Rails ActiveRecord以diff值作为参数进行排序？

Question

我想根据rails中的特定key = value参数触发不同的排序查询。我的语法需要帮助。我希望你能看到我想要实现的目标吗？

控制器中的

：

def index
   if params[:sort = originality?].present?
    #perform your logic with sort
   end
   #Other logic
 end

def index
   if params[:sort = dynamics?].present?
    #perform your logic with sort
   end
   #Other logic
end

在视图中：

   <li class="dropdown">
    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Rankingz <b class="caret"></b></a>
  <ul class="dropdown-menu">
    <!-- We are passing the sort parameter here -->
    <li><a href="?sort=originality">Originality</a></li>
    <li><a href="?sort=dynamics">Dynamics</a></li>
    <li><a href="?sort=Execution">Execution</a></li>
    <li><a href="?sort=Battle">Battle</a></li>
    <li><a href="?sort=Votes">Votes</a></li>
  </ul>
</li>

Answer 1

您不应再次定义索引操作，将索引操作更改为：

def index
  if params[:sort].present?
    sort_fields = ['originality', 'dynamics', 'execution', 'battle', 'votes']
    @instance_var = ModelName.order(params[:sort]) if sort_field.include?(params[:sort])
  end

    @instance_var ||= ModelName.all #ensure if the instace variable is not nil.
end