fixing setup and hashing function of drugtargetinteraction model

Former-commit-id: 93c6fbde5bbe12f4bf187e342148a4b057b4d16c [formerly 0b8b26cd706cb971ecc5057c5a3c1195a315e2df]
Former-commit-id: 8d17661920148d84260fde8b1773d97d014e8d03

drugstone/models.py

@@ -335,7 +335,7 @@ class ProteinDrugInteraction(models.Model):
         return not self.__eq__(other)
 
     def __hash__(self):
-        return hash((self.pdi_dataset_id, self.protein_id, self.drug_id, self.actions))
+        return hash((self.pdi_dataset_id, self.protein_id, self.drug_id))
 
 
 class Task(models.Model):