Question

I am having basic rails issue during migrations. Here are the two scripts

class CreateGoogleMaps < ActiveRecord::Migration
  def self.up
    create_table :google_maps do |t|
      t.string :name, :null => false
      t.string :description
      t.column "center", :point, :null => false, :srid => 4326, :with_z => false # 4326: WSG84
      t.integer :zoom
      t.datetime :created_at
      t.datetime :updated_at
      t.integer :created_by_id
      t.integer :updated_by_id
    end
  end

  def self.down
    drop_table :google_maps
  end
end

File #2
+++ 003_add_map_style.rb ++++++

class AddMapStyle < ActiveRecord::Migration
  def self.up
      add_column :google_maps, :style, :integer
      GoogleMaps.update_all( "style = 1")
  end

  def self.down
      remove_column :google_maps, :style
  end
end
***********************************************

Here’s what I’m seeing during migration
== CreateGoogleMaps: migrating ===============================================
— create_table(:google_maps)
-> 0.0638s
== CreateGoogleMaps: migrated (0.0640s) ======================================

== CreateMarkers: migrating ==================================================
— create_table(:markers)
-> 0.0537s
== CreateMarkers: migrated (0.0539s) =========================================

== AddMapStyle: migrating ====================================================
— add_column(:google_maps, :style, :integer)
-> 0.0406s
rake aborted!
An error has occurred, all later migrations canceled:

uninitialized constant AddMapStyle::GoogleMaps

I’m using Rails 2.3.11. Any debugging tip is greatly appreciated !

Answer 1

You can safely use Models in migrations like so:

class AddMapStyle < ActiveRecord::Migration
  class GoogleMaps < ActiveRecord::Base; end

  def self.up
      add_column :google_maps, :style, :integer
      GoogleMaps.update_all( "style = 1")
  end

  def self.down
      remove_column :google_maps, :style
  end
end

Since the class is defined inside the migration class, it is in a separate namespace.