Python 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 21:26:53) [MSC v.1916 32 bit (Intel)] on win32
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>>> from domdit import db
>>> from domdit.models import Blog, PostTag, tags
>>> db.create_all()
>>> x = Blog.query.first
.....
sqlalchemy.exc.NoForeignKeysError: Could not determine join condition between parent/child tables on relationship Blog.tags -
there are no foreign keys linking these tables via secondary table 'tags'.  Ensure that referencing columns are associated wit
h a ForeignKey or ForeignKeyConstraint, or specify 'primaryjoin' and 'secondaryjoin' expressions.