使用JSON数据错误更新Rails模型

时间:2013-01-01 14:31:51

标签: ruby-on-rails ruby-on-rails-3 json jquery ruby-on-rails-3.2

我正在尝试更新rails模型,但即使ajax请求确实存在,我也面临着数据处理方面的一些错误。

发送的参数如下所示:

Parameters: {"{\"slot_allocation\":{\"timeslot_id\":\"3\",\"subject_id\":\"3\",\"slot_allocation_id\":\"1\",\"group_index\
":\"Group 2\",\"lesson_type\":\"Tutorial\"}}"=>nil, "id"=>"1"}
  SlotAllocation Load (0.2ms)  SELECT "slot_allocations".* FROM "slot_allocations" WHERE "slot_allocations"."id" = ? LIMIT 1
  [["id", "1"]]

正常更新确实如此:

  Parameters: {"utf8"=>"✓", "authenticity_token"=>"yBib4ftNdB/r25uZuGnqEZI+r9dulVhyoce8nWBfcBQ=", "slot_allocation"=>{"slot_
allocation_id"=>"1", "lesson_type"=>"Lecture", "group_index"=>"Group 1", "timeslot_id"=>"1", "subject_id"=>"1"}, "commit"=>"
Update Slot allocation", "id"=>"1"}
  SlotAllocation Load (0.3ms)  SELECT "slot_allocations".* FROM "slot_allocations" WHERE "slot_allocations"."id" = ? LIMIT 1
  [["id", "1"]]

我不确定我在Rails和JSON上遇到什么问题。

我已尝试过How do I parse JSON with Ruby on Rails?发布的解决方案。但在更改我的代码后,请求不会被发送出去。我也尝试通过以下某些示例来更改正在发送的数据,但它也没有用完。

我很感激我可以采取哪些措施来解决这个错误。

以下是相关代码:

我的Ajax请求:

var url = 'slot_allocations/'+alloc_id;

var dataToServer = {"slot_allocation":{"timeslot_id":timeslot, "subject_id":subject,"slot_allocation_id":alloc_id, "group_index":"Group 2", "lesson_type":"Tutorial"}}

  $.ajax({
    type: "PUT",
    url: url, 
    dataType: "json",
    data: JSON.stringify(dataToServer) 
    });

我的控制器更新操作:

  def update
    @slot_allocation = SlotAllocation.find(params[:id])

    respond_to do |format|
     if @slot_allocation.update_attributes(params[:slot_allocation])
        format.html { redirect_to @slot_allocation, notice: 'Slot allocation was successfully updated.' }
        format.json { head :ok}
      else
        format.html { render action: "edit" }
        format.json { render json: @slot_allocation.errors, status: :unprocessable_entity }
        format.js  { render :js => @slot_allocation.errors, :status => :unprocessable_entity }
      end
    end
  end

我很感激有关我可能出错的地方的任何建议。谢谢!

1 个答案:

答案 0 :(得分:1)

update_attributes期待哈希。通过将发送到服务器的数据转换为JSON,params包含一个JSON字符串。您应该使用标准POST数据调用控制器:

$.ajax({
  type: "PUT",
  url: url, 
  dataType: "json",
  data: dataToServer
});