migration

type AddColumn struct {
	Table  string
	Column Column
}

type AlterColumnType struct {
	Table  string
	Column string
	From   string
	// FromLength and ToLength are the varchar lengths of From and To, and 0
	// for any other type. They are additive: files written without them
	// mean what they always meant.
	FromLength int `json:",omitempty"`
	To         string
	ToLength   int `json:",omitempty"`
	Default    string
}

type AlterColumnUnique struct {
	Table  string
	Column string
	Unique bool
}

type Column struct {
	Name string
	Type string
	// Length is the maximum number of characters of a "varchar" column, and
	// 0 for every other type. It is an additive field: generated files
	// written before it existed leave it 0 and mean what they always meant.
	Length     int `json:",omitempty"`
	PrimaryKey bool
	Unique     bool
	Indexed    bool
	// References is the target table name for a foreign key column (from a
	// tango:"fk=X" tag), or "" for an ordinary column. The generated
	// constraint is always RESTRICT/NO ACTION: cascade delete is
	// implemented in application code by Store.Delete, never by the
	// database itself.
	References string
	// Default is a raw SQL literal (e.g. "TRUE") the column is given as a
	// NOT NULL DEFAULT when adding it to an existing table, so pre-existing
	// rows backfill to that value instead of NULL. Empty means no default:
	// the column is added exactly as before this field existed. There is no
	// struct-tag-driven way to set this — it is only ever hand-authored on a
	// specific generated migration where an existing model needs it.
	Default string
}

type ColumnState struct {
	Name       string
	Type       string
	Length     int
	PrimaryKey bool
	Unique     bool
	Indexed    bool
	References string
	// Default is the column's database default as a raw SQL literal, set
	// by an AddColumn that carried one and converted by AlterColumnType.
	// CreateTable never writes a default (see columnDefSQL), so replay
	// never takes one from it.
	Default string
}

type CreateIndex struct {
	Table  string
	Column string
}

type CreateTable struct {
	Table   string
	Columns []Column
}

type DropColumn struct {
	Table  string
	Column string
}

type DropIndex struct {
	Table  string
	Column string
}

type DropTable struct {
	Table string
}

type Migration struct {
	App        string
	Name       string
	Up         []Step
	Down       []Step
	Reversible bool
}

type MigrationKey struct {
	App  string
	Name string
}

type Model struct {
	App     string
	Name    string
	Columns []Column
	// Struct and Fields are the Go names behind Name and each column's
	// name (column name to Go field name), so makemigrations can name a
	// model or field the way the developer wrote it.
	Struct string
	Fields map[string]string
}

type Rename struct {
	App    string
	Table  string
	Column string
	To     string
}

type RenameColumn struct {
	Table string
	From  string
	To    string
}

type RenameTable struct {
	From string
	To   string
}

type SchemaState struct {
	Tables map[string]TableState
}

type Step interface {
	// contains filtered or unexported methods
}

type TableState struct {
	Name    string
	App     string
	Columns []ColumnState
}