I've got a kind of goofy schema, and I'm trying to map it. I've got
Questionnaire types, Sections and Questions all joined in a single
association table:
join_table : type_id | section_id | question_id
questions_table : id | question_text
sections_table : id | section_name
types_table : id | type_name
So, a single question can appear in different sections for different
types. How do I do the mapping? This is what I've got, and it
doesn't work.
mapper(Question, questions_table)
mapper(Section, sections_table, properties={
'questions':relation(Question, backref='section',
secondary=join_table)
})
mapper(QType, types_table, properties={
'sections':relation(Section,
backref = 'type',
secondary = join_table
primaryjoin = types_table.c.id==join_table.c.type_id,
secondaryjoin = join_table.c.section_id==sections_table.id
)
})
I get this error when I try to save a type object:
AttributeError: 'PropertyLoader' object has no attribute
'_dependency_processor'
Thanks,
Matt
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