ruby-on-rails - rails `button_to` 嵌套参数格式不正确

Question

我有一个控制器动作

  def create
    @subject_decision = SubjectDecision.new(subject_decision_params)

    respond_to do |format|
      if @subject_decision.save
        format.html { redirect_to @subject_decision, notice: 'Subject decision was successfully created.' }
        format.json { render :show, status: :created, location: @subject_decision }
      else
        format.html { render :new }
        format.json { render json: @subject_decision.errors, status: :unprocessable_entity }
      end
    end
  end

使用私有方法：

def subject_decision_params
  params.require(:subject_decision).permit(:decision_block_id, :choice_value, :timeline_id, :practice)
end

和一个button_to像这样的观点：

<%= button_to "Choice A", timeline_subject_decisions_path(timeline_id: @timeline.id), method: :post, params:
    { subject_decision:
        {
            decision_block_id: @db.id,
            choice_value: 'a',
            timeline_id: @timeline.id,
            practice: true,
        }
    } 
%>

但是当我单击按钮时，出现以下 rails 错误：

undefined method `permit' for "choice_value=a&decision_block_id=&practice=true&timeline_id=1":String

关于为什么我不能button_to像这样提交表单（）的任何线索？

Answer 1

您可以将您的格式设置button_to为

<%= button_to "Choice A", timeline_subject_decisions_path(timeline_id: @timeline.id), method: :post, params:
    {   
        'subject_decision[decision_block_id]' => @db.id,
        'subject_decision[choice_value]' => 'a',
        'subject_decision[timeline_id]' => @timeline.id,
        'subject_decision[practice]' => true,
    }
%>