def tag_add():
input_list = request.form.getlist('create_tag')
if input_list[0] != '':
tag = Tags(tag=input_list[0])
else:
return redirect("/tags")
post_ids = [int(num) for num in input_list[1:] if num != '']
tag.posts = Posts.query.filter(Posts.id.in_(post_ids)).all()
db.session.add(tag)
db.session.commit()
return redirect("/tags")
