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
)

var (
	// BlobsColumns holds the columns for the "blobs" table.
	BlobsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeUUID},
		{Name: "uuid", Type: field.TypeUUID, Default: blob.DefaultUUID},
	}
	// BlobsTable holds the schema information for the "blobs" table.
	BlobsTable = &schema.Table{
		Name:        "blobs",
		Columns:     BlobsColumns,
		PrimaryKey:  []*schema.Column{BlobsColumns[0]},
		ForeignKeys: []*schema.ForeignKey{},
	}
	// GroupsColumns holds the columns for the "groups" table.
	GroupsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
	}
	// GroupsTable holds the schema information for the "groups" table.
	GroupsTable = &schema.Table{
		Name:        "groups",
		Columns:     GroupsColumns,
		PrimaryKey:  []*schema.Column{GroupsColumns[0]},
		ForeignKeys: []*schema.ForeignKey{},
	}
	// PetsColumns holds the columns for the "pets" table.
	PetsColumns = []*schema.Column{
		{Name: "id", Type: field.TypeString, Unique: true, Size: 25},
		{Name: "user_pets", Type: field.TypeInt, Nullable: true},
	}
	// PetsTable holds the schema information for the "pets" table.
	PetsTable = &schema.Table{
		Name:       "pets",
		Columns:    PetsColumns,
		PrimaryKey: []*schema.Column{PetsColumns[0]},
		ForeignKeys: []*schema.ForeignKey{
			{
				Symbol:  "pets_users_pets",
				Columns: []*schema.Column{PetsColumns[1]},

				RefColumns: []*schema.Column{UsersColumns[0]},
				OnDelete:   schema.SetNull,
			},
		},
	}
	// UsersColumns holds the columns for the "users" table.
	UsersColumns = []*schema.Column{
		{Name: "id", Type: field.TypeInt, Increment: true},
		{Name: "user_children", Type: field.TypeInt, Nullable: true},
	}
	// UsersTable holds the schema information for the "users" table.
	UsersTable = &schema.Table{
		Name:       "users",
		Columns:    UsersColumns,
		PrimaryKey: []*schema.Column{UsersColumns[0]},
		ForeignKeys: []*schema.ForeignKey{
			{
				Symbol:  "users_users_children",
				Columns: []*schema.Column{UsersColumns[1]},

				RefColumns: []*schema.Column{UsersColumns[0]},
				OnDelete:   schema.SetNull,
			},
		},
	}
	// 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{
		BlobsTable,
		GroupsTable,
		PetsTable,
		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)
}