Ruby on rails 为什么在使用表单时，它必须是当前用户而不是@user_Ruby On Rails_Ruby_Form For

Ruby on rails 为什么在使用表单时，它必须是当前用户而不是@user

ruby-on-rails ruby

Ruby on rails 为什么在使用表单时，它必须是当前用户而不是@user,ruby-on-rails,ruby,form-for,Ruby On Rails,Ruby,Form For,谢谢你抽出时间来看我。我有一个问题，我很困惑，但希望得到更好的理解。在我过去的项目中，我能够做到 <%= form_for @user, :html => { :multipart => true } do |f| %> <p class="editpage">Profile Picture: <%= f.file_field :avatar %></p> <%= f.submit %> <% end %>

谢谢你抽出时间来看我。我有一个问题，我很困惑，但希望得到更好的理解。在我过去的项目中，我能够做到

<%= form_for @user, :html => { :multipart => true } do |f| %>
 <p class="editpage">Profile Picture: <%= f.file_field :avatar %></p>
 <%= f.submit %>
<% end %>

终端内的错误

Started POST "/users" for 127.0.0.1 at 2015-08-25 02:04:55 +0900
Processing by UsersController#create as HTML
  Parameters: {"utf8"=>"✓",   "authenticity_token"=>"e3DrDAhJPV4vgma9tg7wk9g589ZRDNInynWlXDv7oJQ=", "user"=>  {"avatar"=>#<ActionDispatch::Http::UploadedFile:0x007f8784a00ec0 @tempfile=#  <Tempfile:/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/RackMultipart20150825-  4587-14jh732>,   @original_filename="10920917_10152994488342090_418253413398867864_n.jpg",   @content_type="image/jpeg", @headers="Content-Disposition: form-data;   name=\"user[avatar]\";   filename=\"10920917_10152994488342090_418253413398867864_n.jpg\"\r\nContent-Type:   image/jpeg\r\n">}, "commit"=>"Upload"}
Command :: file -b --mime  '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c7 20150825-4587-1ka91nc.jpg'
Command :: identify -format '%wx%h,%[exif:orientation]'  '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c7 20150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "200x200>" '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1alffdu'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1alffdu'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "120x" -crop "120x120+0+20" +repage '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1kd13uh'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1kd13uh'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "75x" -crop "75x75+0+12" +repage '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1recdb2'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1recdb2'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1vsru58'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1vsru58'
   (0.4ms)  begin transaction
   Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1ksrnek.jpg'
   (0.1ms)  rollback transaction
Redirected to http://localhost:3000/
Completed 302 Found in 625ms (ActiveRecord: 0.5ms)

class User < ActiveRecord::Base

  extend FriendlyId
  friendly_id :user_name, use: :slugged

  has_many :conversations, :foreign_key => :sender_id
  after_create :create_default_conversation

  has_attached_file :avatar, :styles => {
   :medium => "200x200>",
   :small => "120x120#",
   :thumb => "75x75#",
   :default_url => "http://www.adtechnology.co.uk/images/UGM-default-user.png"
  }

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

  has_attached_file :background, :styles => {
   :medium => "200x200>",
   :small => "120x120#",
   :thumb => "75x75#",
   :default_url => "http://www.adtechnology.co.uk/images/UGM-default-user.png"
  }

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

  validates :password, presence: true, on: :create

end

于2015-08-25 02:04:55+0900开始发布127.0.0.1版的“/users”
由UsersController处理#创建为HTML
参数：{“utf8”=>“✓",   "真实性令牌“=>”e3DrDAhJPV4vgma9tg7wk9g589ZRDNInynWlXDv7oJQ=“，“用户”=>{“化身”=>，“提交”=>“上传”}
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C7 20150825-4587-1ka91nc.jpg'
命令：：标识-格式“%wx%h，%[exif:orientation]”/var/folders/83/2R02TQ2D334D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C7 20150825-4587-1p9nueh.jpg[0]”2>/dev/null
命令：：identify-格式%m'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]'
命令：：convert'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]-自动定向-调整“200x200>”/var/folders/83/2R02TQ2D33934D30SYFMPZ9YW0000GN/T/47A0270857535577774697C8014AD69C720150825-4587-1p9nueh20150825-4587-1alffdu'
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343DD30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh20150825-4587-1alffdu'
命令：：标识-格式“%wx%h，%[exif:orientation]”/var/folders/83/2R02TQ2D334D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]”2>/dev/null
命令：：identify-格式%m'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]'
命令：：convert'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]-自动定向-调整大小“120x”-裁剪“120x120+0+20”+repage'/var/folders/83/2R02TQ2D339D30SYFMPZ9YW0000GN/T/47A0270857535574775777C807AD69C720150825-4587-1K9NU20150825-1kd13uh
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343DD30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh20150825-4587-1kd13uh'
命令：：标识-格式“%wx%h，%[exif:orientation]”/var/folders/83/2R02TQ2D334D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]”2>/dev/null
命令：：identify-格式%m'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]'
命令：：convert'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]-自动定向-调整大小“75x”-裁剪“75x75+0+12”+重新分页'/var/folders/83/2R02TQ2D339D30SYFMPZ9YW0000GN/T/47A0270857575773557477C8014AD69C720150825-4587-1PEH20150825-1REC
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343DD30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh20150825-4587-1recdb2'
命令：：标识-格式“%wx%h，%[exif:orientation]”/var/folders/83/2R02TQ2D334D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]”2>/dev/null
命令：：identify-格式%m'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]'
命令：：convert'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh.jpg[0]-自动定向'/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47A027085753557467C8014AD69C720150825-4587-1p9nueh20150825-4587-1vsru58'
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343DD30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1p9nueh20150825-4587-1vsru58'
（0.4ms）开始事务处理
命令：：file-b--mime'/var/folders/83/2R02TQ2D39343D30SYFMPZ9YW0000GN/T/47A02708575355774697C8014AD69C720150825-4587-1ksrnek.jpg'
（0.1ms）回滚事务
重定向到http://localhost:3000/
625ms内完成302次（ActiveRecord:0.5ms）

**用户控制器*

class UsersController < ApplicationController
 def index
  @user = User.new
  @users = User.all
  # if current_user
  #   @leaders = @current_user.leaders
  # end
 end

 def create
  @user = User.new(user_params)
  if @user.save
   session[:user_id] = @user.id
   cookies[:user_id] = @user.id
   flash[:notice] = "Successfully Registerd"
   redirect_to "/"
  else
   flash[:alert] = @user.errors.full_messages
   redirect_to "/"
  end
 end

 def new
  @user = User.new
 end

 def edit
  @user = User.friendly.find(params[:id])
  current_user
 end

 def show
  @user = User.friendly.find(params[:id])
  current_user
  # if @current_user
  #    @followerlink = Follow.where(leader_id: @user.id,
  #                               follower_id: @current_user.id).first
  # end
 end

 def update
  @user = User.friendly.find(params[:id])
  if @user.update(user_params)
    flash[:notice] = "You have successfully update your information"
    redirect_to "/"
  end
 end

 def destroy
  @user = User.friendly.find(params[:id])
  @user.destroy
 end


 def user_params
  params.require(:user).permit(:background, :username_or_email, :first_name,   :last_name, :email, :password, :password_confirmation, :user_name, :avatar)
 end
end

class UsersController


用户模型
Started POST "/users" for 127.0.0.1 at 2015-08-25 02:04:55 +0900
Processing by UsersController#create as HTML
  Parameters: {"utf8"=>"✓",   "authenticity_token"=>"e3DrDAhJPV4vgma9tg7wk9g589ZRDNInynWlXDv7oJQ=", "user"=>  {"avatar"=>#<ActionDispatch::Http::UploadedFile:0x007f8784a00ec0 @tempfile=#  <Tempfile:/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/RackMultipart20150825-  4587-14jh732>,   @original_filename="10920917_10152994488342090_418253413398867864_n.jpg",   @content_type="image/jpeg", @headers="Content-Disposition: form-data;   name=\"user[avatar]\";   filename=\"10920917_10152994488342090_418253413398867864_n.jpg\"\r\nContent-Type:   image/jpeg\r\n">}, "commit"=>"Upload"}
Command :: file -b --mime  '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c7 20150825-4587-1ka91nc.jpg'
Command :: identify -format '%wx%h,%[exif:orientation]'  '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c7 20150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "200x200>" '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1alffdu'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1alffdu'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "120x" -crop "120x120+0+20" +repage '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1kd13uh'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1kd13uh'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient -resize "75x" -crop "75x75+0+12" +repage '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1recdb2'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1recdb2'
Command :: identify -format '%wx%h,%[exif:orientation]' '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' 2>/dev/null
Command :: identify -format %m '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]'
Command :: convert '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh.jpg[0]' -auto-orient '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1vsru58'
Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1p9nueh20150825-4587-1vsru58'
   (0.4ms)  begin transaction
   Command :: file -b --mime '/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/47a027085753557774697c8014ad69c720150825-4587-1ksrnek.jpg'
   (0.1ms)  rollback transaction
Redirected to http://localhost:3000/
Completed 302 Found in 625ms (ActiveRecord: 0.5ms)

class User < ActiveRecord::Base

  extend FriendlyId
  friendly_id :user_name, use: :slugged

  has_many :conversations, :foreign_key => :sender_id
  after_create :create_default_conversation

  has_attached_file :avatar, :styles => {
   :medium => "200x200>",
   :small => "120x120#",
   :thumb => "75x75#",
   :default_url => "http://www.adtechnology.co.uk/images/UGM-default-user.png"
  }

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

  has_attached_file :background, :styles => {
   :medium => "200x200>",
   :small => "120x120#",
   :thumb => "75x75#",
   :default_url => "http://www.adtechnology.co.uk/images/UGM-default-user.png"
  }

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

  validates :password, presence: true, on: :create

end

class用户：发件人\u id
创建后：创建默认对话
已附加文件：头像，：样式=>{
：medium=>“200x200>”，
：small=>“120x120#”，
：thumb=>“75x75#”，
：默认url=>“http://www.adtechnology.co.uk/images/UGM-default-user.png"
}
验证\u附件\u内容\u类型：头像，：内容\u类型=>/\Aimage\/.\Z/
已附加文件：背景，：样式=>{
：medium=>“200x200>”，
：small=>“120x120#”，
：thumb=>“75x75#”，
：默认url=>“http://www.adtechnology.co.uk/imag
Processing by UsersController#create as HTML

<%= form_for @user, :method => :PUT , :html => { :multipart => true }  do |f| %

has_secure_password 
validates :password, presence: true, allow_nil: true 

  @user.inspect
  current_user.inspect

User.inspect

validates :password, presence: true, on: :create

Parameters: {"utf8"=>"✓",   "authenticity_token"=>"e3DrDAhJPV4vgma9tg7wk9g589ZRDNInynWlXDv7oJQ=", "user"=>  {"avatar"=>#<ActionDispatch::Http::UploadedFile:0x007f8784a00ec0 @tempfile=#  <Tempfile:/var/folders/83/2r02tq2d3934d30syfmpz9yw0000gn/T/RackMultipart20150825-  4587-14jh732>,   @original_filename="10920917_10152994488342090_418253413398867864_n.jpg",   @content_type="image/jpeg", @headers="Content-Disposition: form-data;   name=\"user[avatar]\";   filename=\"10920917_10152994488342090_418253413398867864_n.jpg\"\r\nContent-Type:   image/jpeg\r\n">}, "commit"=>"Upload"}