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def chained_join(*relationships):
"""
Return a chained Join object for given relationships.
"""
property_ = relationships[0].property
if property_.secondary is not None:
from_ = property_.secondary.join(
property_.mapper.class_.__table__,
property_.secondaryjoin
)
else:
from_ = property_.mapper.class_.__table__
for relationship in relationships[1:]:
prop = relationship.property
if prop.secondary is not None:
from_ = from_.join(
prop.secondary,
prop.primaryjoin
)
from_ = from_.join(
prop.mapper.class_,
prop.secondaryjoin
)
else:
from_ = from_.join(
prop.mapper.class_,
prop.primaryjoin
)
return from_
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