unsupported operand type (s) for -: 'NoneType' and 'NoneType'

[Elias Coutinho]

Save some people.

Friends lack sufficient knowledge to try to solve this problem alone.

I have these 3 classes below:

Historical, Account, Payment

In the admin I can list in the History the added values of Account and Payment as well so I will search in the respective models, however I think it is interesting to also present a column with the remaining value, that is, Account - Payment (Clustered value of accounts subtracted from the payment) .

I thought it would be easy to do but it returns me the following error:

unsupported operand type (s) for -: 'NoneType' and 'NoneType'

I know it means the message but I do not know how to solve it.

Has anyone ever experienced this? Can you help me?

[Vinod Kumar]

Hi

It error generate from model string represention where you are trying to add two other relationship model key those don't have any object.

Please let me know if you have any other questions.

Or share with me model structure.

I'm happy to help you.

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[Elias Coutinho]

return (self.totais() or 0) - (self.baixado() or 0)

Geat!

Thank's

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Elias Coutinho.
Aprender sobre alguns assuntos é fundamental.
Aprender sobre Deus é indiscutivelmente o melhor conteúdo.