socialforge/app/models/course.rb

class Course < ActiveRecord::Base
  include Redmine::SafeAttributes
  
  attr_accessible :code, :extra, :name, :state, :tea_id, :time , :location, :state
  belongs_to :project, :class_name => 'Project', :foreign_key => :extra
  belongs_to :teacher, :class_name => 'User', :foreign_key => :tea_id  # 定义一个方法teacher，该方法通过tea_id来调用User表
  has_many :bid
  validates_presence_of :state
  safe_attributes 'extra',
  'time',
  'name',
  'extra',
  'code',
  'location',
  'tea_id',
  'state'
 

end