Mongoid collection name

file1

require 'mongoid'
class A
end
 
class B
end
 
class Book
  include Mongoid::Document
end
 
a_book = A.const_set(:Book, Class.new(Book))
a_book.store_in collection: 'a_books'
 
b_book = B.const_set(:Book, Class.new(Book))
b_book.store_in collection: 'b_books'
 
A::Book.collection_name  #:b_books, it should return :a_books, right?
B::Book.collection_name  #:b_books

file2

require 'mongoid'
class A
end
 
class B
end
 
class Book
  include Mongoid::Document
end
 
a_book = A.const_set(:Book, Class.new(Book))
a_book.store_in collection: 'a_books'
A::Book.collection_name  #:a_books, need to call this method after set.
 
b_book = B.const_set(:Book, Class.new(Book))
b_book.store_in collection: 'b_books'
B::Book.collection_name  #:b_books, need to call this method after set.
 
A::Book.collection_name  #:a_books, then it displays correctly.
B::Book.collection_name  #:b_books, the same here