NoMethodError: undefined method `indexes' for nil:NilClass

[fabiokr]

Hello, I'm getting that error when schema_validations run for a model. It is triggered when updating a record on a Sidekiq Worker. Restarting Sidekiq seems to fix it, but it will eventually happen again. Maybe a database connection reload issue?

• Rails 5.0.2
• Sidekiq 4.2.9
• schema_validations 2.2.1
• schema_plus_columns 0.1.3

Stack trace is below:

[GEM_ROOT]/gems/schema_plus_columns-0.1.3/lib/schema_plus/columns/active_record/connection_adapters/column.rb:16 :in `indexes`
 [GEM_ROOT]/gems/schema_plus_columns-0.1.3/lib/schema_plus/columns/active_record/connection_adapters/column.rb:31 :in `unique?`
 [GEM_ROOT]/gems/schema_validations-2.2.1/lib/schema_validations/active_record/validations.rb:166 :in `block in load_association_validations`
 [GEM_ROOT]/gems/schema_validations-2.2.1/lib/schema_validations/active_record/validations.rb:156 :in `each`
 [GEM_ROOT]/gems/schema_validations-2.2.1/lib/schema_validations/active_record/validations.rb:156 :in `load_association_validations`
 [GEM_ROOT]/gems/schema_validations-2.2.1/lib/schema_validations/active_record/validations.rb:89 :in `load_schema_validations`
 [GEM_ROOT]/gems/schema_validations-2.2.1/lib/schema_validations/active_record/validations.rb:6 :in `load_schema_validations`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:382 :in `block in make_lambda`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:169 :in `block (2 levels) in halting`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:770 :in `block (2 levels) in deprecated_false_terminator`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:769 :in `catch`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:769 :in `block in deprecated_false_terminator`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:170 :in `block in halting`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:454 :in `block in call`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:454 :in `each`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:454 :in `call`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:448 :in `block (2 levels) in around`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:286 :in `block (2 levels) in halting`
 [GEM_ROOT]/gems/state_machines-activemodel-0.4.0/lib/state_machines/integrations/active_model.rb:400 :in `block in around_validation`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:150 :in `block in run_actions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:170 :in `catch_exceptions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:148 :in `run_actions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:133 :in `run_callbacks`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:212 :in `run_callbacks`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `block (2 levels) in perform`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `catch`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `block in perform`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:186 :in `within_transaction`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:62 :in `perform`
 [GEM_ROOT]/gems/state_machines-activemodel-0.4.0/lib/state_machines/integrations/active_model.rb:400 :in `around_validation`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:405 :in `public_send`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:405 :in `block in make_lambda`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:285 :in `block in halting`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:447 :in `block in around`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:455 :in `call`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:101 :in `__run_callbacks__`
 [GEM_ROOT]/gems/activesupport-5.0.2/lib/active_support/callbacks.rb:750 :in `_run_validation_callbacks`
 [GEM_ROOT]/gems/activemodel-5.0.2/lib/active_model/validations/callbacks.rb:113 :in `run_validations!`
 [GEM_ROOT]/gems/activemodel-5.0.2/lib/active_model/validations.rb:338 :in `valid?`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/validations.rb:65 :in `valid?`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/validations.rb:82 :in `perform_validations`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/validations.rb:50 :in `save!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/attribute_methods/dirty.rb:30 :in `save!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:324 :in `block in save!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:395 :in `block in with_transaction_returning_status`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:230 :in `transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:211 :in `transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:392 :in `with_transaction_returning_status`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:324 :in `save!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/suppressor.rb:45 :in `save!`
 [GEM_ROOT]/gems/state_machines-activerecord-0.4.0/lib/state_machines/integrations/active_record.rb:505 :in `block in save!`
 [GEM_ROOT]/gems/state_machines-activerecord-0.4.0/lib/state_machines/integrations/active_record.rb:520 :in `block in around_save`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:150 :in `block in run_actions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:170 :in `catch_exceptions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:148 :in `run_actions`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:133 :in `run_callbacks`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:212 :in `run_callbacks`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `block (2 levels) in perform`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `catch`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:63 :in `block in perform`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:186 :in `within_transaction`
 [GEM_ROOT]/gems/state_machines-0.4.0/lib/state_machines/transition_collection.rb:62 :in `perform`
 [GEM_ROOT]/gems/state_machines-activerecord-0.4.0/lib/state_machines/integrations/active_record.rb:520 :in `around_save`
 [GEM_ROOT]/gems/state_machines-activerecord-0.4.0/lib/state_machines/integrations/active_record.rb:505 :in `save!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/persistence.rb:280 :in `block in update!`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:395 :in `block in with_transaction_returning_status`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:232 :in `block in transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/transaction.rb:189 :in `within_new_transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/connection_adapters/abstract/database_statements.rb:232 :in `transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:211 :in `transaction`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/transactions.rb:392 :in `with_transaction_returning_status`
 [GEM_ROOT]/gems/activerecord-5.0.2/lib/active_record/persistence.rb:278 :in `update!`