mysql - Model.association is returning nil, even with a valid id -

mysql - Model.association is returning nil, even with a valid id -

i have 2 models, webcast, , session. webcast belongs session, , session has 1 webcast. also, i'm using sti session, inherits model schedulable, , has type = 'session'.

i have session record, lets phone call session, , webcast record, we'll phone call webcast.

webcast.session_id equal session.id, , vice versa

yet, when query association, webcast.session nil. however, session.webcast returns webcast record.

also, have tried querying webcast.session on past webcast record , loads associated record fine.

any ideas happening here? in advance.

update:

queries:

(session.webcast)

webcast load (1.0ms) select `webcasts`.* `webcasts` `webcasts`.`session_id` = 2679 limit 1

(webcast.session)

session load (0.3ms) select `schedulables`.* `schedulables` `schedulables`.`import_id` null , `schedulables`.`type` in ('session') , `schedulables`.`id` = 2679 order `schedulables`.`starts_at` asc limit 1

also, noticed if load specific session record webcast belongs too, reload webcast record , seek webcast.session 1 time again homecoming session record rather nil.

mysql ruby-on-rails activerecord ruby-on-rails-4 single-table-inheritance