其实我想在管理端页面上显示Magazine模型的所有数据但是我在尝试获取管理端的所有数据时遇到以下错误（即http://localhost:3000/homes/magazineissue).I也想显示一些属于User的值通过用户的身份证明。
NoMethodError in HomesController#magazineissue
undefined method `user_id' for #<Array:0x2780b98>
Rails.root: C:/Site/library_management1
Application Trace | Framework Trace | Full Trace
app/controllers/homes_controller.rb:100:in `magazineissue'
我的代码如下。
<% if admin_signed_in? %>
<div class="bar">
Logged in as <strong><%= current_admin.email %></strong>.
<%= link_to 'Edit profile', edit_admin_registration_path, :class => 'navbar-link' %> |
<%= link_to "Logout", destroy_admin_session_path, method: :delete, :class => 'navbar-link' %>
</div>
<% else %>
<%= link_to "Sign up", new_admin_registration_path, :class => 'navbar-link' %> |
<%= link_to "Login", new_admin_session_path, :class => 'navbar-link' %>
<% end %>
<div class="big-container">
<div class="admin-image">
<div class="bpaddingdiv1"><img src="/assets/admin.png" border="0" name="admin" /></div>
</div>
<div class="borderlightgreen"></div>
<div class="admin-name">
<div class="tpaddingdiv2 textaligncenterdiv"><img src="/assets/adminpanel.png" border="0" name="admin" /></div>
</div>
<div class="leftside">
<div id="leftsidebtn">
<ul>
<li><a href="/homes/managebooks">Manage Books</a></li>
<li><a href="/homes/userissues" >User Issues</a></li>
<li><a href="/homes/magazineissue" >Magazine Issues</a></li>
</ul>
</div>
</div>
<div class="middlebox">
<center>
<table>
<thead>
<tr>
<th>First Name</th>
<th>Email Id</th>
<th>Magazine Name</th>
<th>Magazine Title</th>
<th>Purchased on</th>
<th>CD/DVD</th>
</tr>
</thead>
<tbody>
<% @magazines.each do |magazine| %>
<tr>
<td><%= @users.first_name %></td>
<td><%= @users.email %></td>
<td><%= magazine.mag_name %></td>
<td><%= magazine.mag_title %></td>
<td><%= magazine.purchased_on %></td>
<td><%= magazine.cd_dvd %></td>
</tr>
<% end %>
</tbody>
</table>
</center>
</div>
</div>
class HomesController < ApplicationController
before_filter :authenticate_admin!,only: [:admin]
def index
end
def admin
end
def managebooks
@books=Book.new
if params[:id]
@books=Book.find(params[:id])
@book=Book.all
end
end
def savebooks
@books=Book.new(params[:books])
if @books.save
flash[:notice]="Data has submitted successfully"
flash[:color]="valid"
redirect_to :action => 'managebooks',:id => @books.id
else
flash[:notice]="Data couldnot submitted successfully"
flash[:color]="invalid"
render 'managebooks'
end
end
def remove
@books=Book.find(params[:id])
@books.destroy
end
def books
end
def showbooks
@books=Book.all
end
def searchbooks
@books=Book.all
end
def member
@users=User.new
end
def registration
@users=User.new
end
def savedata
@users=User.new(params[:users])
if @users.save
flash[:notice]="Data has submitted successfully"
flash[:color]="valid"
redirect_to :action => 'member'
else
flash[:notice]="Data could not submitted successfully"
flash[:color]="invalid"
render 'registration'
end
end
def issuebooks
@issues=Issue.new
end
def savedissuebooks
@issues=Issue.new(params[:issues])
if @issues.save
flash[:notice]="information has saved successfully"
flash[:color]="valid"
redirect_to :action => 'member'
else
flash[:notice]="Data couldnot saved"
flash[:color]="invalid"
render 'issuebooks'
end
end
def availablebooks
@books=Book.all
end
def userissues
@issues=Issue.all
end
def magazine
@magazines=Magazine.new
end
def savemagazines
@users=User.find(params[:id])
@magazines=Magazine.new(params[:magazines])
@magazines.user_id=@users.id
if @magazines.save
flash[:notice]="Data submitted successfully"
flash[:color]="valid"
redirect_to :action => "member"
else
flash[:notice]="Data could not saved"
flash[:color]="invalid"
render 'magazines'
end
end
def magazineissue
@magazines=Magazine.all
@users=User.find(@magazines.user_id)
end
end
class CreateMagazines < ActiveRecord::Migration
def change
create_table :magazines do |t|
t.string :mag_name
t.boolean :cd_dvd
t.decimal :cost, :precision => 8, :scale => 2
t.date :purchased_on
t.string :mag_title
t.integer :user_id
t.timestamps
end
end
end
class Magazine < ActiveRecord::Base
attr_accessible :cd_dvd, :cost, :mag_name, :mag_title, :purchased_on
belongs_to :user
end
class User < ActiveRecord::Base
attr_accessible :address, :email, :first_name, :last_name, :password, :password_hash, :password_salt, :tel_no ,:password_confirmation
attr_accessor :password
before_save :encrypt_password
EMAIL_REGEX = /\A[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\z/i
validates :email, :presence => true, :uniqueness => true, :format => EMAIL_REGEX
validates :first_name, :presence => true, :length => {:in => 3..10}
validates :last_name , :presence => true , :length => {:in => 3..10}
validates :tel_no , :presence => true , :length => {:in => 1..10}
validates :password, :confirmation => true
validates_length_of :password, :in => 6..20, :on => :create
def self.authenticate(email, password)
user = find_by_email(email)
if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
user
else
nil
end
end
def encrypt_password
if password.present?
self.password_salt = BCrypt::Engine.generate_salt
self.password_hash = BCrypt::Engine.hash_secret(password, password_salt)
end
end
has_many :issue
has_many :book
has_many :magazine
end
请帮我解决此错误。
答案 0 :(得分：0)
问题在于您已经提到的控制器 - 让我们来看看：
def magazineissue
@magazines=Magazine.all
@users=User.find(@magazines.user_id)
end
在这里，您提取Array Magazine个 - Array没有id方法。我想你想做的是：
def magazineissue
@magazines=Magazine.all
@users=User.find(@magazines.map(&:user_id))
end
通过所有User获取Magazine秒。
让我知道它是否有帮助！
<强>更新
从评论中我们看起来你正试图实现类似的目标：
def magazineissue
@magazines=Magazine.includes(:user).all
end
在您看来，将<table>更改为：
<table>
<thead>
<tr>
<th>First Name</th>
<th>Email Id</th>
<th>Magazine Name</th>
<th>Magazine Title</th>
<th>Purchased on</th>
<th>CD/DVD</th>
</tr>
</thead>
<tbody>
<% @magazines.each do |magazine| %>
<tr>
<td><%= magazine.user.first_name %></td>
<td><%= magazine.user.email %></td>
<td><%= magazine.mag_name %></td>
<td><%= magazine.mag_title %></td>
<td><%= magazine.purchased_on %></td>
<td><%= magazine.cd_dvd %></td>
</tr>
<% end %>
</tbody>
</table>
答案 1 :(得分：0)
正如您所定义的那样：
@magazines = Magazine.all
它产生一个包含所有杂志的数组。
现在你正在做HomeController：
@magazines.user_id
引发：
undefined method `user_id' for #<Array:0x2780b98>
因为如上所述@magazines是一个数组。
解决此问题的方法是从返回的Magazine数组中选择一个特定的@magazines对象并继续。
一个简单的例子可以是：
@users=User.find @magazines.first.user_id
# However this is just for sake of example.
# You may want to select an object from the Array more wisely.