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我有这个型号:

class Student < ActiveRecord::Base

    has_many :tickets
    has_many :movies, through: :tickets

end


class Movie < ActiveRecord::Base

    has_many :tickets, dependent: :destroy
    has_many :students, through: :tickets
    belongs_to :cinema

end


class Ticket < ActiveRecord::Base

    belongs_to :movie, counter_cache: true
    belongs_to :student

end


class Cinema < ActiveRecord::Base

    has_many :movies, dependent: :destroy
    has_many :students, through: :movies

    has_many :schools, dependent: :destroy
    has_many :companies, through: :yard_companies

end


class School < ActiveRecord::Base 

    belongs_to :company
    belongs_to :student
    belongs_to :cinema, counter_cache: true

end


class Teacher < ActiveRecord::Base

    belongs_to :movie, counter_cache: true …