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所以我想保存一个 HABTM 关系，但我的模型上有额外的字段，所以我使用 has_many 和 through 方法。这是我的模型：

#project_task.rb
class ProjectTask < ActiveRecord::Base
   attr_accessible :description, :name, :user_id, :project_id, :user_ids
   belongs_to :project
   belongs_to :user #Created by

   has_many :project_task_users #Here is the HABTM
   has_many  :users, :through => :project_task_users #AND HERE

   validates :name, :presence => true
   validates :project_task_users, :length => { :minimum => 1} #must have atleast 1 record in the HABTM relation
   accepts_nested_attributes_for :project_task_users
end

#project_task_user.rb
class ProjectTaskUser < ActiveRecord::Base
   belongs_to :user
   belongs_to :project_task
end

我的表格：

        <p>Users:</p>
        <% for user in @users %>
            <div>
              <%= check_box_tag "project_task[user_ids][]", user.id, @task.users.include?(user) %>
              <%= user.name %> - <%= user.company.name %>
            </div>
        <% end %>

我的控制器：

得到

def new_task
    @project = Project.find(params[:project_id])
    @task = ProjectTask.new(:project_id => @project.id)
    @users = @project.users
end

邮政

def new_task_post
    @project = Project.find(params[:project_id])
    @task = ProjectTask.new params[:project_task]
    @task.user_id = current_user.id
    if @task.save
      redirect_to @project
    else
      @users = @project.users
      render action:"new_task"
    end
  end

当我提交时，返回 false 和带有验证@task.save的错误数组project_task_users

更新

正如 Pablo89 指出的那样，我将我的 check_box_tag 重命名为这个 <%= check_box_tag :user_ids, user.id, @task.users.include?(user), :name => 'project_task[user_ids][]' -%> ，只有当我注释掉验证时它才会保存。在创建 project_task 时，我应该如何验证是否选择了用户？

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