Let's say I have a model class Child, with an Integer column "birthOrder"
and text column "birthSign", and a class Parent which has "children =
relationship('Child',
collection_class=attribute_mapped_collection('birthOrder'))". This gives
Parent a dictionary "children", keyed by the birth order. I could do a
Parent query with
.join(Child).filter(Child.birthOrder==1).filter(Child.birthSign=="Virgo")
to find all the firstborn Virgos.
I'd like to dynamically build up a similar query, given the text
"children[1].birthOrder" (plus knowledge that the operator and value were
"==" and "Virgo"). I can split that string on "." to get "children[1]",
and seeing the brackets I can assume the attribute_mapped_collection and
split again to get "children" and the value "1", Using inspect(), I can
find out that "children" is a RelationshipProperty of the Child class, But
how can I inspect to find out what column ("birthOrder") was passed in the
attribute_mapped_collection? The RelationshipProperty I get from inspect()
has "collection_class", but this holds a lambda function. Is knowledge
that "birthOrder" was what was used lost inside that, or is there some
other way I can find it?
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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