def load_subjects(soup, poem):
"""loads subjects from poem meta tags"""
poem_id = poem.poem_id
subjects = Parse.parse_subjects(soup)
if subjects:
for subject in subjects:
try:
subject_id = Subject.query.filter(Subject.subject_name == subject).one().subject_id
except NoResultFound:
log_err('subject', f, subject)
s = Subject(subject_name=subject)
db.session.add(s)
db.session.flush()
subject_id = s.subject_id
poemsubject = PoemSubject(poem_id=poem_id,
subject_id=subject_id)
db.session.add(poemsubject)
db.session.flush()
