Question

I want to create a calculated field that multiply column1 and column2 on rails 3.

Like this :

totalpoint = column1 * column2

Where is I have to place the code? in the model? How do I write it?

How do I call it from my view?

Answer 1

I think this is better placed on the model

attr_reader :totalpoint

def totalpoint
  column1 * column2
end

Give some instance @m of your model, it can be accessed anywhere (in an action, in the view, etc..) as

@m.totalpoint

You can access this from within the model simply with

@totalpoint