gitlabhq/db/migrate/20121218164840_move_noteable_commit_to_own_field.rb

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class MoveNoteableCommitToOwnField < ActiveRecord::Migration
def up
add_column :notes, :commit_id, :string, null: true
add_column :notes, :new_noteable_id, :integer, null: true
Note.where(noteable_type: 'Commit').update_all('commit_id = noteable_id')
Note.where("noteable_type != 'Commit'").update_all('new_noteable_id = CAST (noteable_id AS INTEGER)')
remove_column :notes, :noteable_id
rename_column :notes, :new_noteable_id, :noteable_id
end
def down
remove_column :notes, :commit_id
remove_column :notes, :new_noteable_id
end
end