Re: How to validate a form field whose value can only increase?

You're absolutely right. I don't know what I was thinking. Thanks! On Dec 7, 8:42 pm, Shawn Milochik wrote: > On Dec 7, 2009, at 7:16 PM, Continuation wrote: > > > > > I thought if form.is_valid() returns False, Django would send a list > > of the errors to browser. But

Re: How to validate a form field whose value can only increase?

On Dec 7, 2009, at 7:16 PM, Continuation wrote: > > I thought if form.is_valid() returns False, Django would send a list > of the errors to browser. But that's not what happened here. Do you have anything like these in your template? {{ my_form.errors }} {{ my_form.field_name.errors }} Shawn

Re: How to validate a form field whose value can only increase?

Hi, Thank you very much for your help. I used your form validation method. The results is weird. I tested it with a value lower than the previous value. But didn't see any error message in my browser. I stepped through the code using pdb. I could see that forms.ValidationError("The amount in

Re: How to validate a form field whose value can only increase?

On Dec 6, 2009, at 11:01 PM, Continuation wrote: > What do you mean by the __init__ of the model? > Every models.Model object has an __init__ function, like any Python class. You need to override it. Add this into your model (in your models.py): def __init__(self, *args, **kwargs):

Re: How to validate a form field whose value can only increase?

What do you mean by the __init__ of the model? My directory structure is: myapp/models MyModel lives inside myapp/models. There's an __init__.py file within myapp, but it's empty and I've never touched it. Can you be more specific about what to do? Thanks. On Dec 6, 10:52 pm, Shawn Milochik

Re: How to validate a form field whose value can only increase?

The easiest way I know of is this: In the __init__ of the model, create a variable: self.old_value = self.fieldname. In the save() function, you can check self.fieldname against self.old_value. Shawn -- You received this message because you are subscribed to the Google Groups "Django

How to validate a form field whose value can only increase?

I created a form class based on a model: class MyModel(models.Model): increasing_field = models.PositiveIntegerField() class MyForm(forms.ModelForm): class Meta: model = MyModel I created a form to change an existing MyClass instance using POST data to populate the