它刚刚奏效，但当我从一堆文件中退出时它停止工作，所以我需要一些新鲜的眼睛才能看到我需要放回或取出的东西。
app/views/goals/_upcoming.html.erb:2:in `_app_views_goals__upcoming_html_erb__311311984007827814_70285435296160'
app/views/sidebar/_sidebar.html.erb:8:in `_app_views_sidebar__sidebar_html_erb__935147241238506257_70285436475880'
app/views/layouts/application.html.erb:21:in `_app_views_layouts_application_html_erb__784590708649109669_70285432904920'
undefined method `each' for nil:NilClass
Line #2 <% @top_3_goals.each do |goal| %>
布局/ application.html.erb
<!DOCTYPE html>
<html>
<head>
<title>Personal Control Center</title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
<meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Tells app to be mobile responsive -->
</head>
<body>
<%= render 'layouts/header' %>
<% flash.each do |name, msg| %>
<%= content_tag(:div, msg, class: "alert alert-info") %>
<% end %>
<div class="container-fluid">
<div class="container">
<div class="col-md-8">
<%= yield %>
</div>
<div class="col-md-4">
<%= render 'sidebar/sidebar' %>
</div>
</div>
</div>
</body>
</html>
边栏/ _sidebar.html.erb
<div class="sidebar">
<div id="sidebarsectiontop" class="panel panel-default">
<div id="sidebarheadingtop" class="panel-heading"><h5><b>Today</b></h5></div>
<%= render 'habits/today' %>
</div>
<div id="sidebarsection" class="panel panel-default">
<div id="sidebarheading" class="panel-heading"><h5><b>Upcoming</b></h5></div>
<%= render 'goals/upcoming' %>
</div>
<div id="sidebarsection" class="panel panel-default">
<div id="sidebarheading" class="panel-heading"><h5><b>Count</b></h5></div>
<%= render 'sidebar/count' %>
</div>
<div id="sidebarsection" class="panel panel-default">
<div id="sidebarheading" class="panel-heading"><h5><b>Tags</b></h5></div>
<div id="tag_cloud">
<%= render 'sidebar/tags' %>
</div>
</div>
<div id="sidebarsection" class="panel panel-default">
<div id="sidebarheading" class="panel-heading"><h5><b>Recommendations</b></h5></div>
<%= render 'sidebar/recommendations' %>
</div>
<div id="sidebarsectionbottom" class="panel panel-default">
<div id="sidebarheading" class="panel-heading"><h5><b>Memorize</b></h5></div>
<%= render 'sidebar/memorize' %>
</div>
</div>
目标/ upcoming.html.erb
<table>
<% @top_3_goals.each do |goal| %>
<tr>
<td>
<strong>
<%= link_to top_3_goal.name, edit_goal_path(top_3_goal) %>
</strong>
</td>
<td>
<%= top_3_goals.deadline.strftime("%m-%d-%Y") %>
</td>
</tr>
<% end %>
</table>
目标控制器
def index
if params[:tag]
@goals = Goal.tagged_with(params[:tag])
else
@goals = Goal.all.order("deadline")
@accomplished_goals = current_user.goals.accomplished
@unaccomplished_goals = current_user.goals.unaccomplished
@top_3_goals = @unaccomplished_goals.top_3
end
end
目标模型
class Goal < ActiveRecord::Base
belongs_to :user
acts_as_taggable
scope :accomplished, -> { where(accomplished: true) }
scope :unaccomplished, -> { where(accomplished: false) }
validates :name, presence: true
# class for sidebar
scope :top_3, -> do
order("deadline DESC").
limit(3)
end
end
侧边栏控制器
class SidebarController < ApplicationController
def sidebar
@unaccomplished_goals = current_user.goals.unaccomplished
@top_3_goals = @unaccomplished_goals.top_3
end
end
谢谢我重置数据库，看看它是否有用，但它没有：/
我试图在侧边栏中加入一些不同的控制器，所以我还在学习。这是fulltrace：
app/views/goals/_upcoming.html.erb:2:in `_app_views_goals__upcoming_html_erb__311311984007827814_70285435296160'
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/sidebar/_sidebar.html.erb:8:in `_app_views_sidebar__sidebar_html_erb__935147241238506257_70285436475880'
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/layouts/application.html.erb:21:in `_app_views_layouts_application_html_erb__784590708649109669_70285432904920'
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:66: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: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'
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)
@top_3_goals是零。仔细检查这个分配链是否根据数据库中的内容返回您认为应该的内容：
@accomplished_goals = current_user.goals.accomplished
@unaccomplished_goals = current_user.goals.unaccomplished
@top_3_goals = @unaccomplished_goals.top_3
答案 1 :(得分：0)
我需要添加它来修复nill问题：
class ApplicationController < ActionController::Base
before_action :set_top_3_goals
def set_top_3_goals
@top_3_goals = current_user.goals.unaccomplished.top_3
end
end
我从这里得到的：How to stop NoMethodError when clicking #new & #edit?