Rails的回形針和：編輯頁面上傳新文件

我用回形針和Rails 4上傳圖片。目標是允許用戶在編輯頁面上添加新圖像。目前用戶可以查看與模型相關的當前圖像並將其刪除，但我希望用戶能夠在同一頁面上上傳新圖像。Rails的回形針和：編輯頁面上傳新文件

由於表單提交給controller#update我不知道如何建立相關的模型的實例變量的新形象。

= form_for @car, html: { multipart: true, id: "fileupload", "data-abide" => true } do |f|  
... 
    %h4                                          
    New files                                        
    = f.fields_for :uploads do |upload_fields|                                
     = upload_fields.file_field :upload                                 
    - unless f.object.new_record?                                   
    %h4                                         
     Old Files                                       
    = f.fields_for :uploads do |upload_fields|                                
     .thumb                                        
     = link_to image_tag(upload_fields.object.upload.url(:thumb)), upload_fields.object.upload.url(:original)               
     = upload_fields.check_box :_destroy

Car.rb

class Car < ActiveRecord::Base                                     
    has_many :uploads, dependent: :destroy                                  


    validates :make, :model, :year, :seats, :transmission, :drive, :interior, :exterior, presence: true                   

    accepts_nested_attributes_for :uploads, allow_destroy: true                             

    # http://stackoverflow.com/questions/2672744/rails-activerecord-find-all-users-except-current-user/2674308#2674308               
    scope :without_car, lambda{|car| car ? {conditions: ["id != ?", car.id]} : {} }                        

end

Upload.rb

class Upload < ActiveRecord::Base                                    
    belongs_to :car                                        

    has_attached_file :upload, styles: { medium: '300x300>', thumb: '100x100>' }                         

    validates_attachment_content_type :upload, :content_type => /\Aimage\/.*\Z/                         
    validates_attachment_presence :upload                                  

end

來源

2014-02-06 Patrick

你可以分享你的車，上傳模型關聯。我假定上傳模型具有has_attached_file關聯。 – blotto

問題更新 – Patrick

你可能不得不使用一個連接模型（與關聯像has_many :through此）：

模式

個

#app/models/car.rb 
Class Car < ActiveRecord::Base 
    has_many :car_uploads 
    has_many :uploads, through: :car_uploads 

    accepts_nested_attributes_for :car_uploads 
end 

#app/models/car_upload.rb 
Class CarUpload < ActiveRecord::Base 
    belongs_to :car 
    belongs_to :upload 

    accepts_nested_attributes_for :upload 
end 

#app/models/upload.rb 
Class Upload < ActiveRecord::Base 
    has_many :car_uploads 
    has_many :uploads, through: :car_uploads 
end

控制器

#app/controllers/cars_controller.rb 
def update 
    @car = Car.find(params[:id]) 
    @car.update(car_params) #-> not sure if that will work 
end 

private 

def car_params 
    params.require(:car).permit(car_uploads_attributes: [upload_attributes:[:upload]]) 
end

查看

= form_for @car, html: { multipart: true, id: "fileupload", "data-abide" => true } do |f|  
... 
    %h4                                          
    New files                                        
    = f.fields_for :car_uploads do |car_upload_fields| 
     = car_upload_fields.fields_for :uploads do |u|                                
      = upload_fields.file_field :upload                                 
    - unless f.object.new_record?                                   
    %h4                                         
     Old Files                                       
    = f.fields_for :car_uploads do |car_upload_fields| 
     = car_upload_fields.fields_for :uploads do |u|                               
      .thumb                                        
      = link_to image_tag(u.object.upload.url(:thumb)), u.object.upload.url(:original)               
      = u.check_box :_destroy

來源

2014-02-07 11:05:15

這是我從哪裏開始的，但它需要調整 –

Rails的回形針和：編輯頁面上傳新文件

回答

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