D, [2017-03-23T21:19:33.713767 #1] DEBUG -- :    (0.4ms)  ROLLBACK
rake aborted!
NameError: undefined local variable or method `a' for #<Ad:0x0055872538f4a8>
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               ai
/box/gems/activemodel-5.0.0.1/lib/active_model/attribute_methods.rb:433:in `method_missing'
/app/app/models/ad.rb:79:in `block in extract_targets'
/app/app/models/ad.rb:78:in `each'
/app/app/models/ad.rb:78:in `extract_targets'