Ruby nil:NilClass的未定义方法“plantposts”

这是我在railstutorial.org上完成教程后的第一个应用程序，在此之前一切都很顺利。在我的应用程序中，每个用户都可以创建植物，每个植物都可以有许多植物贴子。我已经在plants/id show页面上放置了一个表格，用于创建我无法工作的新PlantPost。我怀疑这可能与routes文件有关

这是我的控制器：

class PlantpostsController < ApplicationController

before_action :logged_in_user, only: [:create, :destroy]
before_action :correct_user,   only: :destroy

def create
#@plantpost = Plantpost.new(plantpost_params)
#@plant = Plant.find(params[:plant_id])
@plantpost = @plant.plantposts.build(plantpost_params) #this seems to be the main problem line.

if @plantpost.save
  flash[:success] = "Plantpost created!"
  redirect_to    plant_path(@plantpost.plant_id)
else
   flash[:danger] = "No Plantpost created!"
  @plantpost_feed_items = []
  redirect_to plant_path(id: params[:plant_id]  )   
end
end
def destroy
@plantpost.destroy 
flash[:success] = "Plantpost deleted"
redirect_to request.referrer || root_url

我的植物控制员

class PlantsController < ApplicationController

before_action :logged_in_user, only: [:index, :create, :edit, :update,
                                     :destroy, :show]
before_action :correct_user,   only: [:destroy, :update ]

def new
@plant = Plant.new
end

def index
 @plant_feed_items = current_user.plants.paginate(page: params[:page], :per_page => 10)
 @plants = current_user.plants.all
 @plant =  Plant.new
end

def show   
 @plant = Plant.find(params[:id])
 @plantpost_feed_items  = @plant.plantpost_feed.paginate(page: params[:page], :per_page => 10)
 @plantposts = @plant.plantposts.paginate(page: params[:page])
 @plantpost = Plantpost.new
end
private
   def plant_params
      params.require(:plant).permit( :notes, :plantname,:source, :planted, :harvested, :yield, :yieldunits)
   end
   def correct_user
      @plant = current_user.plants.find_by(id: params[:id])
      redirect_to root_url if @plant.nil?
   end
       def plantpost_params
      params.require(:plantpost).permit(:content, :picture, :user_id, :plant_id)
    end

结束

从所有的hashtag中可以看出，我尝试了很多组合，希望能找到正确的组合。 我还编写了一个集成测试，在该测试中，这条生产线将发布到工厂_path@plant.id，plantpost:{content:}获取此响应

错误[test_plantpost_接口，PlantpostInterfaceTest，1.515159549] 测试\u plantpost\u接口PlantPostInterfaceTest 1.52s ActionController:：RoutingError:ActionController:：RoutingError:No route matches[POST]>/plants/980190962 测试/集成/plantposts_接口_测试。rb:16：块中 ' 测试/集成/plantposts_接口_测试。rb:16:inblock in'

---

看起来你想做的就是把资源嵌套起来。 在路由文件中，更改

resources :plantposts,          only: [:create, :destroy]
resources :plants

到

---

这是一个语法问题。工作创建代码为：

def create
 @plant = Plant.find_by(id: params[:plant_id] )

 @plantpost = @plant.plantposts.build({:plant_id => params[:plant_id], :user_id =>   current_user.id, :content => params[:plantpost][:content], :picture => params[:plantpost][:picture]})
 if @plantpost.save
  flash[:success] = "Plantpost created!"
   redirect_to plant_path :id =>  @plant.id 
 else
  @plantpost_feed_items = []
  render  'plants/show', :id =>  @plant.id 
 end
end

---

我相信有一种更干净的方法可以做到这一点，但我会继续前进。

谢谢。我更改了routes文件并重新定义了一些命名路径，虽然我的测试进展得稍微快了一点，但我仍然在plantposts控制器中为nil:NilClass错误获取未定义的方法“plantposts”。当然，当我使用IRB控制台时，一切正常，但是当我运行应用程序时，我得到了异常，尽管所有参数都正常。

 Rails.application.routes.draw do
 get 'password_resets/new'

 get 'password_resets/edit'

root                'static_pages#home'
get    'help'    => 'static_pages#help'
get    'about'   => 'static_pages#about'
get    'contact' => 'static_pages#contact'
get    'signup'  => 'users#new'
get    'login'   => 'sessions#new'
post   'login'   => 'sessions#create'

delete 'logout'  => 'sessions#destroy'


 resources :users do
  member do
   get :following, :followers
  end
end

resources :account_activations, only: [:edit]
resources :password_resets,     only: [:new, :create, :edit, :update]
resources :microposts,          only: [:create, :destroy]
resources :relationships,       only: [:create, :destroy]
resources :plantposts,          only: [:create, :destroy]
resources :plants
 #post    'plants'  => 'plantposts#create'

resources :plantposts,          only: [:create, :destroy]
resources :plants

resources :plants do
  resources :plantposts,          only: [:create, :destroy]
end

def create
 @plant = Plant.find_by(id: params[:plant_id] )

 @plantpost = @plant.plantposts.build({:plant_id => params[:plant_id], :user_id =>   current_user.id, :content => params[:plantpost][:content], :picture => params[:plantpost][:picture]})
 if @plantpost.save
  flash[:success] = "Plantpost created!"
   redirect_to plant_path :id =>  @plant.id 
 else
  @plantpost_feed_items = []
  render  'plants/show', :id =>  @plant.id 
 end
end