我按照Railscast的#228集在我的应用中创建了一个可排序的表格列。
我的问题:当我第一次按下列名时 - 它会按升序显示订单。下次我点击 - 它不会按降序自动显示记录;但是,如果我手动编写desc:" http://localhost:3000/admin/users/2/records?direction=desc&sort=created_at" - 它完美地运作;什么是问题?
我的控制器:
def records
@records = @user.records.paginate(page: params[:page], per_page: 20).order(sort_column + " " + sort_direction)
end
private
def sort_column
Record.column_names.include?(params[:sort]) ? params[:sort] : "created_at"
end
def sort_direction
%w[asc desc].include?(params[:direction]) ? params[:direction] : "asc"
end
我的application_helper:
def sortable(column, title = nil)
title ||= column.titleize
css_class = column == sort_column ? "current #{sort_direction}" : nil
direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"
link_to title, {:sort => column, :direction => direction}, {:class => css_class}
end
我的观点:
<tr>
<th><%= sortable "created_at" %></th>
</tr>
答案 0 :(得分:1)
我不得不写:
direction = sort_column && sort_direction == "asc" ? "desc" : "asc"
而不是:
direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc"