django-expression-fields allows typing mathematical expressions into form fields and having only the calculated result stored in the database.

## Project description

django-expression-fields lets your users type a mathematical expression in a form field. Python does the math and stores the result in the database. For example, suppose you have a model to track Things, like this:

class Thing(models.Model):
cost = models.DecimalField(
max_digits=5, decimal_places=2, null=True, blank=True)

Suppose Things come in packs of 12 for $7.99. Your users have to do some math to fill in the cost of a single Thing,$0.67.

But not with an expression field! Create your form like this:

class ThingForm(forms.Form):
cost = DecimalExpressionField(
max_digits=5, decimal_places=2, required=False)

Now your user can simply type 7.99/12 in the field and Python will do the math for them!

## Project details

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