session-cart / session_cart / context_processors.py

from session_cart.utils import get_carts


def carts(request):
    """
    Returns all session carts as 'carts', and the default cart (if one is
    provided) as 'cart'.

    """
    context = {}
    carts = getattr(request, 'carts', None)
    if carts:
        if 'default' in get_carts():
            context['cart'] = carts['default']
        context['carts'] = carts
    return context
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