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POProblems creating a Foreign-Key relationship on Entity Framework
 

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  1. POProblems creating a Foreign-Key relationship on Entity Framework
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    <p>i'm having trouble configuring a foreign key relationship in my Entity Framework fluent Api:</p> <p>Here is the head of the report:</p> <pre><code> public class Testata { public Testata() { Details = new List&lt;Dettaglio&gt;(); } public virtual int IDTEST { get; set; } public virtual string Value { get; set; } public virtual int IDDETAIL { get; set; } public virtual string IDTESTALT { get; set; } public virtual byte[] BLOB { get; set; } public virtual IList&lt;Dettaglio&gt; Details { get; set; } } </code></pre> <p>This is the report's detail</p> <pre><code>public class Dettaglio { public virtual int IDDETAIL { get; set; } public virtual int IDTEST { get; set; } public virtual string DSDETAIL { get; set; } public virtual Testata TEST_TABLE { get; set; } } </code></pre> <p>And this is my fluent API definition of both. Head of the report:</p> <pre><code>public TEST_TABLEMap() { // Primary Key this.HasKey(t =&gt; t.IDTEST) .Property(t =&gt; t.IDTEST) .IsRequired() .HasColumnType("Int") .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity) .HasColumnName("IDTEST"); // Table &amp; Column Mappings this.ToTable("TEST_TABLE"); this.Property(t =&gt; t.Value).HasColumnName("DSVALUETEST"); this.Property(t =&gt; t.IDTESTALT).HasColumnName("IDTESTALT"); this.Property(t =&gt; t.BLOB).HasColumnName("BLOB"); } </code></pre> <p>Detail of the report:</p> <pre><code>public TEST_DETAILMap() { // Primary Key this.HasKey(t =&gt; t.DSDETAIL); // Properties this.Property(t =&gt; t.DSDETAIL); // Table &amp; Column Mappings this.ToTable("TEST_DETAIL"); this.Property(t =&gt; t.IDDETAIL).HasColumnName("IDDETAIL"); // this.Property(t =&gt; t.IDTEST).HasColumnName("IDTEST"); this.Property(t =&gt; t.DSDETAIL).HasColumnName("DSDETAIL"); // Relationships this.HasOptional(t =&gt; t.TEST_TABLE) .WithMany(t =&gt; t.Details) .HasForeignKey(d =&gt; d.IDDETAIL).WillCascadeOnDelete(true); } </code></pre> <p>On execution i always get this error</p> <blockquote> <p>System.Data.Entity.Edm.EdmAssociationType: : Multiplicity conflicts with the referential constraint in Role 'Dettaglio_TEST_TABLE_Target' in relationship 'Dettaglio_TEST_TABLE'. Because all of the properties in the Dependent Role are non-nullable, multiplicity of the Principal Role must be '1'.</p> </blockquote> <p>Which, i guess, means i'm failing something at foreign key definition, but i don't really know where to look at. Any help/hint is much appreciated.</p>
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