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Validate end_date is bigger than start_date in Django Model Form

I have start_date and end_date fields in my model, I want to assign an end_date error when it is larger than start_date, I searched for documents, but I can not find an example about this.

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3 answers

You need a special cleanup function in your form that does a check:

def clean(self):
    start_date = cleaned_data.get("start_date")
    end_date = cleaned_data.get("end_date")
    if end_date < start_date:
        msg = u"End date should be greater than start date."
        self._errors["end_date"] = self.error_class([msg])
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This is the actual recommended example from docs.

In short, remember to return cleaned_data and handle form errors correctly.

from django import forms

class ContactForm(forms.Form):
    # Everything as before.
    ...

    def clean_recipients(self):
        data = self.cleaned_data['recipients']
        if "fred@example.com" not in data:
            raise forms.ValidationError("You have forgotten about Fred!")

    # Always return the cleaned data, whether you have changed it or
    # not.
    return data
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Django 2.2 - doc

from django import forms
from .models import Project

class ProjectAddForm(forms.ModelForm):
    class Meta:
        model = Project
        fields = [
            'name', 
            'overview',
            'start_date',
            'end_date',
            'status',
            'completed_on',
        ]

        labels = {
            "name": "Project Name",
            "overview": "Project Overview",
            "status": "Project Status",
        }

    # Logic for raising error if end_date < start_date
    def clean(self):
        cleaned_data = super().clean()
        start_date = cleaned_data.get("start_date")
        end_date = cleaned_data.get("end_date")
        if end_date < start_date:
            raise forms.ValidationError("End date should be greater than start date.")
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