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    <p><code>floatformat</code> expects its argument to be something it can convert to a <code>Decimal</code> instance, not a form field. <code>form.price_retail</code> is a form field instance (a <code>DecimalField</code>, to be specific).</p> <p><code>DecimalField</code> does accept a <a href="https://docs.djangoproject.com/en/dev/ref/forms/fields/#django.forms.DecimalField.decimal_places" rel="nofollow"><code>decimal_places</code></a> argument, but that's for input validation rather than rounding of existing values.</p> <p>I think you'll need to either <a href="http://docs.python.org/2/library/decimal.html#decimal.Decimal.quantize" rel="nofollow"><code>quantize</code></a> the value yourself - probably in the form's <code>__init__</code> method, or possibly in a subclassed field type or even a custom widget - or render the input element yourself so you can use <code>floatformat</code> directly on the HTML <code>input</code>'s <code>value</code> attribute. I think the simplest way is to do it in the <code>__init__</code>, something like this:</p> <pre><code>class ProductForm(forms.ModelForm): # Meta as above def __init__(self, *args, **kwargs): if 'instance' in kwargs: kwargs['instance'].price_retail = kwargs['instance'].price_retail.quantize(Decimal('0.01')) super(ProductForm, self).__init__(*args, **kwargs) self.fields['price_retail'].widget.attrs['class'] = 'input-price' self.fields['price_retail'].decimal_places = 2 </code></pre> <p>You can of course use whatever rounding strategy you like, as documented for quantize.</p> <p>I <em>think</em> this will not actually change the <code>price_retail</code> value if you submit the form without editing it, because the field will appear not to have changed from its initial value. But I haven't tested that.</p>
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