The question is this: how are you supposed to do it?
I’ve seen a lot of blog posts that say that HM:T has beaten HABTM and
that
we can now all easily have data on the join model and go on to show how
to
enter that data into the join model but don’t show a recommended way of
modifying it later.
I’ve checked against a pile of books, too, as well as the AR api and
Google’s exhaustive collection of blogs. Neither The Rails Way nor Agile
Web
Development show an example that I can find.
Obviously this is something really simple that I have missed so if
someone
could please post a link to the place where it is actually demonstrated
that
would be wonderful.
Taking the example from
has_many :through - New on edge: Magic join model creation if
you’re
unsure what I mean:
That automagically creates the join record with the role attribute set
to
has_many :contributors, :through => :contributions, :uniq => true
end
That’s brilliant (although I suspect it will break now because at some
point
with_scope got removed from public so I’m not sure what people suggest
nowadays).
What if you added another field to contributions? Let’s say, for lack of
a
better example, time_spent. This is how you are supposed to find it, as
far
as I can tell:
dave = Contributor.find_by_name “Dave”
book = Book.find_by_title “Agile Web D. with Rails”
contribution = Contribution.find_by_book_id_and_author_id book.id,
dave.id
And then you can now go
contribution.time_spent = 9.months
But surely there is a way to get that contribution object out of the
collection proxy? Something like:
contribution = dave.books.proxy_object(dave.books.first)
or
contribution = dave.books.proxy_objects.first
(Yes, I realise this would be essentially the same thing, but the method
I
showed first strikes me as being very non-rails).
So, is there some wonderful resource where this has been demonstrated
that
I’ve just missed?
Cheers,
Morgan.
when the project controller says e.g., Project.new(params[:project])