Ilya Lavrov questions

Ilya Lavrov answers

• RSpec how to test an argument data type passed to a method
• Multicolumn index with expression (PostgreSQL and Rails)
• form_with search field in Rails 5.1
• Conditionally eager loading polymorphic associations
• Arel: active relation from Arel::SelectManager with join
• PG::InvalidColumnReference: ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list
• Rails where has_many not empty
• Rails db:structure:dump has incorrect search paths
• Active Record scope chaining, ignore joins, if already joined
• How to avoid n+1 queries when using polymorphic associations?