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displaying data from from many-to-many table

ok, I'm new with MySQL, and this is a simple exercise for practice, so please bare with me. My goal is to display all posts with their categories underneath them. The code below accomplishes this, ...
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Plan for dealing with eventual query consistency

I'm using App Engine's HRD datastore which only has eventual consistency. This means that if my client saves an update to an entity, I receive a guarantee that the entity will eventually be updated, ...