Question

请帮忙表单不保存collection_select，也不会编辑 _form.html.erb

<div class="field">
  <%= f.label :company_id %><br />
  <%= collection_select(:learner, :learner_id, @clients, :id, :name,    prompt: >true) %> 
</div>

learners_controller.rb

def new
    @learner = Learner.new
    @clients = Client.all
    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @learner }
    end
  end
  # GET /learners/1/edit
  def edit
  @learner = Learner.find(params[:learner][:learner_id])
  end

  # POST /learners
  # POST /learners.json
  def create
    @learner = Learner.new(learner_params)

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

  # PATCH/PUT /learners/1
  # PATCH/PUT /learners/1.json
  def update
    respond_to do |format|
      if @learner.update(learner_params)
        format.html { redirect_to @learner, notice: 'Learner was successfully updated.' }
        format.json { render :show, status: :ok, location: @learner }
      else
        format.html { render :edit }
        format.json { render json: @learner.errors, status: :unprocessable_entity }
      end
    end
  end

Answer 1

我认为你应该这样做：

def edit
  @learner = Learner.find(params[:learner][:learner_id])
end

找到学习者的记录。

Answer 2

根据您在评论中发布的参数，编辑路线只会将ID传递为:id，因此编辑操作应为：

def edit
  @learner = Learner.find(params[:id])
end

对于不保存collection_select输入的表单，看起来您正在使用Rails 4的默认strong parameters gem。这意味着learner_id必须在列表中可用learner_params列入白名单的参数。在控制器的底部应该是def learner_params params.require(:learner).permit(...other parameters..., :learner_id) end方法。

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Ruby不能从collection_select编辑或保存

2 个答案: