How to concatenate two variables in a template for evaluation..

Hayyan Rafiq

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Aug 9, 2011, 5:19:32 PM8/9/11

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hi I have been playing around with a certain scenario
Consider the following

{% for title in field %}
<td>{{obj}}{{.title}}</td>
{% endfor %}

Here obj is an object
and title are the various fields of that object.
How can i evaluate the entire thing in a template

Example
I want it to end up like this
{{obj.title}}
How can i do that from my previous code..
Any suggestions would be appreciated...

Shawn Milochik

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Aug 9, 2011, 5:25:42 PM8/9/11

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You have to write it as {{ obj.title }} in your template. Django
templates are designed to allow very little in the way of logic; that
should take place in your views.

Hayyan Rafiq

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Aug 9, 2011, 5:37:25 PM8/9/11

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Okay then which way do u recommend that i should follow in case
i need to displays objects with different no of properties
Example obj has propA and PropB
{{obj.propA}}
{{obj.propB}}
would work but i want it to be dynamic since the no and name of properties may vary..
I tried writing all the properties of an object in a list and passing that list obj to template
but it seems this is not just possible.. since
            {% for prop in properties %}
            <td>{{obj}}+{{.prop}}</td>
            {% endfor %}
or other things similar to above do not work

Any suggestions..

> Date: Tue, 9 Aug 2011 17:25:42 -0400
> Subject: Re: How to concatenate two variables in a template for evaluation..
> From: sh...@milochik.com
> To: django...@googlegroups.com

>
> You have to write it as {{ obj.title }} in your template. Django
> templates are designed to allow very little in the way of logic; that
> should take place in your views.
>

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bruno desthuilliers

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Aug 9, 2011, 6:35:24 PM8/9/11

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On 9 août, 23:37, Hayyan Rafiq <hayya...@hotmail.com> wrote:
> Okay then which way do u recommend that i should follow in case
> i need to displays objects with different no of properties
> Example obj has propA and PropB
> {{obj.propA}}
> {{obj.propB}}
> would work but i want it to be dynamic since the no and name of properties may vary..

Then you need a custom template filter. Something like this should do
the trick:

# in your templatetags module:

@register.filter
def get_attribute(obj, name):
return getattr(obj, name, u"")

# in your template

{% load youtemplatetags %}

{% for attrname in attributes %}
{{ obj|get_attribute:attrname }}
{% endor %}