@register.filter
def has_rated(user, obj):
    return rating_score(obj, user) is not None
Creates a SOLR query string and runs it on SOLR. 
dataset/ETHPy150Open django-de/django-simple-ratings/ratings/templatetags/ratings_tags.py/has_rated--crossover with--dataset/ETHPy150Open AppScale/appscale/SearchService/solr_interface.py/Solr.run_query