7H3LaughingMan wrote:
> I would like to know if it is possible to alter a variable during the
> process of a custom validation. I know that it is no longer validation
> when your altering data but in my opinion there are times when you
> need alter it for simplicity sakes.
That's not what validations are for. You want custom setter methods.
> A good example would be for a
> world wide auction house type application and to to convert currency
> to one single format, when you validate you check to see if both the
> amount is alright along with the currency type. (This is assuming you
> can type in what type of currency it is, and for this example is
> possible.)
With real-world currencies, it is my understanding that this is a bad
idea.
>
> The application I am developing allows the user to type in multiple
> currencies at one (This is a D20 RPG, and people type in something
> along the line of 12 pp 145 gp 78 sp 21 cp) and so far the validation
> process involves converting it all to the lowest currency type.
Again, don't do this in the validator. What you want is something like
this:
CONVERSIONS = {:sp => 10, :gp => 100, :pp => 1000}
def balance=(string)
# parse the string somehow to get the various amounts, then:
bal = cp
bal += gp * CONVERSIONS[:gp]
# likewise for other currencies
self[:balance] = bal
end
There's room for refactoring here, but you get the idea.
Best,
--
Marnen Laibow-Koser
http://www.marnen.org
[email protected]
But
> for the sake of being DRY I would only need to add another line to set
> the variable, but instead it is looking like I would have to repeat
> the whole method and add in the single line and change it that way on
> creation and updates.
--
Posted via http://www.ruby-forum.com/.
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