I was expecting delete_all to be a more clever than what I'm seeing. I have 
an ActiveRecord::Relation which returns a bunch of records, but calling 
`delete_all` on that relation basically ignores any where condition and 
joins I used to find them. I think the right behaviour would be to delete 
those same returned records. 

Something like this: 

    SubscriptionTagging.joins(%q{
      LEFT OUTER JOIN subscriptions ON subscriptions.id = 
subscription_taggings.subscription_id
    }).where('subscriptions.id IS NULL').delete_all

Should I open an issue on github? I'm using Rails 3.2.12.

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