I am having a few issues with EF Core at the moment. I have some data that I need to delete, and I am struggeling to see how the fluent API works, exactly in regards to the `.OnDelete()` function.

Considering the classic blog/post scenario from [microsofts own websites][1], I wonder what entity, exactly the `OnDelete()` is &#39;targeting&#39; (for the lack of a better word) In some instances it seems to be the blog, in others, the post. Can the Cascade delete be defined from both sides (that the posts are deleted when the parent Blog is) if so i imagine the code should look like this:

`model.Entity&lt;Post&gt;().HasOne(p =&gt; p.Blog).WithMany(b =&gt; b.Posts).HasForeignKey(p =&gt; p.BlogId).OnDelete(DeleteBehavior.Cascade)`

As i understand this is saying &quot;When a Blog is deleted, first delete all posts referencing this blog&quot; meaning the `OnDelete(DeleteBehavior.Cascade)`applies to blog, not to post.

But is this the same then?

`model.Entity&lt;Blog&gt;().HasMany(b =&gt; b.Posts).WithOne(p =&gt; p.Blog).OnDelete(DeleteBehavior.Cascade)`

or does `OnDelete(DeleteBehavior.Cascade)` apply to Post rather than blog?


  [1]: https://docs.microsoft.com/en-us/ef/core/saving/cascade-delete

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Cascade deleting with EF Core