更新连接表字段

Question

class Job < ActiveRecord::Base    
has_many :employments, :dependent => :destroy
has_many :users, :through => :employments

class User < ActiveRecord::Base
has_many :employments 
has_many :jobs, :through => :employments

class Employment < ActiveRecord::Base
belongs_to :job
belongs_to :user  # Employment has an extra attribute of confirmed ( values are 1 or 0)

在我看来，我试图在用户点击时将确认的fied从0更新为1.

<%= link_to "Confirm Job", :action => :confirmjob, :id => job.id %>

在我的工作控制器中我有

def confirmjob
  @job = Job.find(params[:id])
  @job.employments.update_attributes(:confirmed, 1)
  flash[:notice] = "Job Confirmed"
  redirect_to :dashboard
end

我确信这一切都是错的，但我似乎在猜测has_many：通过。 如何更新已连接表中的已确认字段？

Answer 1

我认为就业分配给用户。因此，正如乔尔所说，更新所有就业并不是一个好主意。我会推荐这个：

class Employment
  def self.confirm!(job)
    employment = Employment.find(:first, :conditions => { :job_id => job.id } )
    employment.update_attribute(:confirmed, true)
  end
end

来自您的控制器

@job = Job.find(params[:id])
Employment.confirm!(@job)

这意味着一个作业只能由一个用户执行。

Answer 2

这是对它的攻击（未经测试）：

def confirmjob
  @job = Job.find(params[:id])
  @jobs.employments.each do |e|
    e.update_attributes({:confirmed => 1})
  end
  flash[:notice] = "Job Confirmed"
  redirect_to :dashboard
end