Constructive operations

They are the operations that create, alter, or drop tables, columns, indexes, constraints, and so on.

• CreateTable(tableName schema.TableName, f func(*PostgresTableDef), opts ...schema.TableOptions)

• AddColumn(tableName schema.TableName, columnName string, columnType schema.ColumnType, opts ...schema.ColumnOptions)

• AddTimestamps(tableName schema.TableName

• AddColumnComment(tableName schema.TableName, columnName string, comment *string, opts ...schema.ColumnCommentOptions)

• AddTableComment(tableName schema.TableName, comment *string, opts ...schema.TableCommentOptions)

• AddCheckConstraint(tableName schema.TableName, constraintName string, expression string, opts ...schema.CheckConstraintOptions)

• AddExtension(name string, option ...schema.ExtensionOptions)

• AddForeignKey(fromTable, toTable schema.TableName, opts ...schema.AddForeignKeyConstraintOptions)

• AddIndex(table schema.TableName, columns []string, option ...schema.IndexOptions)

• AddPrimaryKeyConstraint(tableName schema.TableName, columns []string, opts ...schema.PrimaryKeyConstraintOptions)

• AddVersion(version string)

• CreateEnum(name string, values []string, opts ...schema.CreateEnumOptions)

• AddEnumValue(name string, value string, opts ...schema.AddEnumValueOptions)

Each of this functions are reversible, it means that in a migration that implement the change function, when you rollback the migration you don't have to write manually the rollback operation, the library will do it for you.