Optimize .mark_as_read! and extend to work on relations #1
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by fatkodima
This PR optimizes .mark_as_read! to be roughly one query for collections and for relations.
Implements
Partly done by ledermann#93 - an optimized "one query" solution for scopes is still pending.
from ledermann#73 and fixes ledermann#80.
This is a an improvement over my previous PR ledermann#94, so probably that can be closed.
Implementation is based on INSERT ... ON CONFLICT DO ... like feature on modern databases (aka UPSERT) using gem upsert which uses native support of "upsert" or emulates if db does not provide it and allows to insert many records at once without db constraint violation.
PostgresSQL requires to have a unique constraint (just index is not sufficient) as so upsert gem, as stated on gem's readme so migration to add such was created.