I want to make a line-chart of the number of User signups (per day) using chartkick, it is a simple one line code but it is giving an error
`undefined method `group_by_day' for #<Class:0x00000004b4fbf0>`
in my views I have
<%= line_chart User.group_by_day(:created_at).count %>
error logs:
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'
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