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class AddLastActivityColumnIntoProject < ActiveRecord::Migration
def up
add_column :projects, :last_activity_at, :datetime
add_index :projects, :last_activity_at
select_all('SELECT id, updated_at FROM projects').each do |project|
project_id = project['id']
update_date = project['updated_at']
event = select_one("SELECT created_at FROM events WHERE project_id = #{project_id} ORDER BY created_at DESC LIMIT 1")
if event && event['created_at']
update_date = event['created_at']
end
execute("UPDATE projects SET last_activity_at = '#{update_date}' WHERE id = #{project_id}")
end
end
def down
remove_index :projects, :last_activity_at
remove_column :projects, :last_activity_at
end
end
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