App Engine Entity to Dictionary

Question

What is a good way to copy a google app engine entity (in python) to a dictionary object? I'm using db.Expando objects. All properties are expando properties.

Thanks!

What are you trying to achieve? There may be a better way to do this, depending on what you need to do. — Nick Johnson, May 16 '11 at 00:42
Hey Nick, I was trying to turn it into some JSON so I could provide it as a REST resource — Chris Dutrow, May 19 '11 at 21:04

score 4 · Accepted Answer · edited May 10 '11 at 18:56

4

Having an entity called foo try with:

foo.__dict__

edited May 10 '11 at 18:56

systempuntoout

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answered May 10 '11 at 18:50

Aater Suleman

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this solution gives you everything on the object, for Model objects, user the properties method and for Expando's use the dynamic_properties method – Tom Willis May 10 '11 at 21:16
@Tom Willis - I Believe the "properties" and "dynamic_properties" methods return just the keys, requiring an iteration to get everything copied. "dynamic_properties" is also a key in the __dict__ object though, so I believe you can do: foo.__dict__['dynamic_properties'] – Chris Dutrow May 10 '11 at 22:18
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This is a bad idea - as @Tom says, it'll return all the members of the object, which is not the same as a dict of properties. – Nick Johnson May 16 '11 at 00:41
Correction, its: foo.__dict__['_dynamic_properties'] (added underscore) – Chris Dutrow May 19 '11 at 22:14
@Dutrow A better idea would be to use `properties` and `dynamic_properties` - you shouldn't rely on internal implementation details. – Nick Johnson May 22 '11 at 18:35

score 2 · Answer 2 · answered Dec 18 '19 at 11:54

2

This should work

from google.appengine.ext import db
db.to_dict(entity)

answered Dec 18 '19 at 11:54

shilpi

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score 2 · Answer 3 · answered May 10 '11 at 21:10

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try this. Where "m" is the instance of the Expando you wish to turn into a dictionary.

dict([(x,getattr(m,x)) for x in m.dynamic_properties()])

answered May 10 '11 at 21:10

Tom Willis

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score 0 · Answer 4 · answered Aug 02 '18 at 17:01

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The new version of the Google Cloud Python client library doesn't work quite so gracefully. So this is a quick fix.

your_dict = {x: entity[x] for x in entity.keys()}

Remember, the strings are passed in and returned as unicode, not basestring. ;)

answered Aug 02 '18 at 17:01

Dovy

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score -2 · Answer 5 · answered Nov 27 '17 at 15:26

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The accepted answer should be:

{}.update(entity}

answered Nov 27 '17 at 15:26

Camille Tolsa

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This doesn't work for me. Can you elaborate? Also there is something wrong with your brackets. – elevendollar Jun 05 '19 at 11:23

App Engine Entity to Dictionary

5 Answers5

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