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Editorial Team
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Asked: 2026-06-10T06:27:55+00:00

Following on from this question here: Entity Framework Reverse Engineer using Power Tools –

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Following on from this question here:Entity Framework Reverse Engineer using Power Tools – No Primary Keys

I’ve reverse engineered a database using Entity Framework Power Tools Beta 2.
This has created a large number of POCO’s and a mappings folder with the entity mappings.

When I attempt to create a controller using the Add Controller Dialog I get the following message box come up:

Unable to retrieve metadata for cruise model. One or more Validation errors were detected during model generation:
\tSystem.Data.Entity.EmdEntityTypes:: cruise table has no key defined. Define the key for this EntityType.

This repeats many times for all the related tables to the original one for which I was trying to create a controller.

The Controller itself is never created and on pressing OK I’m returned to the Add Controller Dialog.

The model in question definitley has a primary key defined in it’s mapping file:

// Primary Key
this.HasKey(t => t.cruise_ID);

What am I doing wrong?

How does the controller find the mapping classes?

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1 Answer

  1. Editorial Team

    I’ve been able to replicate the error your receive, and it’s related to trying to create a controller for the Model itself, rather than for the entity type.

    The MVC scaffolding is designed to target an entity, then the related context – are you sure you’re selecting the right items in the drop down?

    enter image description here

    In This image:

    • Your model drop down (Mine shows A (MVCExamples.Models)) should refer to what I assume is your cruise entity.
    • Your Data Context should be the DbContext that gets created (Mine shows Entities (MVCExamples.Models))
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