image courtesy johnson7
App Engine is generally a new paradigm for webapp developers; replacing sessions with memcache and a schemaless datastore just two elements requiring new thinking for old problems. Unfortunately there are a few more hidden nuisances which have the potential to waste programming time relatively early on. Here’s four of my personal head-bangers:
1. the datastore doesn’t always store Properties
I’ve had trouble with it refusing to store arbitrary entity props unless I assign them in the entity constructor itself (these fields were optional btw). Just setting prop values after initialisation then put() on the ds didn’t write them.
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