well .key on any ColumnElement is supposed to be a string name that Query and
others will call upon to assign it a label in the result set. removing .key,
which is unneeded, allows it to work (note expr.clauses):
class PGCompositeElement(expression.FunctionElement):
def __init__(self, base, field, type_):
self.name = field
self.type = to_instance(type_)
super(PGCompositeElement, self).__init__(base)
@compiles(PGCompositeElement)
def _compile_pgelem(expr, compiler, **kw):
return '(%s).%s' % (compiler.process(expr.clauses, **kw), expr.name)
On Mar 25, 2013, at 3:24 PM, Tobias Bieniek <[email protected]>
wrote:
> Sorry, just noticed that I replied directly, instead of to the list. Here are
> the contents for everyone:
>
> Thanks for you help. Using the FunctionElement worked quite well, but
> I had to tweak the constructor and assign the base parameter to
> self.key to make it work properly (failing stack trace at
> https://gist.github.com/Turbo87/b5f49ffeedb3fa288b4f).
>
> Now I've tried the same approach using the declarative method
> (https://gist.github.com/Turbo87/e7fb19b8e532d3e3b6f3) but I get the
> next error: "TypeError: Boolean value of this clause is not defined"
> (stack trace for that is at
> https://gist.github.com/Turbo87/ab5f0ef5159dc85dd0b3 and what I got
> out of the debugger is at
> https://gist.github.com/Turbo87/bef75287f67c0f1f948a)
>
> I hope I'm not stealing too much of your time. Thanks again for the
> great help already!
>
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