Question

我有一些这样的模型：

class Student < ActiveRecord::Base
  belongs_to :Teacher
  scope :rich_students, joins(:teachers).order('students.money DESC')
end

然后是班主任

class Teacher < ActiveRecord::Base
  has_many :students
  belongs_to :Organization
end

然后：

class Organization < ActiveRecord::Base
  has_many :teachers 
end

现在我写一个这样的查询：

Student.rich_students.joins(:teachers).where("teachers.organization_id = ?", params[:id]).limit(5)

但这不起作用。它给了我错误：

Association named 'teachers' was not found;

Answer 1

不应该加入

Student.rich_students.joins（：教师）

Answer 2

我认为您的学生“belongs_to”声明中存在错误，应该是

class Student < ActiveRecord::Base
  belongs_to :teacher
  scope :rich_students, joins(:teachers).order('students.money DESC')
end

“：老师”而不是“：老师”

希望它可能是事情的原因......

干杯