Rails how to sum columns?

Question

Example I have:

@test = Pakke.find([[4], [5]])

In my Pakke table I have a column named prismd

How do I sum the two val

Answer 1

You can summarize directly on the database by creating the respective SQL like this:

Pakke.sum(:prismd, :conditions => {:id => [4,5]})

See ActiveRecord::Calculations for more usage examples and general documentation.