导轨`button_to`嵌套PARAMS不正确格式化

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 

带私人方法：

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

和在像视图button_to：

<%= 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，当我点击按钮，我得到以下轨错误：

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

为什么我不能提交表格（button_to）这样的任何线索？

Answer 1

您可以格式化你的button_to作为

<%= 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, 
    } 
%>