Print list with select related with reverse foreign key

I have two models

http://paste.ideaslabs.com/show/BN0e2z4NSa

I want to print a list of ads (title,slug, and thumb_photo)

How can I make this list, since the key is reverse?

Something like this SQL: http://paste.ideaslabs.com/show/Iw8ii2noz

Sorry for my bad English.

I'm from brazil

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