Rails - will_paginate 说 "variable appears to be empty. Did you forget to pass the collection object for will_paginate?"

Question

我有这个查询：

@cars = Car.paginate(page: params[:page], per_page: 5).order(created_at: :desc).group_by { |r| r.created_at.to_date }

并且在视图中：

= will_paginate @cars

但我收到此错误（在 site#index 中呈现）：

The @site variable appears to be empty. Did you forget to pass the collection object for will_paginate?

我也试过用这种方式更新查询：

@cars = Car.order(created_at: :desc).paginate(page: params[:page], per_page: 5).group_by { |r| r.created_at.to_date }

但是错误还是一样

如何解决这个问题？

谢谢

Answer 1

你可以在你的控制器中做这样的事情：

@car_paginator = Car.paginate(page: params[:page], per_page: 5).order(created_at: :desc)
@cars = @car_paginator.group_by { |r| r.created_at.to_date }

然后在您的视图中更改带有分页的行：

= will_paginate @car_paginator

问题是：当您使用 paginate 方法时，结果不是普通的数组或数据库关系，而是具有一些额外信息的对象，例如 @size。如果你运行 group_by 你删除了那个额外的属性和 return 一个普通的散列。

Rails - will_paginate says "variable appears to be empty. Did you forget to pass the collection object for will_paginate?"