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Version: 0.7.0

Migrations API Reference

Reference for schema creation, schema sync, indexes, foreign keys, and versioned migrations.

Client Schema Helpers​

Migrate(ctx context.Context, models ...any) error​

Creates missing tables for the given models.

err := client.Migrate(ctx, &User{}, &Order{}, &Product{})

Migrate also creates many-to-many join tables for relations tagged rel:"many_to_many" with an m2m tag.

Sync(ctx context.Context, opts SyncOptions, models ...any) error​

Synchronizes existing tables with model metadata.

err := client.Sync(ctx, quark.SyncOptions{}, &User{})

Supported sync operations:

ChangeSupport
Missing tableCalls Migrate unless DryRun is true.
New columnAdds the column.
Renamed columnUses quark:"rename:old_col".
Removed columnDrops only when SafeMigrations is false.
type SyncOptions struct {
    DryRun        bool
    NoTransaction bool
}

CreateIndex(ctx, table, indexName string, columns []string, unique bool) error​

Creates a simple index.

err := client.CreateIndex(
    ctx,
    "users",
    "idx_users_email",
    []string{"email"},
    true,
)

AddForeignKey(ctx, table, constraintName string, columns []string, refTable string, refColumns []string, onDelete, onUpdate string) error​

Adds a foreign key constraint.

err := client.AddForeignKey(
    ctx,
    "orders",
    "fk_orders_user",
    []string{"user_id"},
    "users",
    []string{"id"},
    "CASCADE",
    "",
)

Versioned Migrations​

migrate.Register(m *Migration)​

Registers a migration in the global migration registry.

migrate.Register(&migrate.Migration{
    ID:   "202605050001_add_email_index",
    Name: "add email index",
    Up: func(ctx context.Context, client *quark.Client) error {
        return client.CreateIndex(ctx, "users", "idx_users_email", []string{"email"}, true)
    },
    Down: func(ctx context.Context, client *quark.Client) error {
        return client.Exec(ctx, "DROP INDEX idx_users_email")
    },
})

Migration IDs are sorted lexicographically. Use timestamp-like IDs.

type Migration struct {
    ID      string
    Name    string
    Message string
    Up      func(ctx context.Context, client *quark.Client) error
    Down    func(ctx context.Context, client *quark.Client) error
}

migrate.Reset()​

Clears the migration registry. Intended for tests.

Migrator​

migrate.NewMigrator(client *quark.Client) *Migrator​

Creates a migrator bound to a client.

migrator := migrate.NewMigrator(client)

The migrator stores applied migration IDs in quark_migrations.

Init(ctx context.Context) error​

Creates the migration tracking table if needed.

err := migrator.Init(ctx)

Up(ctx context.Context, steps int) error​

Applies pending migrations in ID order.

err := migrator.Up(ctx, 0) // apply all pending
err = migrator.Up(ctx, 2)  // apply at most two

UpDryRun(ctx context.Context, steps int) error​

Prints pending migrations without executing their Up functions.

err := migrator.UpDryRun(ctx, 0)

Down(ctx context.Context, steps int) error​

Reverts applied migrations in reverse ID order.

err := migrator.Down(ctx, 1)

Raw SQL Requirement​

migrate.Migrator uses client.Exec for its tracking table changes. Configure the migration client with AllowRawQueries: true:

limits := quark.DefaultLimits()
limits.AllowRawQueries = true

client, err := quark.New("postgres", dsn,
    quark.WithLimits(limits),
)

High-level helpers such as Migrate, Sync, CreateIndex, and AddForeignKey do not require AllowRawQueries.