Sorry, I fixed the example.

Thanks for your response. I tried locally the solution you provided (removing key: true for IdPrimaryKey column) and it worked, but I’d like to know what’s the “key” option for. BTW, I never changed the jsonreader option, always used it by default.

I’ve also used the Trirand MVC library in a project I used to work (for a company a few years ago) and I remember there was a primary key property that we set to “true” and the html helper generated the “key: true”, so I was doing it the same way when I configured this colmodel without that library. I find it a little odd that I have to remove that option it in version 5 to get the same behavior version 4 had.