任何人都可以帮我解决以下错误。
NoMethodError in Homes#managebooks
Showing C:/Site/library_management1/app/views/homes/managebooks.html.erb where line #48 raised:
undefined method `book_name' for #<Array:0x229d340>
实际上我想在提交后将所有数据提取到现有表中。当我点击提交按钮时，所有数据都保存到数据库中，但之后就抛出了上述错误。请尽快帮助解决这些错误。 / p>
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">
<% if flash[:color]== "valid" %>
<div class="valid_notice">
<p><%= flash[:notice]%></p>
</div>
<% elsif flash[:color]== "invalid"%>
<div class="invalid_notice">
<p><%=flash[:notice]%></p>
</div>
<%else%>
<div class="notice">
<p><%=flash[:notice]%></p>
</div>
<%end%>
<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="#" >Manage Pages</a></li>
<li><a href="#" >Manage Header Banner</a></li>
<li><a href="#" >Brand</a></li>
</ul>
</div>
</div>
<div class="middlebox">
<center>
<%= form_for :books,:url => {:action => "savebooks"} do |f| %>
<fieldset>
<p>
<label for="name">Book name</label>
<%= f.text_field :book_name,placeholder:"enter book name" %>
</p>
<p>
<label for="tel">Book title</label>
<%= f.text_field :book_title,placeholder:"enter book title" %>
</p>
<p>
<label for="email">Author Name</label>
<%= f.text_field :author_name,placeholder:"enter book author name" %>
</p>
<p>
<label for="password">publisher Name</label>
<%= f.text_field :publisher_name,placeholder:"enter book publisher name" %>
</p>
<p>
<label for="password"> Edition</label>
<%= f.text_field :edition,placeholder:"enter book edition" %>
</p>
<p>
<label for="password">Pages</label>
<%= f.text_field :pages,placeholder:"enter book pages" %>
</p>
<p>
<label for="password"> Date of pursase</label>
<%= f.date_select :date_of_purchase %>
</p>
<p>
<%= f.submit "SUBMIT" %>
</p>
</fieldset>
<% end %>
</center>
<% if params[:id] %>
<table>
<tr>
<th>Book name</th>
<th>Book title</th>
<th>Author Name</th>
<th>publisher Name </th>
<th>Edition</th>
<th>Pages</th>
<th>Date of pursase</th>
<th>Status</th>
<th>Action</th>
</tr>
<tr>
<td><%= @books.book_name %></td>
<td><%= @books.book_title %></td>
<td><%= @books.author_name %></td>
<td><%= @books.publisher_name %></td>
<td><%= @books.edition %></td>
<td><%= @books.pages %></td>
<td><%= @books.date_of_purchase %></td>
<td><%= image_tag("/assets/1.png") %></td>
<td><%= link_to(
image_tag(
"/assets/logout.png",
:alt => "image", :width => 40, :height => 40, :title => "Delete item"
),
homes_remove_path(:id => @books.id),
:method => :delete, :confirm => "Are you sure to remove this?") %>
</td>
</tr>
</table>
<% end %>
</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.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
end
答案 0 :(得分：0)
更改erb代码的此部分：
<tr>
<td><%= @books.book_name %></td>
<td><%= @books.book_title %></td>
<td><%= @books.author_name %></td>
<td><%= @books.publisher_name %></td>
<td><%= @books.edition %></td>
<td><%= @books.pages %></td>
<td><%= @books.date_of_purchase %></td>
<td><%= image_tag("/assets/1.png") %></td>
<td><%= link_to(
image_tag(
"/assets/logout.png",
:alt => "image", :width => 40, :height => 40, :title => "Delete item"
),
homes_remove_path(:id => @books.id),
:method => :delete, :confirm => "Are you sure to remove this?") %>
</td>
</tr>
到此：
<% @books.each do |book| %>
<tr>
<td><%= book.book_name %></td>
<td><%= book.book_title %></td>
<td><%= book.author_name %></td>
<td><%= book.publisher_name %></td>
<td><%= book.edition %></td>
<td><%= book.pages %></td>
<td><%= book.date_of_purchase %></td>
<td><%= image_tag("/assets/1.png") %></td>
<td><%= link_to(
image_tag(
"/assets/logout.png",
:alt => "image", :width => 40, :height => 40, :title => "Delete item"
),
homes_remove_path(:id => book.id),
:method => :delete, :confirm => "Are you sure to remove this?") %>
</td>
</tr>
<% end %>
如果您在managebooks控制器中查看方法homes，则Book中存在:id时会创建一个params个对象数组。
注意：上述更改将再次失败，因为我们在each上使用@books方法，如果没有Book，则没有为新的:id对象定义在params。