# dm-migrations

**Repository Path**: mirrors_Asana/dm-migrations

## Basic Information

- **Project Name**: dm-migrations
- **Description**: DataMapper plugin for writing and speccing migrations
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-04-14
- **Last Updated**: 2025-12-27

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

= dm-migrations

DataMapper plugin for writing and specing migrations.

== Example

  require 'dm-migrations/migration_runner'

  DataMapper.setup(:default, "sqlite3::memory")

  DataMapper::Logger.new(STDOUT, :debug)
  DataMapper.logger.debug( "Starting Migration" )

  migration 1, :create_people_table do
    up do
      create_table :people do
        column :id,   Integer, :serial => true
        column :desc, String
      end
    end

    down do
      drop_table :people
    end
  end

  migration 2, :make_desc_text do
    up do
      modify_table :people do
        # You currently have to use the underlying DB type here, rather than
        # a DataMapper type
        change_column :desc, 'text'
      end
    end
  end

  migrate_up!

For more, see the examples directory.