Include only the latest/newest associated record with active record?
- by railsnewbie
is it possible to load only the latest associated record of an associated table?
an example:
class author
attr_accessible :first_name, :last_name, :birthday
has_many :books
end
class book
attr_accessible :pages, :date of publication, :title
belongs_to :author
end
Is there a way to generate a scope to load only the newest released book the author wrote? Or the book with the most pages?
I know, that I could include or join all books. But I don't know if its possible to load only a specific book for each author.
So that I could do a query like this:
Author.authors_and_their_newest_book
So that I could get these results
first_name_author_1, last_name_author_1, birthday_author_1, pages_book_3, date of publication_book_3, title_book_3
first_name_author_2, last_name_author_2, birthday_author_2, pages_book_5, date of publication_book_5, title_book_5
first_name_author_3, last_name_author_3, birthday_author_3, pages_book_9, date of
publication_book_9, title_book_9
...
