feat: migrator support to change table column

contracts/database/schema/column.go

@@ -3,6 +3,8 @@ package schema
 type ColumnDefinition interface {
 	// AutoIncrement set the column as auto increment
 	AutoIncrement() ColumnDefinition
+	// Change the column
+	Change() ColumnDefinition
 	// Comment sets the comment value
 	Comment(comment string) ColumnDefinition
 	// Default set the default value
@@ -37,6 +39,8 @@ type ColumnDefinition interface {
 	GetUseCurrent() bool
 	// GetUseCurrentOnUpdate returns the useCurrentOnUpdate value
 	GetUseCurrentOnUpdate() bool
+	// IsChange returns true if the column has changed
+	IsChange() bool
 	// IsSetComment returns true if the comment value is set
 	IsSetComment() bool
 	// OnUpdate sets the column to use the value on update (Mysql only)

contracts/database/schema/grammar.go

@@ -3,12 +3,16 @@ package schema
 type Grammar interface {
 	// CompileAdd Compile an add column command.
 	CompileAdd(blueprint Blueprint, command *Command) string
+	// CompileChange Compile a change column command.
+	CompileChange(blueprint Blueprint, command *Command) []string
 	// CompileColumns Compile the query to determine the columns.
 	CompileColumns(schema, table string) string
 	// CompileComment Compile a column comment command.
 	CompileComment(blueprint Blueprint, command *Command) string
 	// CompileCreate Compile a create table command.
 	CompileCreate(blueprint Blueprint) string
+	// CompileDefault Compile a default value command.
+	CompileDefault(blueprint Blueprint, command *Command) string
 	// CompileDrop Compile a drop table command.
 	CompileDrop(blueprint Blueprint) string
 	// CompileDropAllDomains Compile the SQL needed to drop all domains.

database/schema/blueprint.go

@@ -430,13 +430,23 @@ func (r *Blueprint) ToSql(grammar schema.Grammar) []string {
 
 		switch command.Name {
 		case constants.CommandAdd:
+			if command.Column.IsChange() {
+				if statement := grammar.CompileChange(r, command); len(statement) > 0 {
+					statements = append(statements, statement...)
+				}
+				continue
+			}
 			statements = append(statements, grammar.CompileAdd(r, command))
 		case constants.CommandComment:
 			if statement := grammar.CompileComment(r, command); statement != "" {
 				statements = append(statements, statement)
 			}
 		case constants.CommandCreate:
 			statements = append(statements, grammar.CompileCreate(r))
+		case constants.CommandDefault:
+			if statement := grammar.CompileDefault(r, command); statement != "" {
+				statements = append(statements, statement)
+			}
 		case constants.CommandDrop:
 			statements = append(statements, grammar.CompileDrop(r))
 		case constants.CommandDropColumn:
@@ -503,12 +513,18 @@ func (r *Blueprint) addAttributeCommands(grammar schema.Grammar) {
 	attributeCommands := grammar.GetAttributeCommands()
 	for _, column := range r.columns {
 		for _, command := range attributeCommands {
-			if command == constants.CommandComment && column.comment != nil {
+			if command == constants.CommandComment && (column.comment != nil || column.change) {
 				r.addCommand(&schema.Command{
 					Column: column,
 					Name:   constants.CommandComment,
 				})
 			}
+			if command == constants.CommandDefault && column.def != nil {
+				r.addCommand(&schema.Command{
+					Column: column,
+					Name:   constants.CommandDefault,
+				})
+			}
 		}
 	}
 }

database/schema/blueprint_test.go

@@ -386,6 +386,15 @@ func (s *BlueprintTestSuite) TestToSql() {
 		} else {
 			s.Empty(s.blueprint.ToSql(grammar))
 		}
+
+		// Change column
+		s.SetupTest()
+		s.blueprint.String("name", 100).Change()
+		if driver == database.DriverPostgres {
+			s.Len(s.blueprint.ToSql(grammar), 2)
+		} else {
+			s.Empty(s.blueprint.ToSql(grammar))
+		}
 	}
 }
 
@@ -438,3 +447,15 @@ func (s *BlueprintTestSuite) TestUnsignedTinyInteger() {
 		unsigned: convert.Pointer(true),
 	})
 }
+
+func (s *BlueprintTestSuite) TestChange() {
+	column := "name"
+	customLength := 100
+	s.blueprint.String(column, customLength).Change()
+	s.Contains(s.blueprint.GetAddedColumns(), &ColumnDefinition{
+		length: &customLength,
+		name:   &column,
+		change: true,
+		ttype:  convert.Pointer("string"),
+	})
+}

database/schema/column.go

@@ -8,6 +8,7 @@ import (
 type ColumnDefinition struct {
 	allowed            []any
 	autoIncrement      *bool
+	change             bool
 	comment            *string
 	def                any
 	length             *int
@@ -29,6 +30,12 @@ func (r *ColumnDefinition) AutoIncrement() schema.ColumnDefinition {
 	return r
 }
 
+func (r *ColumnDefinition) Change() schema.ColumnDefinition {
+	r.change = true
+
+	return r
+}
+
 func (r *ColumnDefinition) Comment(comment string) schema.ColumnDefinition {
 	r.comment = &comment
 
@@ -149,6 +156,10 @@ func (r *ColumnDefinition) GetUseCurrentOnUpdate() bool {
 	return false
 }
 
+func (r *ColumnDefinition) IsChange() bool {
+	return r.change
+}
+
 func (r *ColumnDefinition) IsSetComment() bool {
 	return r != nil && r.comment != nil
 }

database/schema/column_test.go

@@ -63,6 +63,13 @@ func (s *ColumnDefinitionTestSuite) GetType() {
 	s.Equal("string", s.columnDefinition.GetType())
 }
 
+func (s *ColumnDefinitionTestSuite) IsChange() {
+	s.False(s.columnDefinition.IsChange())
+
+	s.columnDefinition.Change()
+	s.True(s.columnDefinition.IsChange())
+}
+
 func (s *ColumnDefinitionTestSuite) Unsigned() {
 	s.columnDefinition.Unsigned()
 	s.True(*s.columnDefinition.unsigned)

database/schema/constants/constants.go

@@ -4,6 +4,7 @@ const (
 	CommandAdd          = "add"
 	CommandComment      = "comment"
 	CommandCreate       = "create"
+	CommandDefault      = "default"
 	CommandDrop         = "drop"
 	CommandDropColumn   = "dropColumn"
 	CommandDropForeign  = "dropForeign"

database/schema/grammars/mysql.go

@@ -41,6 +41,12 @@ func (r *Mysql) CompileAdd(blueprint schema.Blueprint, command *schema.Command)
 	return fmt.Sprintf("alter table %s add %s", r.wrap.Table(blueprint.GetTableName()), r.getColumn(blueprint, command.Column))
 }
 
+func (r *Mysql) CompileChange(blueprint schema.Blueprint, command *schema.Command) []string {
+	return []string{
+		fmt.Sprintf("alter table %s modify %s", r.wrap.Table(blueprint.GetTableName()), r.getColumn(blueprint, command.Column)),
+	}
+}
+
 func (r *Mysql) CompileColumns(schema, table string) string {
 	return fmt.Sprintf(
 		"select column_name as `name`, data_type as `type_name`, column_type as `type`, "+
@@ -71,6 +77,10 @@ func (r *Mysql) CompileCreate(blueprint schema.Blueprint) string {
 	return fmt.Sprintf("create table %s (%s)", r.wrap.Table(blueprint.GetTableName()), strings.Join(columns, ", "))
 }
 
+func (r *Mysql) CompileDefault(_ schema.Blueprint, _ *schema.Command) string {
+	return ""
+}
+
 func (r *Mysql) CompileDisableForeignKeyConstraints() string {
 	return "SET FOREIGN_KEY_CHECKS=0;"
 }

database/schema/grammars/mysql_test.go

@@ -43,6 +43,27 @@ func (s *MysqlSuite) TestCompileAdd() {
 	s.Equal("alter table `goravel_users` add `name` varchar(1) not null default 'goravel' comment 'comment'", sql)
 }
 
+func (s *MysqlSuite) TestCompileChange() {
+	mockBlueprint := mocksschema.NewBlueprint(s.T())
+	mockColumn := mocksschema.NewColumnDefinition(s.T())
+
+	mockBlueprint.EXPECT().GetTableName().Return("users").Once()
+	mockColumn.EXPECT().GetName().Return("name").Once()
+	mockColumn.EXPECT().GetType().Return("string").Twice()
+	mockColumn.EXPECT().GetDefault().Return("goravel").Twice()
+	mockColumn.EXPECT().GetNullable().Return(false).Once()
+	mockColumn.EXPECT().GetLength().Return(1).Once()
+	mockColumn.EXPECT().GetOnUpdate().Return(nil).Once()
+	mockColumn.EXPECT().GetComment().Return("comment").Once()
+	mockColumn.EXPECT().GetUnsigned().Return(false).Once()
+
+	sql := s.grammar.CompileChange(mockBlueprint, &contractsschema.Command{
+		Column: mockColumn,
+	})
+
+	s.Equal([]string{"alter table `goravel_users` modify `name` varchar(1) not null default 'goravel' comment 'comment'"}, sql)
+}
+
 func (s *MysqlSuite) TestCompileCreate() {
 	mockColumn1 := mocksschema.NewColumnDefinition(s.T())
 	mockColumn2 := mocksschema.NewColumnDefinition(s.T())

database/schema/grammars/postgres.go

@@ -39,6 +39,19 @@ func (r *Postgres) CompileAdd(blueprint schema.Blueprint, command *schema.Comman
 	return fmt.Sprintf("alter table %s add column %s", r.wrap.Table(blueprint.GetTableName()), r.getColumn(blueprint, command.Column))
 }
 
+func (r *Postgres) CompileChange(blueprint schema.Blueprint, command *schema.Command) []string {
+	changes := []string{fmt.Sprintf("alter column %s type %s", r.wrap.Column(command.Column.GetName()), getType(r, command.Column))}
+	for _, modifier := range r.modifiers {
+		if change := modifier(blueprint, command.Column); change != "" {
+			changes = append(changes, fmt.Sprintf("alter column %s%s", r.wrap.Column(command.Column.GetName()), change))
+		}
+	}
+
+	return []string{
+		fmt.Sprintf("alter table %s %s", r.wrap.Table(blueprint.GetTableName()), strings.Join(changes, ", ")),
+	}
+}
+
 func (r *Postgres) CompileColumns(schema, table string) string {
 	return fmt.Sprintf(
 		"select a.attname as name, t.typname as type_name, format_type(a.atttypid, a.atttypmod) as type, "+
@@ -67,6 +80,10 @@ func (r *Postgres) CompileCreate(blueprint schema.Blueprint) string {
 	return fmt.Sprintf("create table %s (%s)", r.wrap.Table(blueprint.GetTableName()), strings.Join(r.getColumns(blueprint), ", "))
 }
 
+func (r *Postgres) CompileDefault(_ schema.Blueprint, _ *schema.Command) string {
+	return ""
+}
+
 func (r *Postgres) CompileDrop(blueprint schema.Blueprint) string {
 	return fmt.Sprintf("drop table %s", r.wrap.Table(blueprint.GetTableName()))
 }
@@ -291,6 +308,15 @@ func (r *Postgres) GetAttributeCommands() []string {
 }
 
 func (r *Postgres) ModifyDefault(blueprint schema.Blueprint, column schema.ColumnDefinition) string {
+	if column.IsChange() {
+		if column.GetAutoIncrement() {
+			return ""
+		}
+		if column.GetDefault() != nil {
+			return fmt.Sprintf(" set default %s", getDefaultValue(column.GetDefault()))
+		}
+		return " drop default"
+	}
 	if column.GetDefault() != nil {
 		return fmt.Sprintf(" default %s", getDefaultValue(column.GetDefault()))
 	}
@@ -299,15 +325,20 @@ func (r *Postgres) ModifyDefault(blueprint schema.Blueprint, column schema.Colum
 }
 
 func (r *Postgres) ModifyNullable(blueprint schema.Blueprint, column schema.ColumnDefinition) string {
+	if column.IsChange() {
+		if column.GetNullable() {
+			return " drop not null"
+		}
+		return " set not null"
+	}
 	if column.GetNullable() {
 		return " null"
-	} else {
-		return " not null"
 	}
+	return " not null"
 }
 
 func (r *Postgres) ModifyIncrement(blueprint schema.Blueprint, column schema.ColumnDefinition) string {
-	if !blueprint.HasCommand("primary") && slices.Contains(r.serials, column.GetType()) && column.GetAutoIncrement() {
+	if !column.IsChange() && !blueprint.HasCommand("primary") && slices.Contains(r.serials, column.GetType()) && column.GetAutoIncrement() {
 		return " primary key"
 	}