Rails - May 2007 - HOW TO: Implementing discounts in an invoicing/billing/pos system. . .?

Hi All,

I''m in the process of creating an invoicing/billing/pos-esque package
with Rails.  It was suggested I do something I''m excited about and
potentially even need in order to motivate me; so, that''s what
I''m
doing.

Aaaaaanywho, I''ve got a bit of an implementation question.  I want
this application to be as "real-world" as possible.  That being the
case, I''m having an issue with how to implement discounts.  Personally
I usually only discount on the basis of the entire order whenever
billing.  However, I''m sure certain ones discount on a per-line-item
basis.

So, I guess, I''m basically asking for implementation suggestions when
it comes to discounts.  For instance should I implement a discount:


1) per invoice?

2) per line item?

3) on both?

4) by some mechanism not mentioned here?


. . .please provide a few details to back up your suggestion(s) if at
all possible.

Thanks,
Michael


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depends on how you want to do it ;-)

very roughly and off the top of my head, i''d think you could
accomplish #3 like so:

class Order < AR::B
  has_many :order_discounts

  def get_total_with_discounts
    ... total the line_items with respective discounts if any...
    ... return total with order_discounts applied if any...
  end
end

class LineItem < AR::B
  has_many :line_item_discounts
end

this assumes multiple discounts are allowed for Order and LineItem...
otherwise use has_one

hope this helps

On May 29, 10:44 am, gberz3
<gbe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi All,
>
> I''m in the process of creating an invoicing/billing/pos-esque
package
> with Rails.  It was suggested I do something I''m excited about and
> potentially even need in order to motivate me; so, that''s what
I''m
> doing.
>
> Aaaaaanywho, I''ve got a bit of an implementation question.  I want
> this application to be as "real-world" as possible.  That being
the
> case, I''m having an issue with how to implement discounts. 
Personally
> I usually only discount on the basis of the entire order whenever
> billing.  However, I''m sure certain ones discount on a
per-line-item
> basis.
>
> So, I guess, I''m basically asking for implementation suggestions
when
> it comes to discounts.  For instance should I implement a discount:
>
> 1) per invoice?
>
> 2) per line item?
>
> 3) on both?
>
> 4) by some mechanism not mentioned here?
>
> . . .please provide a few details to back up your suggestion(s) if at
> all possible.
>
> Thanks,
> Michael

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