Flask - store object directly in a session [duplicate]

Question

I was wondering if it is possible to store an object directly in a Flask session, without the need to rewrite the serializer. Are there any functions I need to implement in my class in order to get this working? Sample code that is below. This is what I want it to look like. However, when you try to execute that it throws an error à la TypeError: Object of type 'Test' is not JSON serializable

Any help is greatly appreciated! Thanks in advance! :)

import flask from flask import Flask, session, redirect class Test: def __init__(self, x, y, z): self.x = x self.y = y self.z = z app = Flask(__name__) app.secret_key = 'xyz' @app.route('/') def main(): session['my_object'] = Test(1, 2, 3) return redirect('retrieve') @app.route('/retrieve') def return_my_object(): my_object = session.get('my_object') return str(my_object) if __name__ == '__main__': app.run(debug=True)

similar question: stackoverflow.com/questions/3768895/…

VPfB
– VPfB

2017-08-08 13:53:42 +00:00
Commented Aug 8, 2017 at 13:53 — VPfB
– VPfB, Commented Aug 8, 2017 at 13:53

bgse · Accepted Answer · 2017-08-08 12:07:40Z

10

A simple way to make your object serialize and achieve what you want is to use __dict__ like so:

def main(): session['my_object'] = Test(1, 2, 3).__dict__ return redirect('retrieve')

answered Aug 8, 2017 at 12:07

bgse

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2 Comments

Sven Marnach Over a year ago

I prefer vars(Test(1, 2, 3)), over accessing __dict__ directly, but that's essentially the same. Note that you will also need to deserialize the dictionary to a Test object. I recommend adding methods to_json() and from_json() to the Test class and calling them manually.

fweidemann14 Over a year ago

thank you guys, working perfectly! ;)

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