Adds support for threaded discussions. The existing API has been updated
to allow posting replies to replies, and returns the whole thread of
sub-replies rather than just first-level side comments. For backwards
compatbility, the sub-replies are returned in a flattened newest-first,
consumers can look at the parent id of each entry to re-build the
nested, threaded structure.
Another commit will add a new API endpoint for retriving the threaded
structure of the conversation in a more efficient and natural format.
test plan: there's no UI for threaded discussions yet, but you can use
the API to post replies to replies, and retrieve threads and verify the
parent_id information.
Change-Id: I7d541d093fbbdb6fc8a18d079b4337515c02a8a4
Reviewed-on: https://gerrit.instructure.com/9121
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
Cody Cutrer