Feature: migrations

[caspiano]

class Model < RethinkORM::Base
  include RethinkORM::Migration

  attribute name : String
  attribute age : Int32


  migration("0.1", "1") do |data, model|
      model.age = data["current_age"].as_i
      model
  end
end

the RethinkORM::Migration module exposes a macro migration(from : String, to : String, & : (JSON::Any, {{type}}) -> {{type}})

The version is extracted from the current package's version, and necessary migrations are run sequentially up to the current version.

[stakach]

going to dump a bunch of migrations in here:

Renaming a column, reference: http://redlua.com/post/rename-a-field-in-rethinkdb/

r.db('place_development').table('metadata').replace(function(meta) {
  return meta.without('zone_id').merge({'parent_id': meta('zone_id')});
});