c# - Fluent API not cascading on delete in a one-to-one relationship -

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i have 2 classes: 

public class student {     public long studentid { get; set; }     public studentdetails details { get; set; } }  public class studentdetails {     public long studentdetailsid { get; set; }     public student student{ get; set; }     //other properties }

one student contains 1 studentdetails. studentdetails can not exist without corresponding student.

with these mappings: 

    public studentmapping()     {         this.totable("student");          this.haskey(x => x.studentid);          this.hasrequired(x => x.details)             .withrequireddependent(x => x.student)             .willcascadeondelete(true);     }      public studentdetailsmapping()     {         this.totable("studentdetails");          this.haskey(x => x.studentdetailsid);          this.hasrequired(x => x.student);     }

however, when go database in sql management studio, , following: delete students studentid == 1, student row gets deleted, delete not cascade studentdetails row. what's going wrong? trying studentdetails row deleted when delete it's student parent object.

have checked this , this article on msdn?

as can see, model not real one-on-one relationship because 2 entities have here doesn't share same primary key.

when model relationship are, in fact, creating one-to-many table structure in database: how can prevent studentdetailsid not in use student? mean, can enforce business rule, strictly db speaking there no rule.

if want enforce cascade delete ef in one-to-one, need make this:

public class student {     public long studentid { get; set; }     public studentdetails details { get; set; } }      public class studentdetails     {         public long studentid { get; set; }         public student student{ get; set; }         //other properties     }  public studentmapping()     {         this.totable("student");          this.haskey(x => x.studentid);          this.hasrequired(x => x.details)             .withrequireddependent(x => x.student)             .willcascadeondelete(true);     }      public studentdetailsmapping()     {         this.totable("studentdetails");          this.haskey(x => x.studentid);          this.hasrequired(x => x.student);     }

hope helps :)


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