On 5 March 2010 17:02, xxdesmus <[email protected]> wrote:
> So I have a bunch of form fields that I need to add up their
> values, and make sure their sum does not except the value entered in a
> new form field. If the sum does exceed the form field value then I
> want to alert the user and prevent it from saving. Basically I want to
> validate that :atWorkHours.value > ( :hoursMeetings.value
> + :hoursTraining.value + :hoursProjTrav.value )
>
> I tried to do something similar to this in my model...but I assume I
> just had the syntax completely wrong.
Assuming all of the "hours" attributes all return numbers (something,
somewhere is ensuring that, I hope ;-) -- you can add some
validations to your model. Again, there's a couple of ways of doing
this - I normally separate the method that adds the error to base from
the code that checks the condition (so I can check the condition
myself if I want), but you could easily merge them together if you
prefer:
validate :validate_work_hours_not_exceeded
def work_hours_exceeded?
# this is a little different to your equation, as yours would
raise an error if both sides were exactly the same, and I'd guess
that's not the right result - but if not, adjust it to suit
[hours_at_meetings, hours_in_training, hours_travelling].sum >
hours_at_work
end
private
def validate_work_hours_not_exceeded
errors.add_to_base("Do not exceed working hours") if work_hours_exceeded?
end
I took the liberty of tweaking the variable names (although you were
showing them as symbols...) to make them a little more in line with
conventions (and, I think, more easily readable - YMMV :-)
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