Hi Brian,
> Anyway, just wanted to make the goal clear. Cross repository
> relationships (although I'm pretty sure works fine today), and the
> ability to use multiple repositories for a single [finder] operation.
This is a pretty interesting use case, that I must admit I've never
considered before. I actually don't think it'd be too hard to do,
although it will require a bit of patching until the API needed is
more clear.
How I'd approach this is write a subclass of DataMapper::Repository,
and I'd make it so the read() method executes the same query against
each of the repos, and concats the results into a single Array. You
could even use Query#filter_records to match/sort/limit the results if
necessary. Return the array from read(), and it'll be turned into a
Collection object, which you can use as normal.
The nice thing is that updating a single Resource in the Collection
should propagate back to the correct shard. The only tricky part
might be that if you do any bulk operations on the collection (like
Collection#update! or Collection#destroy!) you might have to have your
Repository object handle propagating the update() and delete() calls
to each shard, much like you did with read().
I was thinking something along the lines of:
# get the first active subscriber with a subscription
subscriber = Subscription.all.subscribers(:active => true).first
users = CustomRepository.new(:composite, [ :db1, :db2, :db3 ]).scope
do
# should execute with the repository, assuming the relationship is
not absolute
subscriber.users
end
Granted this is a bit ugly, and we can work out a better API for this
over time, but I'd like to make sure the specific strategy works as-is
before modifying the API to make it cleaner.
Dan
(dkubb)
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