Hi back,
I haven't used Django Nonrel before. I went through some investigations
over it. Actually this was because I was suspecious about Nonrel's goal to
run native Django ORM on GAE.
As you know Appengine, uses a scheme-less and non-relational database (for
scalabilty) which requires different thinking while designing models and
relations. Using a relational approach when designing database and making
queries may cause a performance decrease when our data scale too big. This
requires using Nonrel very carefully to avoid pitfalls.
I think, main reason of using Nonrel is developing with existing knowledge
from Django without learning details of GAE datastore. But this is not a
true approach since we still need to know what Nonrel does in the
background to maintain scalability. Same effort may be spent on
understanding GAE datastore and using it rather than becoming dependent on
a single tool on this platform. Second reason may be migrating an existing
Django application into GAE without modification, which I think is not a
very good idea too unless It's a small app.
1. I don't know if we use JOINs in existing code. Since I don't have
code in my local machine and use my browser, I can't execute grep command
to find out if there are any. Assuming we use JOINs on queries, Nonrel
supports this with memory operations by running multiple queries. This is
dangerous for big data. Alternatively, we can set denormalizations but this
may cause redundancy.
2. We can use parent mechanism to run queries over mutliple Entity Kinds
efficiently (for example to get all reports a of all nodes in a country).
But Nonrel doesn't suport this.
Anyway, I'm not in the target of changing this but I just wanted to share
my concerns. I didn't study whole of code yet but as far as I see in the
code these restrictions are well taken care of with redundancy.
Best,
--
Orçun Avşar
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