Template filter to get each attribute value in an iterable

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from django import template

register = template.Library()

@register.filter
def attr_for_each(iterable, attrname):
    """Iterate through the supplied iterable and return the `attrname` eattribute
    of each element in the iterable. Useful with the `join` filter."""
    return [getattr(elem, attrname) for elem in iterable]

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