List of unique values for a property in Google App Engine
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20-06-2021 - |
Question
I'm currently rewriting a python GAE app in Java, and am question my entity design. I have entities like the following so that I could query the datastore and easily get back a unique list of designers:
class Designer
- Name : String
class Jean
- Designer : Designer
The code would be much simpler if I get rid of the Designer class since all it does is wrap a String, but I can't do a SELECT DISTINCT Designer FROM Jean
to get a list of Jean designers. Is the first approach the correct one, or is there another way?
Solution
GAE(datastore-bigtable) doesn't support the complex query like SQL, So then you'll have to design your own model(db) structure like as you explained earlier.
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