Rails 7 adds ActiveRecord::FinderMethods#sole
By Abhishek Kanojia on August 30, 2021
Rails 7 adds method sole and find_sole_by in ActiveRecord::FinderMethods, which enables you to get sole or single record by the attributes defined, and also asserts that there aren’t multiple rows matching the condition.
Example usage of sole
Product.where(name: 'Test').sole
# => ActiveRecord::RecordNotFound ( If no record is found )
# => #<Product ..> ( If single record is found )
# => ActiveRecord::SoleRecordExceeded ( If more records are found with given name )
Example usage of find_sole_by
Product.find_sole_by(name: 'Test')
# => ActiveRecord::RecordNotFound ( If no record is found )
# => #<Product ..> ( If single record is found )
# => ActiveRecord::SoleRecordExceeded ( If more records are found with given name )