fizz

README

Fizz

A Common DSL for Migrating Databases

Create a Table

create_table("users", func(t) {
  t.Column("email", "string", {})
  t.Column("twitter_handle", "string", {"size": 50})
  t.Column("age", "integer", {"default": 0})
  t.Column("admin", "boolean", {"default": false})
  t.Column("company_id", "uuid", {"default_raw": "uuid_generate_v1()"})
  t.Column("bio", "text", {"null": true})
  t.Column("joined_at", "timestamp", {})
})

The create_table function will also generate an id column of type integer that will auto-increment. It will also generate two timestamp columns; created_at and updated_at.

Columns all have the same syntax. First is the name of the column. Second is the type of the field. Third is any options you want to set on that column.

"Common" Types:

• string
• text
• timestamp, time, datetime
• integer
• boolean

Any other type passed it will be be passed straight through to the underlying database. For example for PostgreSQL you could pass jsonband it will be supported, however, SQLite will yell very loudly at you if you do the same thing!

Supported Options:

• size - The size of the column. For example if you wanted a varchar(50) in Postgres you would do: t.Column("column_name", "string", {"size": 50})
• null - By default columns are not allowed to be null.
• default - The default value you want for this column. By default this is null.
• default_raw - The default value defined as a database function.

Drop a Table

drop_table("table_name")

Rename a Table

rename_table("old_table_name", "new_table_name")

Add a Column

add_column("table_name", "column_name", "string", {})

See above for more details on column types and options.

Alter a column

change_column("table_name", "column_name", "string", {})

Rename a Column

rename_column("table_name", "old_column_name", "new_column_name")

Drop a Column

drop_column("table_name", "column_name")

Add an Index

Supported Options:

• name - This defaults to table_name_column_name_idx
• unique

Simple Index:

add_index("table_name", "column_name", {})

Multi-Column Index:

add_index("table_name", ["column_1", "column_2"], {})

Unique Index:

add_index("table_name", "column_name", {"unique": true})

Index Names:

add_index("table_name", "column_name", {}) # name => table_name_column_name_idx
add_index("table_name", "column_name", {"name": "custom_index_name"})

Rename an Index

rename_index("table_name", "old_index_name", "new_index_name")

Drop an Index

drop_index("table_name", "index_name")

Raw SQL

raw("select * from users;")

All calls to raw must end with a ;!

Execute an External Command

Sometimes during a migration you need to shell out to an external command.

exec("echo hello")

Documentation

Index

• Variables
• func AFile(f *os.File, t Translator) (string, error)
• func AString(s string, t Translator) (string, error)
• type BubbleType
• type Bubbler
  • func NewBubbler(t Translator) *Bubbler
  • func (b *Bubbler) Bubble(s string) (string, error)
  • func (b *Bubbler) String() string
• type Column
• type Index
• type Options
• type Table
  • func (t *Table) Column(name string, colType string, options map[string]interface{})
  • func (t *Table) ColumnNames() []string
  • func (t *Table) HasColumns(args ...string) bool
• type Translator

Variables

var CREATED_COL = Column{Name: "created_at", ColType: "timestamp", Options: Options{}}

var INT_ID_COL = Column{
	Name:    "id",
	Primary: true,
	ColType: "integer",
	Options: Options{},
}

var UPDATED_COL = Column{Name: "updated_at", ColType: "timestamp", Options: Options{}}

var UUID_ID_COL = Column{
	Name:    "id",
	Primary: true,
	ColType: "uuid",
	Options: Options{},
}

Functions

func AFile

func AFile(f *os.File, t Translator) (string, error)

func AString

func AString(s string, t Translator) (string, error)

Types

type BubbleType

type BubbleType int

type Bubbler

type Bubbler struct {
	Translator
	// contains filtered or unexported fields
}

func NewBubbler

func NewBubbler(t Translator) *Bubbler

func (*Bubbler) Bubble

func (b *Bubbler) Bubble(s string) (string, error)

func (*Bubbler) String

func (b *Bubbler) String() string

type Column

type Column struct {
	Name    string
	ColType string
	Primary bool
	Options map[string]interface{}
}

type Index

type Index struct {
	Name    string
	Columns []string
	Unique  bool
	Options Options
}

type Options

type Options map[string]interface{}

type Table

type Table struct {
	Name    string `db:"name"`
	Columns []Column
	Indexes []Index
}

func (*Table) Column

func (t *Table) Column(name string, colType string, options map[string]interface{})

func (*Table) ColumnNames

func (t *Table) ColumnNames() []string

func (*Table) HasColumns

func (t *Table) HasColumns(args ...string) bool

type Translator

type Translator interface {
	CreateTable(Table) (string, error)
	DropTable(Table) (string, error)
	RenameTable([]Table) (string, error)
	AddColumn(Table) (string, error)
	ChangeColumn(Table) (string, error)
	DropColumn(Table) (string, error)
	RenameColumn(Table) (string, error)
	AddIndex(Table) (string, error)
	DropIndex(Table) (string, error)
	RenameIndex(Table) (string, error)
}