Ruby on rails 使用关系的未初始化常量错误

我按照说明创建了一个模型课，其中有一个学生和一个老师（都是模型用户）以及一个课程开始日期

#Lesson Controller
class Lesson < ActiveRecord::Base
  belongs_to :student, class_name => 'User'
  belongs_to :teacher, class_name => 'User'
end

#User Controller
class User < ActiveRecord::Base
  has_many :lessons_to_attend, :class_name => 'Lesson', :foreign_key => 'student_id'
  has_many :lessons_to_teach, :class_name => 'Lesson', :foreign_key => 'teacher_id'
end

两件事：

belongs_to :student, class_name => 'User'
belongs_to :teacher, class_name => 'User'

类名上的语法错误。这应该是

：class\u name=>“User”

或

class\u name:“User”

另一件事是，我认为您需要在关联的两侧设置您的

反向

class Lesson < ActiveRecord::Base
  belongs_to :student, class_name: 'User', inverse_of: :lessons_to_attend
  belongs_to :teacher, class_name: 'User', inverse_of: :lessons_to_teach
end

class User < ActiveRecord::Base
  has_many :lessons_to_attend, class_name: 'Lesson', foreign_key: 'student_id', inverse_of: :student
  has_many :lessons_to_teach, class_name: 'Lesson', foreign_key: 'teacher_id', inverse_of: :teacher
end

课程
这里有一个输入错误：
属于：学生，班级名称=>“用户”
，应该是
：班级名称
。啊，太简单了！谢谢你
belongs_to :student, class_name => 'User'
belongs_to :teacher, class_name => 'User'

class Lesson < ActiveRecord::Base
  belongs_to :student, class_name: 'User', inverse_of: :lessons_to_attend
  belongs_to :teacher, class_name: 'User', inverse_of: :lessons_to_teach
end

class User < ActiveRecord::Base
  has_many :lessons_to_attend, class_name: 'Lesson', foreign_key: 'student_id', inverse_of: :student
  has_many :lessons_to_teach, class_name: 'Lesson', foreign_key: 'teacher_id', inverse_of: :teacher
end