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class AddGroupIdToMilestones < ActiveRecord::Migration
DOWNTIME = false
def up
change_column_null :milestones, :project_id, true
add_column :milestones, :group_id, :integer
end
def down
# We cannot rollback project_id not null constraint if there are records
# with null values.
execute "DELETE from milestones WHERE project_id IS NULL"
remove_column :milestones, :group_id
change_column :milestones, :project_id, :integer, null: false
end
end
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