我有一个系统设置，用户可以在其中发布微博（基本上是状态更新）并上传照片以使用微博。
我有：
Micropost模型（has_one photo） Photo_album模型（has_many照片） 照片模型（belongs_to micropost，belongs_to photo_album）
用户填写文本区域中的文本并选择照片。提交后，微博表格会更新微博相关数据，例如content，created_at等。
与此同时，我希望我的照片表（照片模型）更新了用户制作的照片选择，但正确的相册。如果你看下面你可以在我的users_controller中看到实例变量@photo的值。这可确保上传的照片链接到名为“microposts album”的正确相册。它的目的是链接所有与微博相关的照片。
我有一个Users_controller：
def new
@user = User.new
@micropost = Micropost.new(:user_id => users_id)
@photo = Photo.new(:photo_album_id => PhotoAlbum.where(:user_id => current_user.id, :album_title => "microposts album").first.id)
end
从上一个问题开始，我问它已经建立，我需要使用accepts_nested_attributes_for，fields_for，以便能够使用一个表单更新多个模型。这就是我设置的方式。
Micropost模型：
class Micropost < ActiveRecord::Base
belongs_to :user
has_one :photo
accepts_nested_attributes_for :photo
attr_accessible :content, :user_id, :poster_id, :username, :image, :remote_image_url
end
照片模型：
class Photo < ActiveRecord::Base
belongs_to :photo_album
attr_accessible :photo_album_id, :photo_title, :image, :remote_image_url
mount_uploader :image, ImageUploader
end
最后这是微博形式：
= form_for @micropost, :remote => true do |f|
= f.fields_for @photo do |p|
= p.file_field :image
= f.hidden_field :user_id
= f.text_area :content
= f.submit "Post"
起初我收到错误：
ActiveModel::MassAssignmentSecurity::Error (Can't mass-assign protected attributes: photo):
我有点困惑，因为我认为属性是自动分配的。无论如何，这就是我在文档中读到的内容。无论如何，我继续添加：照片到微博模型attr_accessible白名单。
第一次出现错误然后我得到了这个错误：
ActiveRecord::AssociationTypeMismatch (Photo(#2169424320) expected, got ActiveSupport::HashWithIndifferentAccess(#2157396720)):
也许我误解了这个功能是如何运作的，但我已经阅读了this并且还查看了3.2.3 api doc但不是我出错的地方。
我真的很感激能帮助你实现这一目标。
提前致谢，我希望这篇长篇文章能够推出。只是想提供所有这些信息会让人们明白我想要做的更好。
亲切的问候
更新 使用：photo_attributes而不是照片给我以下错误：
Started POST "/microposts" for 127.0.0.1 at 2012-05-10 21:01:11 +0100
[02b23327ad83000f75c418d8739e7f49] [127.0.0.1] Processing by MicropostsController#create as JS
[02b23327ad83000f75c418d8739e7f49] [127.0.0.1] Parameters: {"micropost"=>{"photo"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x00000102c293d8 @original_filename="7seriesbmw.jpeg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"micropost[photo][image]\"; filename=\"7seriesbmw.jpeg\"\r\nContent-Type: image/jpeg\r\n", @tempfile=#<File:/var/folders/fh/fhADKPjGG8qSuCeoHCTNYE+++TI/-Tmp-/RackMultipart20120510-14787-1e1mrhh>>}, "user_id"=>"2", "content"=>"ioo"}, "commit"=>"Post", "utf8"=>"✓", "authenticity_token"=>"/y8Lr+e7xgabt60GWxnMGvCtIi7IjqrYDoA84vAqYcE=", "remotipart_submitted"=>"true", "X-Requested-With"=>"IFrame", "X-Http-Accept"=>"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01"}
[02b23327ad83000f75c418d8739e7f49] [127.0.0.1] User Load (0.3ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1
[02b23327ad83000f75c418d8739e7f49] [127.0.0.1] Completed 500 Internal Server Error in 649ms
[02b23327ad83000f75c418d8739e7f49] [127.0.0.1]
ActiveModel::MassAssignmentSecurity::Error (Can't mass-assign protected attributes: photo):
app/controllers/microposts_controller.rb:9:in `create'
将attr_accessor更改为：photo而不是：photo_attributes：
Started POST "/microposts" for 127.0.0.1 at 2012-05-10 21:20:07 +0100
[985e0f204bf7ffac1f7c02fbec35ad9b] [127.0.0.1] Processing by MicropostsController#create as JS
[985e0f204bf7ffac1f7c02fbec35ad9b] [127.0.0.1] Parameters: {"micropost"=>{"photo"=>{"image"=>#<ActionDispatch::Http::UploadedFile:0x00000102f8a3b0 @original_filename="7seriesbmw.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"micropost[photo][image]\"; filename=\"7seriesbmw.png\"\r\nContent-Type: image/png\r\n", @tempfile=#<File:/var/folders/fh/fhADKPjGG8qSuCeoHCTNYE+++TI/-Tmp-/RackMultipart20120510-15197-9rt2xn>>}, "user_id"=>"2", "content"=>"pp"}, "commit"=>"Post", "utf8"=>"✓", "authenticity_token"=>"/y8Lr+e7xgabt60GWxnMGvCtIi7IjqrYDoA84vAqYcE=", "remotipart_submitted"=>"true", "X-Requested-With"=>"IFrame", "X-Http-Accept"=>"text/javascript, application/javascript, application/ecmascript, application/x-ecmascript, */*; q=0.01"}
[985e0f204bf7ffac1f7c02fbec35ad9b] [127.0.0.1] User Load (0.4ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1
[985e0f204bf7ffac1f7c02fbec35ad9b] [127.0.0.1] Completed 500 Internal Server Error in 452ms
[985e0f204bf7ffac1f7c02fbec35ad9b] [127.0.0.1]
ActiveRecord::AssociationTypeMismatch (Photo(#2180069640) expected, got ActiveSupport::HashWithIndifferentAccess(#2153916820)):
app/controllers/microposts_controller.rb:9:in `create'
Microposts控制器创建操作：
def create
if params[:micropost][:user_id].to_i == current_user.id
@micropost = current_user.microposts.build(params[:micropost])
@comment = Comment.new(:user_id => current_user.id)
respond_to do |format|
if @micropost.save
format.js { render :post_on_springboard }
end
end
else
user = User.find_by_username(params[:micropost][:username])
@micropost = user.microposts.build(params[:micropost])
if @micropost.save
UserMailer.new_wall_post_notification(user, current_user).deliver if user.email_notification == 1
flash[:success] = "Micropost posted"
redirect_to root_path+user.username
else
flash[:error] = "#{@micropost.errors.full_messages.first}"
redirect_to root_path+user.username
end
end
end
答案 0 :(得分：1)
你要做的很多事情都与人际关系密切相关，你可以让铁路公约为你工作。如果你开始编写一堆代码来使用相当简单的rails，这通常是一个不好的标志。
我会首先关注你的路线。
例如，如果您将照片嵌入相册中，例如
resources :albums do
resources :photos
end
然后您将获得许多您想要的路径和功能。
确保您的表单使用form_for [@album, @post]之类的内容，这些内容会与您的accepts_nested_attributes_for
答案 1 :(得分：0)
尝试将：photo_attributes添加到微博模型中的attar_accessible列表
我认为应该解决第一个错误。
仍然看着第二个。
您可以从表单发布完整的堆栈跟踪，这可能是您的控制器方法的问题。
答案 2 :(得分：0)
更改
f.fields_for @photo
到
f.fields_for :photo
并添加
@micropost.build_photo(:photo_album_id => :photo_album_id => current_user.photo_albums.find_by_album_title("microposts album").id)
到我的microposts_controller修复了我的问题
答案 3 :(得分：0)
class Organization < ActiveRecord::Base
has_one :picture, :dependent => :destroy
accepts_nested_attributes_for :picture
attr_accessible :address, :contect_number, :email, :name, :type_of_organization, :picture_attributes
end
class Picture < ActiveRecord::Base
belongs_to :organization
mount_uploader :avatar, AvatarUploader
attr_accessible :avatar, :organization_id
end
class OrganizationsController < ApplicationController
load_and_authorize_resource
def new
@organization = Organization.new
# @organization.attributes = Picture.new
# @picture = Picture.new
end
def create
logger.info "++++++++inside the organisation controller++++++++++"
logger.info params[:organization].inspect
@org = Organization.new(params[:organization])
if @org.save
@picture = Picture.new(:avatar => params[:organization][:picture_attributes][:avatar])
@picture.organization_id = @org.id
@picture.save
logger.info "---------- inside Avtar controller ---------------"
logger.info @picture.inspect
session[:org_id] = @org.id
redirect_to new_admin_user_path :notice => 'Organization created successfully.'
else
render 'new'
end
end
end
<div>
<h4>FillUp organization details.</h4>
<%= form_for @organization, :url => organizations_path do |f| %>
<%= f.label :name, "Name" %>
<%= f.text_field :name %>
<%= f.label :contect_number, "Contact Number" %>
<%= f.text_field :contect_number %>
<%= f.label :address, "Address" %>
<%= f.text_field :address %>
<%= f.label :website, "Website" %>
<%= f.text_field :email %>
<%= f.label :company_type, "Type" %>
<%= f.text_field :type_of_organization %>
<%= f.fields_for :picture_attributes, :html => { :multipart => true } do |p| %>
<%= p.label :avatar, "My Avatar" %>
<%= p.file_field :avatar %><br/>
<%end%>
<%= f.submit :Create, :class => 'btn btn-primary' %>
<%end%>
</div>