On 03/16/2016 11:23 AM, Piotr Dobrogost wrote:

so TextValue and Node should be implicitly joined according to rules for
joined table polymorphism in SA.

this is not supported - please read the caveats at


http://docs.sqlalchemy.org/en/rel_1_0/orm/query.html?highlight=query.update#sqlalchemy.orm.query.Query.update


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