Add #create_or_find_by to lean on unique constraints by dhh · Pull Request #31989 · rails/rails

Attempts to create a record with the given attributes in a table that has a unique constraint on one or several of its columns. If a row already exists with one or several of these unique constraints, the exception such an insertion would normally raise is caught, and the existing record with those attributes is sought found using #find_by. This is similar to #find_or_create_by, but avoids the pro

[morygonzalez]

先に INSERT を試みて失敗したら SELECT するのか。高スループットな環境で必要な機能。