Question

这是我在railstutorial.org上完成教程后的第一个应用程序，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，每个植物可以有许多植物。我已经在植物/ id（显示）页面上放置了一个表单来创建新的植物插页，这是我无法工作的。我怀疑它可能与路径文件有关。

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

端

私有

 def plantpost_params
  params.require(:plantpost).permit(:content, :picture, :user_id, :plant_id)
end

def correct_user
  @plantpost = current_user.plantposts.find_by(id: params[:id])
  redirect_to root_url if @plantpost.nil?
 end
 end

我的植物控制器

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

模型关系的相关部分

class User < ActiveRecord::Base
has_many :plants, dependent: :destroy
has_many :plantposts, through: :plants,  dependent: :destroy

class Plant < ActiveRecord::Base
has_many :plantposts, dependent: :destroy
belongs_to :user

class Plantpost < ActiveRecord::Base
belongs_to :plant
belongs_to :user

路线档案

 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'

端

正如你从所有标签中看到的那样，我一直在尝试很多希望偶然发现正确标签的组合。我还编写了一个集成测试，其中“post plant_path（@ plant.id），plantpost：{content：”“}”获得此回复

ERROR [“test_plantpost_interface”，PlantpostInterfaceTest，1.515159549] test_plantpost_interface #PlantpostInterfaceTest（1.52s） ActionController :: RoutingError：ActionController :: RoutingError：没有路由匹配[POST]＆gt;“/ plants / 980190962” test / integration / plantposts_interface_test.rb:16:in block in <class:PlantpostInterfaceTest>' test/integration/plantposts_interface_test.rb:16:in块中的'

Answer 1

看起来你想要做的就是嵌套资源。在路线文件中，更改

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

到

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

Answer 2

这结果是一个语法问题。工作创建代码是：

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

我确信有一种更清洁的方法可以做到，但我还在继续。

未定义的方法`plantposts＆＃39;为零：NilClass

2 个答案: