Asp.Net Core Error: InvalidOperationException: The database generated a null value for non-nullable property 'PropertyName' of entity type 'EntityName'. Ensure value generation configuration in the database matches the configuration in the model

Problem: InvalidOperationException: The database generated a null value for non-nullable property 'PropertyName' of entity type 'EntityName'. Ensure value generation configuration in the database matches the configuration in the model.

Solution: Make sure that your DBContext has a DBSet<YourModalName> givenName {get; set;}
Also, make sure you read the documentation found on Microsoft's website LinkHere.

Furthermore, it does not hurt to check for other possible causes that might be contributing to the error.
To resolve the InvalidOperationException related to a null value for a non-nullable property in ASP.NET Core, follow these steps:

1. Verify the Entity Framework Core configuration:

   • Check the configuration in your entity class (EntityName) and ensure that the corresponding property (PropertyName) is marked as non-nullable if it should not allow null values.
   • Make sure that the property is not explicitly configured with the IsRequired(false) option, which would allow null values.

2. Check the database schema:

   • Ensure that the corresponding column for the PropertyName property in the database table is configured correctly to disallow null values.
   • If the column allows null values, you need to update the database schema to reflect the correct configuration.

3. Migrate or update the database:

   • If you have made changes to the entity class or the database schema, you need to apply these changes to the database using Entity Framework Core migrations or database update commands.
   • Run the necessary migration commands (dotnet ef migrations add, dotnet ef database update, etc.) to synchronize the database schema with your entity model.

4. Seed or populate initial data:

   • If you have existing data in the database and the non-nullable property (PropertyName) does not have a default value, so make sure that the existing data is updated to provide a valid value for the property.
   • Alternatively, you can modify the migration or data-seeding process to ensure that the non-nullable property is initialized with a valid value.

By following the steps above, you should be able to resolve the InvalidOperationException related to a null value for a non-nullable property in ASP.NET Core. Ensure that the configuration in your entity model and the database schema are aligned, and update the necessary components accordingly.