What is the equivalent of none in django templates

Question

I want to see if a field variable is none within a Django template  What is the correct syntax for that   This is what I currently have      if profile user first name is null       lt p gt  --  lt  p gt     elif         profile user first name       profile user last name       endif     In the example above  what would I use to replace  null

User · Answer

You can also use the built-in template filter default:

If value evaluates to False (e.g. None, an empty string, 0, False); the default "--" is displayed.

{{ profile.user.first_name|default:"--" }}

Documentation: https://docs.djangoproject.com/en/dev/ref/templates/builtins/#default

User · Answer

if profile user first name    works  assuming you also don t want to accept       if in Python in general treats None  False                  all as false

User · Answer

You can also use another built-in template default if none     profile user first name default if none  --

User · Answer

You could try this     if not profile user first name value       lt p gt  --  lt  p gt     else         profile user first name       profile user last name       endif     This way  you re essentially checking to see if the form field first name has any value associated with it  See    field value    in Looping over the form s fields in Django Documentation  I m using Django 3 0

User · Answer

Look at the yesno helper  Eg      myValue yesno  itwasTrue itWasFalse itWasNone

User · Answer

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

User · Answer

isoperator   New in Django 1 10     if somevar is None      This appears if somevar is None  or if somevar is not found in the context     endif

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

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