Question

我正在创建一个带有托盘和植物的花园应用程序。托盘has_many植物，植物属于托盘等。

我收到上述错误，我不知道如何将tray_id分配给正在创建的新工厂。

以下是托盘展示视图中的添加工厂按钮

<%= link_to 'ADD PLANT', new_plant_path(@tray.id), class: "btn btn-raised btn-success hoverable" %>

这是我的plants_controller：

class PlantsController < ApplicationController
before_action :set_plant, only: [:show, :edit, :update, :destroy]


# GET /plants
# GET /plants.json
def index
  @plants = Plant.all
end


def show
end

def new
  @plant = Plant.new
end

def edit
end

def create
  tray = Tray.find(params[:tray_id])
  @plant = tray.plants.create(plant_params)


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


def update
  respond_to do |format|
    if @plant.update(plant_params)
      format.html { redirect_to @plant, notice: 'Plant was successfully updated.' }
      format.json { render :show, status: :ok, location: @plant }
    else
      format.html { render :edit }
      format.json { render json: @plant.errors, status: :unprocessable_entity }
    end
  end
end
def destroy
  @plant.destroy
  respond_to do |format|
    format.html { redirect_to plants_url, notice: 'Plant was successfully destroyed.' }
    format.json { head :no_content }
  end
end

private
# Use callbacks to share common setup or constraints between actions.


def set_plant
  @plant = Plant.find(params[:id])
end

def plant_params
  params.require(:plant).permit(:title, :notes, :category_id, :tray_id, images_files: [])
  end
end

这是我的托盘控制器

class PlantsController < ApplicationController
before_action :set_plant, only: [:show, :edit, :update, :destroy]


def index
  @plants = Plant.all
end

def show
end

def new
  @plant = Plant.new
end

def edit
end

def create
  tray = Tray.find(params[:tray_id])
  @plant = tray.plants.create(plant_params)

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

def update
  respond_to do |format|
    if @plant.update(plant_params)
      format.html { redirect_to @plant, notice: 'Plant was successfully updated.' }
      format.json { render :show, status: :ok, location: @plant }
    else
      format.html { render :edit }
      format.json { render json: @plant.errors, status: :unprocessable_entity }
    end
  end
end

def destroy
  @plant.destroy
  respond_to do |format|
    format.html { redirect_to plants_url, notice: 'Plant was successfully destroyed.' }
    format.json { head :no_content }
  end
end

private
# Use callbacks to share common setup or constraints between actions.


  def set_plant
    @plant = Plant.find(params[:id])
  end


  def plant_params
    params.require(:plant).permit(:title, :notes, :category_id, :tray_id, images_files: [])
  end
end

这是我创建新植物的表格

<%= form_for(@plant) do |f| %>
  <%= f.label 'NAME' %>
      <%= f.text_field :title, class: 'form-control', id: 'focusedInput1', placeholder: 'ENTER NAME' %>
 etc, etc
<% end %>

我做错了什么？谢谢你的帮助：）

Answer 1

帖子控制器中此行params[:tray_id]上的nil为tray = Tray.find(params[:tray_id])。

你也没有将tray_id传递给你的参数。您需要将其作为参数正确传递给您的新操作：

<%= link_to 'ADD PLANT', new_plant_path(tray_id: @tray.id), class: "btn btn-raised btn-success hoverable" %>

然后添加隐藏字段以在表单中传递:tray_id：

<%= f.hidden_field :tray_id, value: params[:tray_id] %>

现在，您可以使用tray = Tray.find(params[:plant][:tray_id])在创建操作中找到托盘。

无法找到带有＆＃39; =＆＃39; =的托盘

1 个答案: