fix assignment overrides applicator spec for rails 3
fix assignment overrides applicator spec for rails 3

in rails 3, even MemoryStore marshals/unmarshalls, so we can't check object_ids

Change-Id: I53ea94418cd3a578c3fca52352d8b81b95478acb
Reviewed-on: https://gerrit.instructure.com/30830
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Derek DeVries <ff87a0776152510efd53bb1f4ea089dbbc90e730@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

fronteerio/canvas-lms,arrivu/hoodemo,instructure/canvas-lms,narigone/canvas,dgynn/canvas-lms,whalejasmine/canvas-lms,redconfetti/canvas-lms,wye0220/shindig-canvas,antoniuslin/canvas-lms,matematikk-mooc/canvas-lms,redconfetti/canvas-lms,va7map/canvas-lms,HotChalk/canvas-lms,utkarshx/canvas-lms,jay3126/canvas-lms,AndranikMarkosyan/lms,sfu/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,wye0220/shindig-canvas,instructure/canvas-lms,samuels410/greatlakes-lms,AndranikMarkosyan/lms,sfu/canvas-lms,eCNAP/CANVAS,kyroskoh/canvas-lms,juoni/canvas-lms,eCNAP/CANVAS,djbender/canvas-lms,arrivu/arrivu-lms,fronteerio/canvas-lms,sfu/canvas-lms,wye0220/shindig-canvas,grahamb/canvas-lms,instructure/canvas-lms,usmschuck/canvas,samuels410/greatlakes-lms,tgroshon/canvas-lms,matematikk-mooc/canvas-lms,utkarshx/canvas-lms,gbleydon/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,dgynn/canvas-lms,djbender/canvas-lms,sdeleon28/canvas-lms,ShreniiNepal/shrenii_lmp,wrdsb/canvas-lms,jay3126/canvas-lms,sdeleon28/canvas-lms,antoniuslin/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,gbleydon/canvas-lms,usmschuck/canvas,AndranikMarkosyan/lms,tgroshon/canvas-lms,samuels410/greatlakes-lms,matematikk-mooc/canvas-lms,ShreniiNepal/shrenii_lmp,instructure/canvas-lms,HotChalk/canvas-lms,arrivu/arrivu-lms,Jyaasa/canvas-lms,utkarshx/canvas-lms,efrj/canvas-lms,greyhwndz/canvas-lms,arrivu/hoodemo,jay3126/canvas-lms,snehakachroo1/LSI_replica,dgynn/canvas-lms,efrj/canvas-lms,usmschuck/canvas,roxolan/canvas-lms,utkarshx/canvas-lms,kyroskoh/canvas-lms,whalejasmine/canvas-lms,HotChalk/canvas-lms,greyhwndz/canvas-lms,greyhwndz/canvas-lms,va7map/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,grahamb/canvas-lms,narigone/canvas,Rvor/canvas-lms,AndranikMarkosyan/lms,gbleydon/canvas-lms,jay3126/canvas-lms,kyroskoh/canvas-lms,grahamb/canvas-lms,greyhwndz/canvas-lms,va7map/canvas-lms,whalejasmine/canvas-lms,instructure/canvas-lms,skmezanul/canvas-lms,narigone/canvas,whalejasmine/canvas-lms,tgroshon/canvas-lms,juoni/canvas-lms,snehakachroo1/LSI_replica,ShreniiNepal/shrenii_lmp,roxolan/canvas-lms,Unow/canvas-lms,Unow/canvas-lms,venturehive/canvas-lms,skmezanul/canvas-lms,shidao-fm/canvas-lms,sdeleon28/canvas-lms,antoniuslin/canvas-lms,Jyaasa/canvas-lms,shidao-fm/canvas-lms,roxolan/canvas-lms,djbender/canvas-lms,ShreniiNepal/shrenii_lmp,SwinburneOnline/canvas-lms,tgroshon/canvas-lms,arrivu/hoodemo,Jyaasa/canvas-lms,Rvor/canvas-lms,juoni/canvas-lms,shidao-fm/canvas-lms,wrdsb/canvas-lms,Unow/canvas-lms,redconfetti/canvas-lms,leftplusrightllc/canvas-lms,redconfetti/canvas-lms,kyroskoh/canvas-lms,Rvor/canvas-lms,grahamb/canvas-lms,efrj/canvas-lms,dgynn/canvas-lms,wrdsb/canvas-lms,usmschuck/canvas,grahamb/canvas-lms,sfu/canvas-lms,narigone/canvas,instructure/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,Rvor/canvas-lms,sdeleon28/canvas-lms,eCNAP/CANVAS,samuels410/greatlakes-lms,leftplusrightllc/canvas-lms,venturehive/canvas-lms,skmezanul/canvas-lms,skmezanul/canvas-lms,wrdsb/canvas-lms,shidao-fm/canvas-lms,HotChalk/canvas-lms,instructure/canvas-lms,eCNAP/CANVAS,leftplusrightllc/canvas-lms,efrj/canvas-lms,leftplusrightllc/canvas-lms,SwinburneOnline/canvas-lms,matematikk-mooc/canvas-lms,sfu/canvas-lms,snehakachroo1/LSI_replica,antoniuslin/canvas-lms,juoni/canvas-lms,arrivu/arrivu-lms,va7map/canvas-lms,fronteerio/canvas-lms,Jyaasa/canvas-lms