ruby-on-rails – Rails“ActiveRecord_Associations_Collection

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,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
    belongs_to :company

end


class Contract < ActiveRecord::Base

    belongs_to :company
    belongs_to :student

end


class Company < ActiveRecord::Base

    has_many :teachers
    has_many :movies,through: :teachers

    has_many :contracts
    has_many :students,through: :contracts

end

如果我在movies_controller.rb中写这个：

@students = @ movie.cinema.companies.students.all

我有这个错误：

未定义的方法’学生’为#Company :: ActiveRecord_Associations_CollectionProxy：0x00000007f13d88>

如果相反我写这个：

@students = @ movie.cinema.companies.find(6).students.all

它在我的select_collection中显示了正确的学生.

如何更好地理解这个过程？

更新：

我需要收集这部电影电影公司中每个学生的收藏.

怎么写？