Sometimes, I need to query lots of data in DB for data processing.
For example, I have a table: Activity, I want to find all the users which create activity in the last month,
I am only concerned about the data arrays, and I don't want to create a lot of Activity models,
Is there any way I can do it?
like this code:
Activity.where('created_at > ?', Time.now - 1.month).get_data(:user_id, :created_at)
=> [[1, 2012-02-01] .... ]