migrate

Documentation

Index

• Variables
• type Schema
  • func NewSchema(drv dialect.Driver) *Schema
  • func (s *Schema) Create(ctx context.Context, opts ...schema.MigrateOption) error
  • func (s *Schema) WriteTo(ctx context.Context, w io.Writer, opts ...schema.MigrateOption) error

Variables

var (
	// WithGlobalUniqueID sets the universal ids options to the migration.
	// If this option is enabled, ent migration will allocate a 1<<32 range
	// for the ids of each entity (table).
	// Note that this option cannot be applied on tables that already exist.
	WithGlobalUniqueID = schema.WithGlobalUniqueID
	// WithDropColumn sets the drop column option to the migration.
	// If this option is enabled, ent migration will drop old columns
	// that were used for both fields and edges. This defaults to false.
	WithDropColumn = schema.WithDropColumn
	// WithDropIndex sets the drop index option to the migration.
	// If this option is enabled, ent migration will drop old indexes
	// that were defined in the schema. This defaults to false.
	// Note that unique constraints are defined using `UNIQUE INDEX`,
	// and therefore, it's recommended to enable this option to get more
	// flexibility in the schema changes.
	WithDropIndex = schema.WithDropIndex
	// WithFixture sets the foreign-key renaming option to the migration when upgrading
	// ent from v0.1.0 (issue-#285). Defaults to false.
	WithFixture = schema.WithFixture
	// WithForeignKeys enables creating foreign-key in schema DDL. This defaults to true.
	WithForeignKeys = schema.WithForeignKeys
)

var (
	// CarsColumns holds the columns for the "cars" table.
	CarsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "model", Type: field.TypeString},
		{Name: "registered_at", Type: field.TypeTime},
		{Name: "user_cars", Type: field.TypeInt, Nullable: true},
	}
	// CarsTable holds the schema information for the "cars" table.
	CarsTable = &schema.Table{
		Name:       "cars",
		Columns:    CarsColumns,
		PrimaryKey: []*schema.Column{CarsColumns[0]},
		ForeignKeys: []*schema.ForeignKey{
			{
				Symbol:  "cars_users_cars",
				Columns: []*schema.Column{CarsColumns[3]},

				RefColumns: []*schema.Column{UsersColumns[0]},
				OnDelete:   schema.SetNull,
			},
		},
	}
	// GroupsColumns holds the columns for the "groups" table.
	GroupsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "name", Type: field.TypeString},
	}
	// GroupsTable holds the schema information for the "groups" table.
	GroupsTable = &schema.Table{
		Name:        "groups",
		Columns:     GroupsColumns,
		PrimaryKey:  []*schema.Column{GroupsColumns[0]},
		ForeignKeys: []*schema.ForeignKey{},
	}
	// UsersColumns holds the columns for the "users" table.
	UsersColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "age", Type: field.TypeInt},
		{Name: "name", Type: field.TypeString, Default: "unknown"},
	}
	// UsersTable holds the schema information for the "users" table.
	UsersTable = &schema.Table{
		Name:        "users",
		Columns:     UsersColumns,
		PrimaryKey:  []*schema.Column{UsersColumns[0]},
		ForeignKeys: []*schema.ForeignKey{},
	}
	// GroupUsersColumns holds the columns for the "group_users" table.
	GroupUsersColumns = []*schema.Column{
		{Name: "group_id", Type: field.TypeInt},
		{Name: "user_id", Type: field.TypeInt},
	}
	// GroupUsersTable holds the schema information for the "group_users" table.
	GroupUsersTable = &schema.Table{
		Name:       "group_users",
		Columns:    GroupUsersColumns,
		PrimaryKey: []*schema.Column{GroupUsersColumns[0], GroupUsersColumns[1]},
		ForeignKeys: []*schema.ForeignKey{
			{
				Symbol:  "group_users_group_id",
				Columns: []*schema.Column{GroupUsersColumns[0]},

				RefColumns: []*schema.Column{GroupsColumns[0]},
				OnDelete:   schema.Cascade,
			},
			{
				Symbol:  "group_users_user_id",
				Columns: []*schema.Column{GroupUsersColumns[1]},

				RefColumns: []*schema.Column{UsersColumns[0]},
				OnDelete:   schema.Cascade,
			},
		},
	}
	// Tables holds all the tables in the schema.
	Tables = []*schema.Table{
		CarsTable,
		GroupsTable,
		UsersTable,
		GroupUsersTable,
	}
)

Types

type Schema

type Schema struct {
	// contains filtered or unexported fields
}

Schema is the API for creating, migrating and dropping a schema.

func NewSchema

func NewSchema(drv dialect.Driver) *Schema

NewSchema creates a new schema client.

func (*Schema) Create

func (s *Schema) Create(ctx context.Context, opts ...schema.MigrateOption) error

Create creates all schema resources.

func (*Schema) WriteTo

func (s *Schema) WriteTo(ctx context.Context, w io.Writer, opts ...schema.MigrateOption) error

WriteTo writes the schema changes to w instead of running them against the database.

if err := client.Schema.WriteTo(context.Background(), os.Stdout); err != nil {
	log.Fatal(err)
}