Question

我目前正在尝试向我的员工添加一系列牧场我发现创建一个额外的表来建立这种关联会更好。我遵循一些教程，但不在我身边

这是我的代码：

员工/ _form：

<%= form_for(@staff) do |f| %>


  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>

    <%= fields_for(@staff_ranch) do |x| %>
    <div class="field">

      <%= x.collection_select(:ranch_id, @all_ranch, :id, :name, { }, {:multiple => true}) %>
    </div>
  <%end%>


  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

我的模特： - 牧场：

has_many :ranchstaffs
has_many :staffs, :through => :ranchstaffs

- 工作人员：

has_many :ranchstaffs
has_many :ranches, :through => :ranchstaffs

-Ranchstaff：

belongs_to :ranch
belongs_to :staff

员工控制员：

   class StaffsController < ApplicationController
  before_action :set_staff, only: [:show, :edit, :update, :destroy]

  # GET /ranches
  # GET /ranches.json
  def index
    @staffs = current_user.staffs
  end

  # GET /ranches/1
  # GET /ranches/1.json
  def show

  end

  # GET /ranches/new
  def new
    @staff = Staff.new
    @all_ranch = current_user.ranches
    @staff_ranch = @staff.ranchstaffs.build
  end

  # GET /ranches/1/edit
  def edit
  end

  # POST /ranches
  # POST /ranches.json
  def create
    @staff = Staff.new(staff_params)

    @staff.update(user_id: current_user.id)
    respond_to do |format|
      if @staff.save
        format.html { redirect_to @staff, notice: 'Staff was successfully created.' }
        format.json { render :show, status: :created, location: @staff }
      else
        format.html { render :new }
        format.json { render json: @staff.errors, status: :unprocessable_entity }
      end
    end
  end

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

  # DELETE /ranches/1
  # DELETE /ranches/1.json
  def destroy
    @staff.destroy
    respond_to do |format|
      format.html { redirect_to staffs_url, notice: 'Ranch was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_staff
      @staff = Staff.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def staff_params
      params.require(:staff).permit(:name, :user_id, :cat, :ranch_id)
    end
end

你能解释一下为什么在新员工创建后没有创建模型ranchstaff吗？

Answer 1

当您使用fields_for时，您使用的是嵌套表单，但您不允许正确使用这些参数。首先在表单中进行更改：

<%= f.fields_for(@staff_ranch) do |x| %>
  <div class="field">
    <%= x.collection_select(:ranch_id, @all_ranch, :id, :name, { }, {:multiple => true}) %>
  </div>
<% end %>

然后在你的控制器中：

def staff_params
  params.require(:staff).permit(:name, :user_id, :cat, ranchstaff_attributes: [ranch_id: []])
end

在您的Staff模型中写道：

accepts_nested_attributes_for :ranchstaffs

然后，在创建ranchstaff时，应创建User。

Answer 2

你的ranch_id正在排成一列。所以你必须指定ranch_id是强参数中的数组。所以你的staff_params方法看起来像这样

def staff_params
  params.require(:staff).permit(:name, :user_id, :cat, :staff_ranch_attributes =>[:ranch_id => []])
end

collection_select没有创建关联表

2 个答案: