如何解决关系模型的rails 3脚手架
是否有任何教程可以建立一个使用多对多关系的简单模型？解决方法
我在Rails 3.0.5上使用ruby 1.9.2逐步创建以下testapp时编写了此教程。另请参阅\'Gemfile \'了解我使用的宝石（可下载整个Testapp，链接在第15部分的末尾）。因此，这里去：
1）转到您要创建测试应用的地方，然后
rails new mynewtestapp
cd mynewtestapp
rails g scaffold book title:string author:string
rails g scaffold user name:string age:integer
rails g migration createBooksUsers
class CreateBooksUsers < ActiveRecord::Migration
def self.up
end
def self.down
end
end
class CreateBooksUsers < ActiveRecord::Migration
def self.up
create_table :books_users,:id => false do |t|
t.integer :book_id
t.integer :user_id
end
end
def self.down
drop_table :books_users
end
end
class Book < ActiveRecord::Base
attr_accessible :title,:author,:user_ids
has_and_belongs_to_many :users
end
class User < ActiveRecord::Base
attr_accessible: :name,:age,:book_ids
has_and_belongs_to_many :books
end
rake db:create
rake db:migrate
echo \"gem \'simple_form\',:git => \'git://github.com/plataformatec/simple_form.git\'\" >> Gemfile
bundle install
rails g simple_form:install
01 <%= form_for(@book) do |f| %>
02 <% if @book.errors.any? %>
03 <div id=\"error_explanation\">
04 <h2><%= pluralize(@book.errors.count,\"error\") %> prohibited this book from being saved:</h2>
05
06 <ul>
07 <% @book.errors.full_messages.each do |msg| %>
08 <li><%= msg %></li>
09 <% end %>
10 </ul>
11 </div>
12 <% end %>
13
14 <div class=\"field\">
15 <%= f.label :title %><br />
16 <%= f.text_field :title %>
17 </div>
18 <div class=\"field\">
19 <%= f.label :author %><br />
20 <%= f.text_field :author %>
21 </div>
22 <div class=\"actions\">
23 <%= f.submit %>
24 </div>
25 <% end %>
01 <%= simple_form_for(@book) do |f| %>
02 <% if @book.errors.any? %>
03 <div id=\"error_explanation\">
04 <h2><%= pluralize(@book.errors.count,\"error\") %> prohibited this book from being saved:</h2>
05
06 <ul>
07 <% @book.errors.full_messages.each do |msg| %>
08 <li><%= msg %></li>
09 <% end %>
10 </ul>
11 </div>
12 <% end %>
13
14 <%= f.input :title %>
15 <%= f.input :author %>
16 <%= f.association :users %>
17
18 <%= f.button :submit %>
19
20 <% end %>
rails s
public/stylesheets/simple_form.css
/* public/stylesheets/simple_form.css */
.simple_form label {
float: left;
width: 100px;
text-align: right;
margin: 2px 10px;
}
.simple_form div.input {
margin-bottom: 10px;
}
.simple_form div.boolean,.simple_form input[type=\'submit\'] {
margin-left: 120px;
}
.simple_form div.boolean label,.simple_form label.collection_radio,.simple_form label.collection_check_boxes{
float: none;
margin: 0;
}
.simple_form .error {
clear: left;
margin-left: 120px;
font-size: 12px;
color: #D00;
display: block;
}
.simple_form .hint {
clear: left;
margin-left: 120px;
font-size: 12px;
color: #555;
display: block;
font-style: italic;
}
15 <%= f.input :author %>
15 <%= f.input :author,:as => :check_boxes %>
# You can wrap a collection of radio/check boxes in a pre-defined tag,defaulting to none.
config.collection_wrapper_tag = :fieldset
# You can wrap each item in a collection of radio/check boxes with a tag,defaulting to none.
config.item_wrapper_tag = :div
fieldset { border: 0; }
class User < ActiveRecord::Base
has_and_belongs_to_many :users
def to_label
\"#{name} (#{age})\"
end
end
01 <p id=\"notice\"><%= notice %></p>
02
03 <p>
04 <b>Title:</b>
05 <%= @book.title %>
06 </p>
07
08 <p>
09 <b>Author:</b>
10 <%= @book.author %>
11 </p>
12
13 <p>
14 <b>Who owns a copy?</b>
15 <%= @book.users.map {|x| x.to_label}.join \',\' %>
16 </p>
17
18 <%= link_to \'Edit\',edit_book_path(@book) %> |
19 <%= link_to \'Back\',books_path %>
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