Rails 4, has_many order: via. It just doesn't do anything

I have a situation like this:

class Student < ActiveRecord::Base
    has_many :tickets
    has_many :movies, through: :tickets
end


class Movie < ActiveRecord::Base
    has_many :tickets
    has_many :students, through: :tickets
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
end

      

        
        
        
      

    

I have this code in my controller ( movie_controller.rb ):

def show
  @tickets = @movie.tickets.includes(:student)
end

      

        
        
        
      

    

Now in my grid ( show.html.erb ) I have a situation like this:

<% @tickets.each do |ticket| %>
  <tr>
    <td><%= ticket.student.id %></td>
    <td><%= ticket.student.code %></td>
    <td><%= ticket.student.last_name %> <%= ticket.student.first_name %></td>
    <td><%= ticket.hours %></td>
    <td><% if ticket.payed %>Yes<% else %>No<% end %></td>
  </tr>
<% end %>

      

        
        
        
      

    

Now I want to order students by their "last_name, first_name", but if I use this code in my controller:

@tickets = @movie.tickets.includes(:student).order('students.last_name')

      

        
        
        
      

    

in my console I have a SQL query like this:

"AS t0_r0 .... AS t0_r1 ..."

etc. this is normal?

Am I wrong in my logic?

If I use code like this in my model:

class Movie < ActiveRecord::Base
    has_many :tickets
    has_many :students, -> { order('last_name, first_name') }, through: :tickets
end

      

        
        
        
      

    

nothing works . My list is ordered not by name and name, but by default (id).

How to make it better?

UPDATE

I have changed from the Children model to the Student model.