On Mon, Dec 31, 2007 at 04:31:40PM +0100, Jaime JB wrote:
>
> Ok this is driving me nuts.
>
> Here's my issue in it's most basic form.
>
> I have a table with a column called amount that was set
to :decimal,
> :precision => 8, :scale => 2
>
> In my controller I try to do something like this.
>
> id = 1
>  ticket = Ticket.find(:first, :conditions =>
['id=?',id])
> ticket.total_amount += params[:amount]
> ticket.direct_amount += params[:amount]
> ticket.save
>
> This returns an error saying that it 'can't copy
BigDecimal'
>
> If I try to user .to_f on my total_amount and
direct_amount and
> params[:amount] I just end up getting an error about
float allocation.
>
> Any ideas? What info can I provide to make this more
helpful?
The actual exception/error messages would be helpful. I'm
assuming that the
Ticket model's total_amount and direct_amount database
fields are decimals
and therefore ActiveRecord treats them as BigDecimal objects
as well as
this amount column you mentioned (which table is it in? You
don't say). I
would expect you to get exceptions like:
TypeError: String can't be coerced into BigDecimal
or
TypeError: nil can't be coerced into BigDecimal
The values in the params hash are always nil, a string, a
hash, or an
array. Since params comes from the parameters sent as text
via HTTP by the
web browser, Rails has no way of knowing that
params[:amount] should be a
number.
Now, I don't see how you would be getting a "can't copy
BigDecimal" error
given the code you show. You should examine the stacktrace
and make sure
that the exception is occurring where you think it is. That
exception will
happen if you try to #dup or #clone a BigDecimal, but I
don't see you doing
that.
> Thanks for any help.
--Greg
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