Preventing Dups in HABTM

Rails
1

I have a habtm that looks like:

report
has_and_belongs_to_many :subscribers

subscriber
has_and_belongs_to_many :reports

When I add a report to a subscriber, I have to run code like:

raise “already there, idiot!” unless
report.subscribers.find_by_id(subscriber_id).nil?

Is there a better way to avoid adding duplicative associations? has_many
:through seems like overkill for this application.

Thanks

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2

You could put a unique constrain across the ids
in the DB, then add the association in a begin/
rescue block, thereby squashing the error if it’s
a duplicate.

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– Tom M.