You can do validation inside the template to check the data
and raise errors accordingly. You can also check the data
so you should be able to check if instance.property.id is
a valid value and then only use it, if it is. It all comes down
to how you would like your template tag to function. In some
cases where you maybe misuse the template tag, having it
raise an error so you can spot the problem is really useful.
~Jakob
On 28 Maj, 18:25, juanefren <juanef...@gmail.com> wrote:
> I have created a custom tag to generate select inputs from my database
> models it is registered as a simple tag.
> Everything is fine, except that I should do this to avoid my problem
> is that calling my tag of this way {% combo "model"
> instance.property.id %} raises TemplateSyntaxError when object is
> None. right now I should do this:
>
> {% if instance.property %}
> {% combo "model" instance.property.id %}
> {%else%}
> {% combo "model" %}
> {%endif%}
>
> Is there a cleaner way to avoid the error ?
> Thanks...
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