def get_by_url(self, request, pk=None):
"""
Returns a list of promises related to the article found at a URL passed via query parameter
"""
url = request.query_params.get('url', False)
if not url:
raise ValidationError({'error': 'url is required'})
article = Article.get_or_create_by_url(url=url)
article.analyze_article(redo=True)
context = {'request': request}
serializer = ArticlePromisesSerializer(article, context=context)
return Response(serializer.data)
