initial commit

migrations/00019_split_full_name.sql

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+-- +goose Up
+-- +goose StatementBegin
+
+-- =========================================
+-- Разделение full_name на first_name и last_name
+-- =========================================
+
+-- Добавляем новые колонки
+ALTER TABLE users
+    ADD COLUMN first_name VARCHAR(100),
+    ADD COLUMN last_name VARCHAR(100);
+
+-- Копируем данные из full_name в новые поля
+-- Разделяем по первому пробелу
+UPDATE users
+SET
+    first_name = CASE
+        WHEN position(' ' in full_name) > 0
+        THEN split_part(full_name, ' ', 1)
+        ELSE full_name
+    END,
+    last_name = CASE
+        WHEN position(' ' in full_name) > 0
+        THEN substring(full_name from position(' ' in full_name) + 1)
+        ELSE ''
+    END
+WHERE full_name IS NOT NULL;
+
+-- Делаем новые поля обязательными
+ALTER TABLE users
+    ALTER COLUMN first_name SET NOT NULL,
+    ALTER COLUMN last_name SET NOT NULL;
+
+-- Удаляем старую колонку
+ALTER TABLE users DROP COLUMN full_name;
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+
+-- Восстанавливаем full_name
+ALTER TABLE users ADD COLUMN full_name VARCHAR(255);
+
+-- Объединяем имя и фамилию обратно
+UPDATE users
+SET full_name = first_name || ' ' || last_name
+WHERE first_name IS NOT NULL AND last_name IS NOT NULL;
+
+-- Делаем full_name обязательным
+ALTER TABLE users ALTER COLUMN full_name SET NOT NULL;
+
+-- Удаляем новые колонки
+ALTER TABLE users
+    DROP COLUMN first_name,
+    DROP COLUMN last_name;
+
+-- +goose StatementEnd