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Show correct code sample for optional one-to-many #4357

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May 23, 2023
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Show correct code sample for optional one-to-many #4357

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7 changes: 4 additions & 3 deletions entity-framework/core/modeling/relationships/one-to-many.md
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Original file line number Diff line number Diff line change
Expand Up @@ -102,17 +102,18 @@ Neither of these options is better than the other; they both result in exactly t
public class Blog
{
public int Id { get; set; }
public ICollection<Post> Posts { get; } = new List<Post>(); // Collection navigation containing dependents
public ICollection<Post> Posts { get; } = new List<Post>(); // Collection navigation containing dependents
}

// Dependent (child)
public class Post
{
public int Id { get; set; }
public Blog? Blog { get; set; } // Optional reference navigation to principal
public int? BlogId { get; set; } // Optional foreign key property
public Blog? Blog { get; set; } // Optional reference navigation to principal
}
-->
[!code-csharp[OneToManyOptionalShadow](../../../../samples/core/Modeling/Relationships/OneToMany.cs?name=OneToManyOptionalShadow)]
[!code-csharp[OneToManyOptional](../../../../samples/core/Modeling/Relationships/OneToMany.cs?name=OneToManyOptional)]

This is the same as the previous example, except that the foreign key property and navigation to the principal are now nullable. This makes the relationship "optional" because a dependent (`Post`) can exist _without_ being related to any principal (`Blog`).

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