在我的 member_profile 表单中，我希望拥有对管理员可见的角色复选框。我想使用一些嵌套的form_for，但不能让它工作，所以我求助于手动创建check_box_tags（见下文），然后手动将它们添加到member_profile.member。
请注意，成员模型是设计，我不想将这些字段与我的成员配置文件数据混合，以防我将来更改身份验证系统。
class Member < ActiveRecord::Base
has_one :member_profile
has_many :member_roles
has_many :roles, :through => :member_roles
end
class MemberProfile < ActiveRecord::Base
belongs_to :member
has_many :member_roles, :through => :member
#has_many :roles, :through => :member_roles #can't make this work work
end
class Role < ActiveRecord::Base
has_many :member_roles
validates_presence_of :name
end
class MemberRole < ActiveRecord::Base
belongs_to :member
belongs_to :role
end
形式 (haml)
= form_section do
- Role.all.each do |x|
=check_box_tag 'member[role_ids][]',
x.id,
begin @resource.member.role_ids.include?(x.id) rescue nil end
=x.name
member_profiles_controller.rb
def update
if @resource.update_attributes params[:member_profile]
@resource.member.role_ids = params[:member][:role_ids]
redirect_to(@resource, :notice => 'Member profile was successfully updated.')
else
render :action => "edit"
end
end