What is the proper way to declare a postgresql partial index when using the
@declared_attr decorator?
This form gives me "Cannot compile Column object until its 'name' is
assigned":
track_type = Column(SmallInteger, nullable = False)
@declared_attr
def __table_args__(cls):
return (Index("idx_track_type", "track_type",
postgresql_where = (cls.track_type != 0)),
)
and this form gives me "AttributeError: 'str' object has no attribute
'_compiler_dispatch'":
track_type = Column(SmallInteger, nullable = False)
@declared_attr
def __table_args__(cls):
return (Index("idx_track_type", "track_type",
postgresql_where = "track_type != 0"),
)
>From [this post][1] I learned about the use of sqlalchemy.sql.text, so this
is now working for me:
from sqlalchemy.sql import text as sql_text
# <snip>
@declared_attr
def __table_args__(cls):
return (Index("idx_track_type", "track_type",
postgresql_where = sql_text("track_type != 0")),
)
That post also indicated there may be a bug here, but that was almost 2
years ago. Is there a better way to do it now? More importantly, will the
working code above continue to work in the future?
[1]: http://goo.gl/Fmgynh
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