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我的活动有很多事件 - 事件是活动发生的日期和时间。

在我的活动索引中，我想列出未来至少有一个事件的所有活动。

我正在使用 ransack 进行其他过滤，作为类别等。

我如何过滤关系中的大于条件？

我以为我能做到：

obj = search
        .joins(:event)
        .where(:events => ['end_at > ?', Date.today ])

但我得到一个错误：

undefined method `join' for #<Ransack::Search:0x007f8aa8eff918>

更新 以便提供更多上下文，我的控制器看起来像这样

def index            
    if (params[:oldestchild].present? && params[:oldestchild].to_i > 0) ||   
      (params[:youngestchild].present? && params[:youngestchild].to_i > 0)
      @search = Activity
       .where(' (oldest > ?z and youngest < ?) or (oldest > ? and youngest < ?) ', 
         params[:oldestchild], params[:oldestchild],
         params[:youngestchild], params[:youngestchild], 
         )
       .search(params[:q])
    else
       @search = Activity
         .search(params[:q])
    end  

    @activities = Activity.filter(params, @search, request).includes(:provider).includes(:location)

    if current_parent and current_parent.children.first
      @min_child_age = current_parent.min_child_age 
      @max_child_age = current_parent.max_child_age
    end
end

我的模型有这个过滤方法：

  def self.filter(params, search, request)          
        obj = search.result(:distinct => true)      
#       obj = search
#               .joins(:event)
#               .where(:events => ['end_at > ?', Date.today ])      

    if params[:within].present? && (params[:within].to_i > 0)
          obj = obj.where(:location_id => self.build_locations_array(request))
        end                         
        if  params[:q].present? and params[:q][:category_ids].present? 
            obj = obj
            .joins(:categories)
            .where('categories.id' => params[:q][:category_ids])                                                                        
        end
        if params[:date_range] == "This month"              
            obj = obj.where(:start => (Date.today)..(Date.today.at_end_of_month))   
        end

        if params[:date_range] == "Next month"  
            date = Date.today + 1.month             
            obj = obj.where(:start => (date.at_beginning_of_month)..(date.at_end_of_month))                                                                     
        end
        if params[:date_range] == "Next 3 Months"               
            date = Date.today + 3.month             
            obj = obj.where(:start => (Date.today)..(date.at_end_of_month))                                                                     
        end
        if params[:date_range] == "Whenever"             
            obj = obj.where("start > ?",  Date.today)                                                                       
        end 

        obj.paginate(:page => params[:page],  :per_page => 5)               
  end

更新

一种可行但相当难看的选项是使用 sql。 

obj = search.result(:distinct => true)
 .where("exists (select events.id from events 
          where events.activity_id = activities.id 
          and end_at > ?)", Date.today)
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1 回答 1

0

解决方案似乎很简单：从 if else 语句中删除 search(params[:q]) 并在 Activity.filter 调用之后使用它（或者如果它们也抛出相同的错误，则在 include 之后使用它）。

或者，也许更好：

obj = search.result(:distinct => true).joins(:event).where(:events => ['end_at > ?', Date.today ])
于 2013-08-11T09:20:07.657 回答