Hello, newbie here…
I have the following models:
class Instance < ActiveRecord::Base
has_many :users
has_many :books
end
class User < ActiveRecord::Base
belongs_to :instance
end
class Book < ActiveRecord::Base
belongs_to :instance
end
I now want to add a BookRevision table, that has the following columns
(id, user_id, version # (auto increment), diff (old book copy),
timestamps)
Logic:
- When a book is Created, a record is added to the BookRevision
table, so we know who created the book in the first place - When a book is Updated, a record is added with the user_id (could
be a different user), and a new version #, and the old book text, to
serve as an archive.
Given that I have the Instance, User, Book table implement in my rails
add, are these the correct steps to make the above come to life?
- Add a migration for the BookRevision table…
rails generate migration AddTableBookRevision user_id:integer
version:integer diff:text - Then update the models as follows:
class Instance < ActiveRecord::Base
has_many :users
has_many :books
end
class User < ActiveRecord::Base
belongs_to :instance
end
class Book < ActiveRecord::Base
belongs_to :instance
has_many :BookRevisions
end
class BookRevision < ActiveRecord::Base
belongs_to :Book
end
Then in my controller, when adding a new book? Right now I have:
@book = Book.create(params[:book].merge(:instance_id =>
current_user.instance_id))
How do I update that to account for the BookRevision association?
Thanks for helping me out!