我想使用户注册等的(每天)使用chartkick,它是一个简单的一行代码的数量的线图,但它是给一个错误未定义的方法`group_by_day” - 轨道3.2
`undefined method `group_by_day' for #<Class:0x00000004b4fbf0>`
在我的意见我有
<%= line_chart User.group_by_day(:created_at).count %>
错误日志:
Rendered admin/dashboards/index.html.erb within layouts/application (145.2ms)
Completed 500 Internal Server Error in 1018ms
NoMethodError - undefined method `group_by_day' for #<Class:0x00000004b4fbf0>:
activerecord (3.2.14) lib/active_record/dynamic_matchers.rb:55:in `method_missing'
app/views/admin/dashboards/index.html.erb:38:in `_app_views_admin_dashboards_index_html_erb___3330517857505238097_39214860'
actionpack (3.2.14) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.14) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.14) lib/action_view/template.rb:143:in `render'
actionpack (3.2.14) lib/action_view/renderer/template_renderer.rb:48:in `block (2 levels) in render_template'
actionpack (3.2.14) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.14) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.14) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.14) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.14) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
非常感谢,我检查了宝石,这是我失踪。 – ben
但有一些我不明白,为什么不能从另一个表访问属性。例如:<%= pie_chart User.city.group(“name”)。count%>,从此我想访问用户的城市名称。不工作,我在这里做错了什么? – ben
@ben我认为你的意思是计算每个城市的用户数量,可能你可以尝试'User.includes(:city).group(“city.name”)。count' – Mifeng