WebSep 19, 2024 · Setup. In this tutorial we will discuss through a process of building an Hotel Management System. We will be using Python 3.9.6, and Django==3.2.7. Firstly, let’s install the required modules ... WebJul 25, 2012 · 1 Answer. If there is no POST data, then request.POST or None is None, so the form is unbound. Unbound forms are always invalid, but do not have any errors. In your case, you may want to change the else: clause to elif request.POST: See the docs on bound and unbound forms for more details. thank you very much, Django's documentation was …
Checking if image exists - Django (1.3) - Stack Overflow
WebJul 1, 2012 · If var_x.jpg does not exist, just add it to a dictionary: "missing_images" of the form {"var_x":"missing","var_y":"missing"} etc and pass the dictionary to your view then in the template you just need: {% if missing_images.var_x %} display fallback {% else %} display var_x.jpg {% endif %} Share Follow answered Jul 2, 2012 at 0:03 panosmm 183 1 8 WebAug 31, 2009 · class MyModel (models.Model): f1 = models.CharField (max_length=1) def save (self, *args, **kw): if self.pk is not None: orig = MyModel.objects.get (pk=self.pk) if orig.f1 != self.f1: print 'f1 changed' super (MyModel, self).save (*args, **kw) The same thing applies when working with a form. bunker 502 arcachon
django - How to check ImageField is empty - Stack …
WebJul 9, 2011 · 2 The .strip calls str.strip () so you can handle whitespace-only strings as empty, while the preceding check makes sure we weed out None first (which would not have the .strip () method) Proof that it works (in ./manage.py shell ): 12 1 >>> import django 2 >>> from django.template import Template, Context 3 WebMar 26, 2013 · Filter Queryset on empty ImageField. class Book (models.Model): picture = models.ImageField (upload_to='books/', blank=True, null=True) ... I now want to filter the books without a picture. I tried the following: The problem is, that the picture is an empty varchar ('') in the db and not null. What to do? Web2、Django认证系统位置 django.contrib.auth包含认证框架的核心和默认的模型. 3、Django认证系统同时处理认证和授权 认证：验证一个用户是否是它声称的那个人，可用于账号登录 授权：授权决定一个通过了认证的用户被允许做什么. 4、Django认证系统包含的内容 bunker 51 airsoft shop