Developer technologies | .NET | Entity Framework Core
A lightweight, extensible, open-source, and cross-platform version of the Entity Framework data access technology.
How to fix System.NullReferenceException: Object reference not set to an instance of an object.
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ademclk
21
Reputation points
Mapping aggregates to database
I was mapping my aggregate roots to my database. Made 9 of them without errors but the last one I couldn't make it. Everything seems same but I couldn't figure out.
If you want to check my project files to understand what's going on ademclk/ceyehatapi
If you check my city configurations file I mapped entities like this and it worked fine. I don't know what's the problem with this one.
Help needed. If you want to check issue ademclk/ceyehatapi/issues
I opened a issue at efcore repository on Github https://github.com/dotnet/efcore/issues/30295
Developer technologies | .NET | Entity Framework Core
{count} votes
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Jack J Jun 25,316 Reputation points2023-02-17T09:17:02.8566667+00:00 @ADEM ONUR CELIK, Welcome to Microsoft Q&A, based on my test, I almost reproduced your problem. If possible, could you streamline your code so that we could solve your problem better?
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ademclk 21 Reputation points
2023-02-17T09:57:27.1633333+00:00 @Jack J Jun Now if you clone the repository hard reset to this commit 51f251ae975dc6da416f5d34e24736e5db4817cb
and run dotnet ef migrations it'll work fine. The problem is with the current main branch while mapping the passenger entity. ConfigurePassengersTable() is fine but the other 2 configure methods throws error at wwns many also I'm using postgresql. -
ademclk 21 Reputation points
2023-02-17T09:58:43.51+00:00 @Jack J Jun For your information the other configurations for each aggregate has mapped successfully. I made the same way how I did the others. I tried to debug but I couldn't figure out the problem.
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Jack J Jun 25,316 Reputation points
2023-02-21T09:28:10.42+00:00 @ADEM ONUR CELIK，It seems that you have changed your project in GitHub. I could not find the initial project (problem project). Could you upload the project again? I am doing some researching about your problem.
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ademclk 21 Reputation points
2023-02-22T08:45:21.43+00:00 @Jack J Jun This commit 51f251ae975dc6da416f5d34e24736e5db4817cb has the errors if you hard reset your cloned project. But I found out the error is because of string and Id conversion of aggregate root.
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