ArgumentError: relationship expects a class or mapper argument

Question

I am getting this strange error, and I\'m saying strange because I made a change to an unrelated table.

I am trying to query my tDevice table which look

Answer 1

not happy with myself since it's such a dumb mistake but here is my culprit:

report_type = relationship('tReportType',
                           uselist=False,
                           backref=backref('report'))

should be:

report_type = relationship('TReportType',
                           uselist=False,
                           backref=backref('report'))

capital T instead of t, I should be referencing the class, not my actual table name: 'tReportType' -> 'TReportType'