On 10/17/2016 11:51 AM, Seth P wrote:
On Monday, October 17, 2016 at 11:24:43 AM UTC-4, Mike Bayer wrote:
However, I don't see how the ordered attributes fixes anything in terms
of mixins. If a mixin wants its columns at the beginning, or the end,
all of that can be upended by the presence of other mixins and those
mixins are necessarily traversed in __mro__ order. It would be awkward
to link __mro__ to declared attribute order to the order the
expressions
that work out to be Column objects go into a Table. IMO it is a lot
easier for a mixin or whatever to simply set "Column(...
sort_order=-1000)" to deal with simple aesthetic concerns such as
these.
I just mean that *within* a mixin (or table class), a set of columns
defined as
col1 = sa.Column(sa.Integer)
@declared_attr
def col2(cls):
return sa.Column(sa.Integer)
col3 = sa.Column(sa.Integer)
@declared_attr
def col4(cls):
return sa.Column(sa.Integer)
col5 = sa.Column(sa.Integer)
would by default appear in order col1, col2, col3, col4, col5.
this would require changes to declarative to work smoothly. It can be
done right now with __prepare__(). I've no plans to work on this myself
unless a contributor is interested in working on it.
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