[python] What is the equivalent of "none" in django templates?

None, False and True all are available within template tags and filters. None, False, the empty string ('', "", """""") and empty lists/tuples all evaluate to False when evaluated by if, so you can easily do

{% if profile.user.first_name == None %}
{% if not profile.user.first_name %}

A hint: @fabiocerqueira is right, leave logic to models, limit templates to be the only presentation layer and calculate stuff like that in you model. An example:

# someapp/models.py
class UserProfile(models.Model):
    user = models.OneToOneField('auth.User')
    # other fields

    def get_full_name(self):
        if not self.user.first_name:
            return
        return ' '.join([self.user.first_name, self.user.last_name])

# template
{{ user.get_profile.get_full_name }}

Hope this helps :)

Examples related to python

programming a servo thru a barometer Is there a way to view two blocks of code from the same file simultaneously in Sublime Text? python variable NameError Why my regexp for hyphenated words doesn't work? Comparing a variable with a string python not working when redirecting from bash script is it possible to add colors to python output? Get Public URL for File - Google Cloud Storage - App Engine (Python) Real time face detection OpenCV, Python xlrd.biffh.XLRDError: Excel xlsx file; not supported Could not load dynamic library 'cudart64_101.dll' on tensorflow CPU-only installation

Examples related to django

How to fix error "ERROR: Command errored out with exit status 1: python." when trying to install django-heroku using pip Pylint "unresolved import" error in Visual Studio Code Is it better to use path() or url() in urls.py for django 2.0? Unable to import path from django.urls Error loading MySQLdb Module 'Did you install mysqlclient or MySQL-python?' ImportError: Couldn't import Django Django - Reverse for '' not found. '' is not a valid view function or pattern name Class has no objects member Getting TypeError: __init__() missing 1 required positional argument: 'on_delete' when trying to add parent table after child table with entries How to switch Python versions in Terminal?

Examples related to django-forms

__init__() got an unexpected keyword argument 'user' What's the best way to store Phone number in Django models How to create Password Field in Model Django Django Forms: if not valid, show form with error message What is the equivalent of "none" in django templates? How to create password input field in django Python regex for integer? Change a Django form field to a hidden field CSS styling in Django forms Django: Model Form "object has no attribute 'cleaned_data'"

Examples related to django-templates

Django - Did you forget to register or load this tag? How to add url parameters to Django template url tag? bootstrap 3 wrap text content within div for horizontal alignment Django, creating a custom 500/404 error page How can I get the username of the logged-in user in Django? Does Python have a toString() equivalent, and can I convert a db.Model element to String? How do I call a Django function on button click? What is the equivalent of "none" in django templates? Django - iterate number in for loop of a template Django -- Template tag in {% if %} block

Examples related to django-views

Unable to import path from django.urls Class has no objects member The view didn't return an HttpResponse object. It returned None instead django - get() returned more than one topic __init__() got an unexpected keyword argument 'user' How can I get the username of the logged-in user in Django? Django DoesNotExist How do I call a Django function on button click? Django optional url parameters Update only specific fields in a models.Model