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You may want to look at gform_update_meta instead of update_post_meta. As far as I'm aware gravity forms stores entries in a separate table. So while update_post_meta may work for lower form ID numbers it will start to fail once your form entries exceed the number of blog posts on your site (if that makes sense)
This is great. However, I'm curious if this can work with dropdowns, radio buttons.
Very useful, but where does the number 29 come from? Regarding the address field