The way this is supposed to work is to use the CreateIndex construct and apply it using events as described at http://docs.sqlalchemy.org/en/rel_1_0/core/ddl.html#controlling-ddl-sequences - that's where execute_if() is present.

But that's not working at the moment. https://bitbucket.org/zzzeek/sqlalchemy/issue/3442/no-control-of-ddl-sequences-for-indexes-fk is added.

As far as your current approach, I don't understand the has_extension thing, if that is the criteria for creating the index then I don't see how execute_if() would help, you'd still have to do that thing.






On 6/8/15 8:51 AM, Adrian wrote:
Currently I have this code which does the job, but it feels extremely dirty:
https://gist.github.com/ThiefMaster/f7a7f7651245ec97a256

My `has_extension` function executes SQL to check if the given postgres extension is installed or not. Something like DDL execute_if would be perfect, but from what I've seen it's not available on the Index class.
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