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Editorial Team
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Asked: 2026-06-13T06:54:10+00:00

I’m trying to write a form clean method to ensure that an entered pair

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I’m trying to write a form clean method to ensure that an entered pair of dates is not currently covered by date ranges stored in the model.

So I want to catch fromdate >= value <= todate but the between filters in my clean methods aren’t getting it.

Can anyone offer some enlightenment?

Models.py

class Dates(models.Model):
    fromdate = models.DateField()
    todate = models.DateField()

Forms.py

class Form(forms.Form):
    fromdate = forms.DateField()

    todate = forms.DateField()

    class Meta:
        model = Dates

    def clean_fromdate(self):
        form_fromdate = self.cleaned_data.get('fromdate')

        exists = Dates.objects.filter(fromdate__contains=form_fromdate).exists()
        if exists == True:
            raise forms.ValidationError(_("A period is already entered for this date"))

        between = Dates.objects.filter(fromdate__gte=form_fromdate,
            todate__lte=form_fromdate).exists()
        if between == True:
            raise forms.ValidationError(_("Period already between this date 1"))

        return form_fromdate


    def clean_todate(self):
        form_todate = self.cleaned_data.get('todate')

        exists = Dates.objects.filter(todate__contains=form_todate).exists()
        if exists == True:
            raise forms.ValidationError(_("A period is already entered for this date"))

        between = PeriodsOfInactivity2012.objects.filter(fromdate__gte=form_todate,
            todate__lte=form_todate).exists()
        if between == True:
            raise forms.ValidationError(_("Period already between this date 2"))

        return form_todate
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1 Answer

  1. Editorial Team

    This should work for you

    from django import forms
from models import Dates

class Form(forms.ModelForm):
    fromdate = forms.DateField()
    todate = forms.DateField()

    class Meta:
        model = Dates

    def clean(self):
        form_fromdate = self.cleaned_data.get('fromdate')
        form_todate = self.cleaned_data.get('todate')
        between = Dates.objects.filter(fromdate__gte=form_fromdate, todate__lte=form_todate).exists()
        if between:
            raise forms.ValidationError("Period already between this dates")
        super(Form, self).clean()

    EDIT

    #views.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from django.http import HttpResponse
from django.template import RequestContext
from django.shortcuts import render_to_response

from forms import Form

def index(request, template='index.html'):
    form = Form()
    if request.method == "POST":
        form = Form(request.POST)
        if form.is_valid():
            return HttpResponse(form)

    kwvars = {
        "form": form,
    }
    return render_to_response(template, kwvars, context_instance=RequestContext(request))

    #forms.py
from django import forms
from models import Dates

class Form(forms.ModelForm):
    fromdate = forms.DateField()
    todate = forms.DateField()

    class Meta:
        model = Dates

    def clean(self):
        form_fromdate = self.cleaned_data.get('fromdate')
        form_todate = self.cleaned_data.get('todate')
        between = Dates.objects.filter(fromdate__gte=form_fromdate, todate__lte=form_todate).exists()
        if between:
            raise forms.ValidationError("Period already between this date 1")
        super(Form, self).clean()

    #index.html
<html>
<head>
</head>
<body>
<form action="" method="POST">
    {% csrf_token %}
    {%  if form.errors %}
        errors: {{ form.errors }}
    {% endif %}
    {{ form }}
    <input type="submit" value="submit">
</form>
</body>
</html>
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