datasources.py

from nav.models.rrd import RrdDataSource

datasources = RrdDataSource.objects.filter(rrd_file__key='interface').select_related('rrd_file')

    
datasource_loookup = {}
for data in datasources:
    interface = int(data.rrd_file.value)
    if interface in datasource_loookup:
        datasource_loookup[interface].append(data)
    else:
        datasource_loookup.update( {interface: [data] } )