Author Archives: erictummers

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About erictummers

Working in a DevOps team is the best thing that happened to me. I like challenges and sharing the solutions with others. On my blog I’ll mostly post about my work, but expect an occasional home project, productivity tip and tooling review.

Installed macOS Catalina on my MacBook Early 2009

Posted on June 8, 2020 by erictummers

I still have my Early 2009 MacBook for my kids. It runs El Capitan and Windows 10 (bootcamp). Installation of macOS Catalina on my macbook 5,2 is unsupported. With the Catalina patcher from DosDude1 the installer can be tricked to … Continue reading →

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Working keyboard only

Posted on May 27, 2020 by erictummers

I’ve tried working keyboard only (no mouse) for two weeks and learned to live with shortcuts. Here are my tips-and-tricks. Just do it Put your mouse out of reach. Disconnect it. Turn it off. Just do it.You’ll feel helpless for … Continue reading →

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Upgraded Windows 7 to 10 on my MacBook Early 2009

Posted on May 15, 2020 by erictummers

I still have my Early 2009 MacBook for my kids. It runs El Capitan and Windows 7 (bootcamp). Since the support for Windows 7 ended on January 14 2020 an upgrade was needed. Unfortunately the bootcamp 3 that comes with … Continue reading →

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Bogus – testdata generator

Posted on May 1, 2020 by erictummers

Photo by Steve Harvey on Unsplash https://www.nuget.org/packages/bogus Creating testdata is not my favourite task. With bogus I can define the rules the data must adhere and generate as much data as I need. The rules are setup with fluent syntax … Continue reading →

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EF core: entity cannot be tracked

Posted on April 21, 2020 by erictummers

We use EF core to store a bulk of data with an auto-number primary key. The auto-number is an Identity column in Sql Server. When inserting a large amount of records with related children we encounter this error: System.InvalidOperationException entity … Continue reading →

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