控制器可以在本地正常运行，但不能在heroku上运行

Question

我正在将亚马逊S3和heroku与载波结合使用，以上传和存储图像。 它在本地运行良好，但由于某种原因，未在heroku上执行控制器功能“ new”。 我已经将params [：controller]和params [：action]打印到视图中，并且它们都是正确的，所以我不确定问题出在哪里。

的routes.rb

      Rails.application.routes.draw do
  resources :surroundings

  resources :headings

  resources :options

  resources :categories

  resources :mains

  resources :properties do


    resources :images, only: [:index, :new, :create, :destroy] do
    collection do 
    get 'update_main' 
    end

    end


    get 'addoption'
    post 'postoption'

end

root 'search#main'
get 'main' =>'search#main'

images_controller.rb

class ImagesController < ApplicationController




def new
#redirect_to property_images_path #used for trouble shooting - does not redirect
@property=Property.find(params[:property_id])
@image = Image.new

end


 def index
    @images = Property.find(params[:property_id]).images
  end



def update_main
#set the current main image to false
   r=Property.find(params[:property_id]).images.where("main" => true).first
   r.main=false unless r.nil?
   r.save unless r.nil?
   @image=Image.find(params[:main])
   @image.main=true;
   @image.save
 redirect_to property_images_path, notice: "The Image has been uploaded."
end


  def create
    @image = Image.new(image_params)
    @image.property_id=params[:property_id]
    if @image.save
      redirect_to property_images_path, notice: "The Image has been uploaded."
    else
      render "new"
    end
  end

  def destroy
    @image = Image.find(params[:id])
    @image.destroy
    redirect_to property_images_path, notice:  "The Image  has been deleted."
  end

private
  def image_params
   params.require(:image).permit(:attachment,:property_id)
  end
end

new.html.erb

<h1>Add new image</h1>
<%=params[:controller]%>
<%=params[:action]%>


<%= form_for([@property,@image]) do |f| %>
 <%= label_tag("Select image file") %>
   <%= f.file_field :attachment, class:"btn btn-default" %> 

<br>

    <%= f.submit class:"btn btn-primary" %>

<% end %>

heroku错误日志

Processing by ImagesController#new as HTML
2016-02-06T07:43:25.314010+00:00 app[web.1]:   Parameters: {"property_id"=>"1"}
2016-02-06T07:43:25.519196+00:00 heroku[router]: at=info method=GET path="/properties/1/images/new" host=auspropguides.herokuapp.com request_id=ecaefc40-5556-4239-9da6-1a154fa489f3 fwd="14.201.25.50" dyno=web.1 connect=0ms service=391ms status=500 bytes=1754
2016-02-06T07:43:25.509640+00:00 app[web.1]:   Rendered images/new.html.erb within layouts/application (1.9ms)
2016-02-06T07:43:25.512962+00:00 app[web.1]: 
2016-02-06T07:43:25.512964+00:00 app[web.1]: ActionView::Template::Error (First argument in form cannot contain nil or be empty):
2016-02-06T07:43:25.509818+00:00 app[web.1]: Completed 500 Internal Server Error in 196ms
2016-02-06T07:43:25.512968+00:00 app[web.1]:     7:  <%= label_tag("Select image file") %>
2016-02-06T07:43:25.512969+00:00 app[web.1]:     8:    <%= f.file_field :attachment, class:"btn btn-default" %> 
2016-02-06T07:43:25.512965+00:00 app[web.1]:     3: <%=params[:action]%>
2016-02-06T07:43:25.512967+00:00 app[web.1]:     5: 
2016-02-06T07:43:25.512968+00:00 app[web.1]:     6: <%= form_for([@property,@image]) do |f| %>
2016-02-06T07:43:25.512966+00:00 app[web.1]:     4: 
2016-02-06T07:43:25.512971+00:00 app[web.1]:   app/views/images/new.html.erb:6:in `_app_views_images_new_html_erb___892626609660663212_69968138740340'
2016-02-06T07:43:25.512972+00:00 app[web.1]: 
2016-02-06T07:43:25.512970+00:00 app[web.1]:     9: 
2016-02-06T07:43:25.512972+00:00 app[web.1]: 

控制台日志

irb(main):001:0> Property.find(1)
  Property Load (2.2ms)  SELECT  "properties".* FROM "properties" WHERE "properties"."id" = $1 LIMIT 1  [["id", 1]]
  Property Load (2.2ms)  SELECT  "properties".* FROM "properties" WHERE "properties"."id" = $1 LIMIT 1  [["id", 1]]
=> #<Property id: 1, listing_status: "In Draft", my_property_reference: "My reference", floor_area: 350, land_area: 500, state: "New Development", city: "Sydney", area: "CBD", street: "123 fake st", price: 800000, floors: 2, property_type: "Apartment", property_age: nil, completion: 2016, bedrooms: 5, bathrooms: 2, under_cover_car_spaces: 3, car_spaces: nil, car_lock_up_garage: 1, additional_information: "Great location in a great area.", description: "great house great house great house great house gr...", created_at: "2016-02-04 03:44:54", updated_at: "2016-02-04 03:46:55", suburb: nil>
irb(main):002:0> Image.all
  Image Load (1.8ms)  SELECT "images".* FROM "images"
  Image Load (1.8ms)  SELECT "images".* FROM "images"
=> #<ActiveRecord::Relation []>
irb(main):003:0> Image
=> Image(id: integer, main: boolean, attachment: string, created_at: datetime, updated_at: datetime, property_id: integer)
irb(main):004:0> 

Answer 1

问题是，由于您已将images嵌套在properties下，因此，如果要使form_for起作用，则必须声明两个@instance变量：

def new
  @property = Property.find params[:property_id]
  @image    = Image.new
end

当然，您已经这样做了。

这个问题，那么，你的Property有id的1不会对您的生产环境中。 您需要确保以与开发相同的方式来处理数据集（评估相关对象是否不存在）：

def new
   @property = Property.find params[:property_id]
   if @property 
      @image = @property.images.new
   else
     redirect_to root_path, notice: "No Property" 
   end
end

---

您还需要在routes 中一次定义多个resources （以进行清理）：

#config/routes.rb
resources :surroundings, :headings, :options, :categories, :mains
resources :properties do
  resources :images, only: [:index, :new, :create, :destroy] do
    get 'update_main', on: :collection
  end
  get  :addoption
  post :postoption
end

resources :search, path: "", only: [] do
  get :main, on: :collection
end

root 'search#main'

---

更新

解决方案很简单，OP留下了一个class ImagesController < ApplicationController声明的photos_controller.rb文件。 删除此文件可解决此问题。