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getattr template filter

Author:
joshua
Posted:
February 27, 2007
Language:
Python
Version:
Pre .96
Tags:
template filter get
Score:
2 (after 2 ratings)

Put inside mysite/templatetags/getattr.py Add mysite to your INSTALLED_APPS

In your template:

{% load getattr %}
{{ myobject|getattr:"theattr,default value" }}

Thanks to pterk for optimizations! \o/

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from django import template
register = template.Library()

@register.filter
def getattr (obj, args):
    """ Try to get an attribute from an object.

    Example: {% if block|getattr:"editable,True" %}

    Beware that the default is always a string, if you want this
    to return False, pass an empty second argument:
    {% if block|getattr:"editable," %}
    """
    (attribute, default) = args.split(',')
    try:
        return obj.__getattribute__(attribute)
    except AttributeError:
         return  obj.__dict__.get(attribute, default)
    except:
        return default

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Comments

RichardBronosky (on July 24, 2007):

I needed to pass the attribute name as a variable, not a string. So, to make this kind of usage work:

{% field in field_order %}{{ object_list|getattr:field }}, {% endfor %}

I replaced line 14 with:

args = args.split(',')
if len(args) == 1:
    (attribute, default) = [args[0], ''] 
else:
    (attribute, default) = args

I actually wrote my own filter to do this. Then, when I came to post it, I found that this one existed and included a nifty default value. I decided to merge them.

WRoks for me.

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