Duplicate object values in ASP.NET MVC Display Templates? Easy fix!

Duplicate String values

Are you getting duplicate object values (or whatever those Objects output in .ToString())? Eh, so was I, after I edited the display template for String. Found a fix, though.

Description

Okay – I just ran into one of my more stupid mistakes since.. Well, since forever.

I had made some quick and simple edits in String.cshtml display template (among quite a few other edits before building again and seeing what happened), as I added support for Enum values there. After that I started getting duplicate values for String-typed properties. 

Apparently, mistakes were made.

Solution

Luckily, this was easy to fix (but probably still worth documenting):

I had added the code for handling Enum-values, and also changed “@model String” -declaration to awful “@Model object” -one. Changing the type was supposed to happen, but capitalizing the model messed up my DisplayTemplate. Instead of casting the model to object, I was simply calling Model at the start of the template (basically, that was a shorthand for Model.ToString()), hence the “String object String”-kind of duplicate values on the display template.

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Fixing “An error occurred while updating the entries” while running code-first migrations in MVC 5 app

Update-Database error

This post describes an issue with EF’s code-first migrations, when mapping between DB’s DateTime and C#’s DateTime kind of fails, and results in Update-Database cmdlet failing. It’s more or less a prime example of a situation, where the error itself tells very little about the actual issue, and since debugging code-first migrations is kind of difficult (see the best tips for that here!), it’s cumbersome to investigate.

Symptoms

While running Update-Database in a code-first ASP.NET MVC5 + EF6 -project, you get a following (or similar) error:

An error occurred while updating the entries. See the inner exception for details.

The whole, pretty terrifying error message is the following:

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