I have one function in view like
def calculate(request , b)
I want that this function should work even if b is not passes to it
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4 Answers
You may also need to update your URL dispatch to handle the request with, or without, the optional parameter.
url(r'^calculate/?(?P<b>\d+)?/?$', 'calculate', name='calculate'),
url(r'^calculate/$', 'calculate', name='calculate'),
If you pass b via the URL it hits the first URL definition. If you do not include the optional parameter it hits the second definition but goes to the same view and uses the default value you provided.
3 Comments
naktinis
Can you use both definitions in
reverse('calculate', ...)?
vjimw
Yes, you can provide both args and kwargs as attributes passed to the reverse method.
Mario Orlandi
Super-correct ! Alternatively, since defining two separate urls is necessary, you might want to specify the default value of the missing parameter in the url itself, to keep all decisions in one place:
url(r'^calculate/$', 'calculate', {'b': 3}, name='calculate'),def calculate(request, b=3):
answered Jun 27, 2011 at 12:44
Ignacio Vazquez-Abrams
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Comments
Passing a default value to the method makes parameter optional.
In your case you can make:
def calculate(request, b=None)
pass
Then in your template you can use condition for different behaviour:
{% if b %}
Case A
{% else %}
Case B
{% endif %}
