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Spatial data types in Entity Framework and MVC

I was slapped with another funny one with Entity Framework and MVC today. I wanted to access a System.Data.Spatial.DbGeography part of the Entity Framework in one of my views. But I kept getting the error saying that DbGeography was in an assembly that wasn’t referenced.

This was the error, to be precise.

Compiler Error Message: CS0012: The type 'System.Data.Spatial.DbGeography' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

It took me a little while to figure it out since I knew I had that assembly referenced in my project.

The solution was to add this to the ~/Views/Web.config (and any Web.config under any areas that may also utilise this)

<compilation debug="true" targetFramework="4.0">
  <assemblies>
    <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
  </assemblies>
</compilation>

Easy as pie.