How to deal with NULL value in template

[Continuation]

I have a field with the null=True option

How do I test for the Null value in template?

I did something like:

{% ifequal field Null %}
do something
{% else %}
do something else

I tested it and it worked. But I want to make sure this is the proper
way to handle Null value in Django. The doc is a bit unclear.

Also does it matter if I type out null as "Null", "null", or "NULL" in
the above example?

[Daniel Roseman]

The Python equivalent of null is None - if you explicitly need to
check for that value, that's how you should spell it.

However normally the better way of doing it is just
{% if field %}
etc, since None is boolean false, as is False, 0 and [].
--
DR.

[Continuation]

I tried

{% if field %}
No
{% else %}
Yes - {{ field }}
{% endif %}

And if the value of field is null, the else statement above ended up
getting executed and output was "Yes - None"

So far for me:

{% ifequal field Null %} and {% ifequal field None %} works.

But

{% if field %}

doesn't.

Did I do something wrong?

[lei sun]

Maybe you just store "Null",which is a simple string, in your sql.Storing None to replace.

2009/12/19 Continuation <selfor...@gmail.com>

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[Daniel Roseman]

On Dec 18, 9:43 pm, Continuation <selforgani...@gmail.com> wrote:
> I tried
>
> {% if field %}
>    No
> {% else %}
>   Yes - {{ field }}
> {% endif %}
>
> And if the value of field is null, the else statement above ended up
> getting executed and output was "Yes - None"
>
> So far for me:
>
> {% ifequal field Null %} and {% ifequal field None %} works.
>
> But
>
> {% if field %}
>
> doesn't.
>
> Did I do something wrong?

You had it the wrong way round. {% if field %} tests whether the field
is *not* None or 0 or '' or []. So swap the Yes and No branches.
--
DR.