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Code Issues Projects Releases Wiki Activity

Make the sample migration not destroy data (#962)

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Gwynne Raskind 2024-02-06 18:03:25 -06:00 committed by GitHub
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docs/fluent/schema.md
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@ -380,15 +380,34 @@ We can make the necessary database schema adjustments with the following migrati
```swift
struct UserNameMigration: AsyncMigration {
func prepare(on database: Database) async throws {
try await database.schema("users")
.field("first_name", .string, .required)
.field("last_name", .string, .required)
.update()
// It is not currently possible to express this update without using custom SQL.
// This also doesn't try to deal with splitting the name into first and last,
// as that requires database-specific syntax.
try await User.query(on: database)
.set(["first_name": .sql(embed: "name"))
.run()
try await database.schema("users")
.deleteField("name")
.field("first_name", .string)
.field("last_name", .string)
.update()
}
func revert(on database: Database) async throws {
try await database.schema("users").delete()
try await database.schema("users")
.field("name", .string, .required)
.update()
try await User.query(on: database)
.set(["name": .sql(embed: "concat(first_name, ' ', last_name)"))
.run()
try await database.schema("users")
.deleteField("first_name")
.deleteField("last_name")
.update()
}
}
```