问题描述
Model:
app/models/group.rb
class Group < ActiveRecord::Base has_many :group_members has_many :members, :through => :group_membersend
app/models/member.rb
class Member < ActiveRecord::Base has_many :group_members has_many :groups, :through => :group_membersend
app/models/group_members.rb
class GroupMember < ActiveRecord::Base belongs_to :group belongs_to :memberend
View:
app/views/groups/new.html.erb
<p class='control-group'> <%= f.label :name, :class => 'control-label' %> <p class='controls'><%= f.text_field :name, :class => 'input-xxlarge' %> </p></p>
'control-label' %>
Controller:
app/controller/groups_controller.rb
def new @group = Group.newenddef edit @group = Group.find(params[:id])enddef create # How to do?enddef update # How to do?end
最后在控制器中怎么保存多个成员（members）到数据库？
问题解答
回答1：这个好多地方都有解答， 如果英文好的话，可以看看这一个Railscasts:
http://railscasts.com/episodes/196-nested-model-form-revised
Rails 4.0依然支持Nested Attributes, 具体的文档可以看这里。
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html
