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PO"EntityType has no key defined" exception although key is defined with HasKey
 

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  1. PO"EntityType has no key defined" exception although key is defined with HasKey
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    <p>Using EF 5 (reverse engineered code first), my model was working fine until it suddenly stopped.</p> <blockquote> <p>\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'ProjectsDate' has no key defined. Define the key for this EntityType.</p> <p>\tSystem.Data.Entity.Edm.EdmEntityType: : EntityType 'ProjectsRisk' has no key defined. Define the key for this EntityType.</p> </blockquote> <p>I define a key using fluent API rather than attributes, here is my ProjectsDates classes.</p> <blockquote> <pre><code>public partial class ProjectsDate { public string OSProjectCode { get; set; } public Nullable&lt;System.DateTime&gt; TargetStart { get; set; } public Nullable&lt;System.DateTime&gt; EndDateOriginal { get; set; } public Nullable&lt;System.DateTime&gt; EndDateChangeControl { get; set; } public Nullable&lt;System.DateTime&gt; EndDateActual { get; set; } public Nullable&lt;System.DateTime&gt; GoLiveAgreed { get; set; } public Nullable&lt;System.DateTime&gt; GoLiveActual { get; set; } public virtual Project Project { get; set; } } </code></pre> </blockquote> <pre><code>public class ProjectsDateMap : EntityTypeConfiguration&lt;ProjectsDate&gt; { public ProjectsDateMap() { // Primary Key this.HasKey(t =&gt; t.OSProjectCode); // Properties this.Property(t =&gt; t.OSProjectCode) .IsRequired() .HasMaxLength(10); // Table &amp; Column Mappings this.ToTable("ProjectsDates"); this.Property(t =&gt; t.OSProjectCode).HasColumnName("OSProjectCode"); this.Property(t =&gt; t.TargetStart).HasColumnName("TargetStart"); this.Property(t =&gt; t.EndDateOriginal).HasColumnName("EndDateOriginal"); this.Property(t =&gt; t.EndDateChangeControl).HasColumnName("EndDateChangeControl"); this.Property(t =&gt; t.EndDateActual).HasColumnName("EndDateActual"); this.Property(t =&gt; t.GoLiveAgreed).HasColumnName("GoLiveAgreed"); this.Property(t =&gt; t.GoLiveActual).HasColumnName("GoLiveActual"); // Relationships this.HasRequired(t =&gt; t.Project) .WithOptional(t =&gt; t.ProjectsDate); } } </code></pre> <p>Why doesn't EF see my fluent API mapping?</p>
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    1. This table or related slice is empty.
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    1. USSlauma
    1. USMalkin
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. VO
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      1. PO"EntityType has no key defined" exception although key is defined with HasKey
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. PO"EntityType has no key defined" exception although key is defined with HasKey
      1. This table or related slice is empty.
      1. VTUpMod
    1. COMaybe you didn't add an instance of `ProjectsDateMap` to `modelBuilder.Configurations` in `OnModelCreating`?
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      1. PO"EntityType has no key defined" exception although key is defined with HasKey
      1. USSlauma
    2. COJust double checked, it is in OnModelCreating, cheers anyway
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      1. PO"EntityType has no key defined" exception although key is defined with HasKey
      1. USMalkin
    3. COWhat a pity, it had been such a simple explanation and fix :) Did you check in the debugger if the `HasKey` line is actually passed?
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      1. PO"EntityType has no key defined" exception although key is defined with HasKey
      1. USSlauma
 

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