def word_in_context(request, dataset, analysis, word, topic=None):
analysis = Analysis.objects.get(name=analysis, dataset__name=dataset)
w = Word.objects.get(dataset__name=dataset, type=word)
word_context = WordSummary(word)
if topic is None:
docset = w.documentword_set.all()
else:
topic = Topic.objects.get(analysis=analysis, number=topic)
docset = topic.documenttopicword_set.filter(word=w)
num_docs = len(docset)
d = docset[random.randint(0, num_docs - 1)]
word_context.left_context, word_context.word, word_context.right_context \
= d.document.get_context_for_word(word, analysis, topic.number if topic else None)
word_context.doc_name = d.document.filename
word_context.doc_id = d.document.id
return HttpResponse(anyjson.dumps(vars(word_context)))
