I'm trying to figure out how to add objects through the ORM. (My
schema and mappings are below.)
In the shell, I can do the following:
newQ = Question()
# ... set the attributes of newQ
mytype = session.query(QType).first()
mytype.my_sections
# correctly gives all the sections that belong to the type
mytype.my_sections[0].questions
# correctly gives only the questions that belong to both the type and
the section (how does this work btw?)
mytype.my_sections[0].questions.append(newQ)
# inserts only the section_id and question_id into the jointable; it's
missing the type id
How can I get it to also insert the type_id?
Thanks,
Matt
-----------------------------------------------------
questions_table : id | question
sections_table : id | name
types_table : id | name
join_table : type_id | question_id | section_id
class QType(object):
allquestions = association_proxy('joinObj', 'questions')
class QJoin(object): pass
class Question(object): pass
class Section(object): pass
sections_by_type = select(
[join_table.c.type_id, join_table.c.section_id],
group_by=[join_table.c.section_id]).alias('sections_by_type')
mapper(Question, questions_table)
mapper(Section, sections_table, properties={
'questions' :relation(Question, secondary=join_table,
primaryjoin = sections_table.c.id == join_table.c.section_id,
secondaryjoin = join_table.c.question_id ==
questions_table.c.id,
backref='section'),
})
mapper(QJoin, join_table, properties={
'type' :relation(QType),
'sections' :relation(Section, backref='parent'),
'questions' :relation(Question, backref='parent'),
})
mapper(QType, types_table, properties={
'joinObj' :relation(QJoin),
'my_sections' :relation(Section, secondary=sections_by_type,
primaryjoin = types_table.c.id == sections_by_type.c.type_id,
backref='type'),
})
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