The API docs for habtm don't include mention of #build or #create as
methods on the association. However, both methods exist in the
HasAndBelongsToManyAssociation class. HABTM implements #build, while
#create is inherited from AssociationCollection. #build seems to
work fine, though there aren't any tests for it. On the other hand,
while #create will build and save the associated object, it doesn't
create a row in the join table.
I think it's an easy fix to get #create working, at least it looks
like it. But since these methods aren't documented I'm not sure
what's going on. Were they left out of the docs by accident, or was
that intentional because of some subtle problem preventing a solid
implementation? Is the broken code there a leftover that was meant
to be removed, or an attempt that was meant to be finished later.
If the answer is that #build and #create should be supported in
habtm, I can open a ticket and see what I can do about fixing #create
and getting some tests written. If the answer is they are leftover
garbage, we should probably excise them so people aren't confused by
broken behavior.
--
Josh Susser
http://blog.hasmanythrough.com
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