Adding automatic column calculation

Rails
1

Hi,

I want to add a column that would get calculated automatically
whenever I update an object.
For example, a checksum, of other columns in the model.

It should run whenever I do save, save!, update_attributes, etc.

Where would be a logical place to add this in my model?

Thanks,
Helzer

2

On Jun 10, 1:54 am, helzer [email protected] wrote:

Hi,

I want to add a column that would get calculated automatically
whenever I update an object.
For example, a checksum, of other columns in the model.

It should run whenever I do save, save!, update_attributes, etc.

Where would be a logical place to add this in my model?

before_save ?

Fred

3

class YourModel
def before_save
your callback code …
end
end

http://railsmanual.com/module/ActiveRecord::Callbacks

4

Thanks a lot Fred and alberto. I was just going to reinvent the wheel
here…

Helzer