framework
Rails Errors
Rails errors: ActiveRecord::RecordNotFound, ActiveRecord::RecordInvalid, RoutingError, ActionController::ParameterMissing, NoMethodError on nil, PG::ConnectionBad, deadlock detected.
Rails errors mostly come from ActiveRecord (RecordNotFound, RecordInvalid, deadlocks) and routing (RoutingError, AbstractController::ActionNotFound). Strong parameters raise ParameterMissing. Asset compilation errors block deploys. N+1 queries are flagged by `bullet` gem. PG::ConnectionBad usually means too many app instances vs Postgres `max_connections`.
Official docs
https://api.rubyonrails.org/classes/ActiveRecord.html
Support
https://rubyonrails.org/community/