fix finding shadow objects through has_through association

Change-Id: I2fd962376d3c21523b2448371b2c0ae89d3c8074
Reviewed-on: https://gerrit.instructure.com/42429
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>
bump version to 1.2.20

Change-Id: I57f311b369b222d185af096a4352fd2ec2eeee1d
Reviewed-on: https://gerrit.instructure.com/42587
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>
QA-Review: Simon Williams <simon@instructure.com>
fix preloading across the correct shards

fixes CNVS-16392

Change-Id: Ic736eb5e759aeb5de949df88cf229367751ef2e3
Reviewed-on: https://gerrit.instructure.com/43157
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Paul Hinze <paulh@instructure.com>
QA-Review: August Thornton <august@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
bump version

Change-Id: Ica070fe21565b8bbcdc11cb58f634e3fd00eb2c6