Скачать или смотреть How to Implement Cascade Delete in EF Core: A Guide for Developers

Learn how to effectively delete related entities in Entity Framework Core using `cascade delete` functionality for smooth data management.
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This video is based on the question https://stackoverflow.com/q/64196786/ asked by the user 'Giga Meta' ( https://stackoverflow.com/u/12351801/ ) and on the answer https://stackoverflow.com/a/64196840/ provided by the user 'Tanveer Badar' ( https://stackoverflow.com/u/59081/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Cascade Delete in Entity Framework Core

When working with Entity Framework Core (EF Core), you may encounter situations where deleting an entity should also remove its related entities. This is often referred to as a cascade delete. It's essential to understand how to set this up to maintain the integrity of your data model.

In this post, we will discuss how to implement cascade deletes within your EF Core model, taking a closer look at a common scenario involving entities like Company, Recruiter, and Post.

The Problem: Deleting Related Entities

You might be trying to delete a Post entity and expecting all associated entities—like its related Company and Recruiter—to be deleted as well. However, EF Core does not automatically handle this unless properly configured, which can lead to confusion when you only see one deletion (the Post itself) occurring.

Setting Up the Model

Let's first revisit the model structure. Here’s what your entities look like:

[[See Video to Reveal this Text or Code Snippet]]

Configuring Cascade Delete Behavior

To ensure that related entities are deleted correctly, you need to configure your relationships using Fluent API in the OnModelCreating method:

[[See Video to Reveal this Text or Code Snippet]]

In the above code, the configuration:

Defines the relationship between Post and Company.

Enables cascade delete with OnDelete(DeleteBehavior.Cascade).

Making the Delete Call

When you want to delete a Post and ensure the related Company and Recruiter are also removed, update your deletion logic. However, the most effective approach is to delete the Company itself, which will then cascade the deletion to the Post and Recruiter.

Here’s the adjusted deletion logic for the Company:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Implementing cascade deletes in EF Core is crucial for maintaining your data integrity and ensuring that related entities are appropriately removed. By setting up the relationship configurations within your model correctly and choosing the right entity to delete, you can simplify your data management tasks.

If you follow the breakdown provided here, you should seamlessly manage related deletions in your EF Core applications.

Feel free to reach out if you have any questions or need further clarification on working with EF Core!