app/models/user.rb:51:in `cart_count'
app/views/layouts/_header.html.erb:24:in `block in _app_views_layouts__header_html_erb__3312865121531214569_70179387150260'
app/views/layouts/_header.html.erb:23:in `_app_views_layouts__header_html_erb__3312865121531214569_70179387150260'
app/views/users/show.html.erb:40:in `_app_views_users_show_html_erb___592785710009336321_70179415740600'
app/models/user.rb:51:in `cart_count'
app/views
阅读背景：
未定义方法' scard'为nil:NilClass。
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