome/index。 posts/_index 加载正常，但我无法理解 out/understand 为什么 posts/_new 会为仅在数据库迁移中定义的 :text 方法抛出错误，我认为这将是普遍的无障碍。
这是它引用 welcome/_new 部分错误的地方：
<%= form_for :post, url: posts_path do |f| %>
<p id="post_box">
<%= f.text_area :text %>
</p>
<p>
<%= f.submit %>
</p>
<% end %>
这是有效的 posts/_index 部分：
<% post.reverse.each do |post| %>
<div class="panel panel-default">
<div class="panel-body">
<%= post.text %>
</div>
</div>
<% end %>
供参考，代码与以下代码相同：
除了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
完整跟踪：
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'
这里的问题是您正在尝试打印所有 post 的文本，文本是单个 post 的属性。这就是它无法打印的原因找到关联结果的'text'属性(Post.all).
def index
@posts = Post.all
end
#index.html.erb
<% @posts.each do |post| %>
<%= post.text %>
<% end %>
假设您正在尝试列出所有 post 并在 welcome/index 中创建一个新的 post，您需要像这样修改索引操作：
def index
@posts = Post.all #this one to list posts
@post = Post.new #this initializer will be used in your _new partial.
end
我正在尝试从另一个视图 posts/_index 和 posts/_new 以及控制器 Posts 将局部渲染到另一个视图 welcome/index。 posts/_index 加载正常，但我无法理解 out/understand 为什么 posts/_new 会为仅在数据库迁移中定义的 :text 方法抛出错误，我认为这将是普遍的无障碍。
这是它引用 welcome/_new 部分错误的地方：
<%= form_for :post, url: posts_path do |f| %>
<p id="post_box">
<%= f.text_area :text %>
</p>
<p>
<%= f.submit %>
</p>
<% end %>
这是有效的 posts/_index 部分：
<% post.reverse.each do |post| %>
<div class="panel panel-default">
<div class="panel-body">
<%= post.text %>
</div>
</div>
<% end %>
供参考，代码与以下代码相同：
除了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
完整跟踪：
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'
这里的问题是您正在尝试打印所有 post 的文本，文本是单个 post 的属性。这就是它无法打印的原因找到关联结果的'text'属性(Post.all).
def index
@posts = Post.all
end
#index.html.erb
<% @posts.each do |post| %>
<%= post.text %>
<% end %>
假设您正在尝试列出所有 post 并在 welcome/index 中创建一个新的 post，您需要像这样修改索引操作：
def index
@posts = Post.all #this one to list posts
@post = Post.new #this initializer will be used in your _new partial.
end