Not all models cascade deletes about apollo

[blynchNDI]

Thanks @dodumosu , this makes sense given what I was seeing

[blynchNDI]

@dodumosu Just verifying that this is the same issue: when I go to delete anything from elections.demcloud.org (e.g. locations, participant sets, events, or forms), I get an error like the one below (in this case, when deleting a location)

Integrity error. (psycopg2.IntegrityError) null value in column "location_set_id" violates not-null constraint DETAIL: Failing row contains (11, d1, f, f, f, null, null). [SQL: 'UPDATE location_type SET location_set_id=%(location_set_id)s WHERE location_type.id = %(location_type_id)s'] [parameters: ({'location_set_id': None, 'location_type_id': 11}, {'location_set_id': None, 'location_type_id': 12}, {'location_set_id': None, 'location_type_id': 13})] (Background on this error at: http://sqlalche.me/e/gkpj)

[dodumosu]

@takinbo @stigsfoot @blynchNDI just want to point out that if we allow deletes on location or participant sets (ie, we enable the cascade delete), everything that depends on that data will be deleted too. for example, if you have checklists that are linked to the participant or location set, they will be deleted too. So, do we want to enable deletes or disable them?

[takinbo]

reviewing #95

[takinbo]

resolved.