Entity Framework Core 6: How to Handle Concurrency Exceptions When Updating Related Entities
Does anyone know how to I'm integrating two systems and I'm working on a project and hit a roadblock. I'm working on a personal project and I'm facing a challenge with handling concurrency exceptions in Entity Framework Core 6 when updating related entities... My application has a `Product` entity that has a navigation property to its `Category`. When a user tries to update a `Product`, I need to ensure that both the `Product` and its associated `Category` are updated atomically, but I'm running into `DbUpdateConcurrencyException` errors when multiple users try to edit the same `Product` simultaneously. I've set up my entities like this: ```csharp public class Product { public int Id { get; set; } public string Name { get; set; } public int CategoryId { get; set; } public Category Category { get; set; } } public class Category { public int Id { get; set; } public string Name { get; set; } } ``` And I'm trying to update a `Product` with the following code: ```csharp public async Task<bool> UpdateProductAsync(Product product) { try { _context.Products.Update(product); await _context.SaveChangesAsync(); return true; } catch (DbUpdateConcurrencyException ex) { // Log the error and handle the concurrency issue var entry = ex.Entries.Single(); var databaseEntry = await entry.GetDatabaseValuesAsync(); entry.OriginalValues.SetValues(databaseEntry); // I want to rethrow or handle it differently, but not sure how. throw; } } ``` When I catch the `DbUpdateConcurrencyException`, I want to reload the `Product` from the database and show the user the current values so they can decide whether to overwrite them or merge changes. However, I'm not sure the best way to do this without introducing more complexity. Currently, the error handling just rethrows the exception, which isn't user-friendly. I've checked the documentation but it's not entirely clear how to elegantly manage this scenario without confusing users. What are the best practices for dealing with concurrency when updating related entities in EF Core? Are there any common patterns or strategies I should follow? Any help would be greatly appreciated! My development environment is macOS. Is there a better approach? How would you solve this? I'm working on a service that needs to handle this. Thanks in advance! I recently upgraded to Csharp LTS. What would be the recommended way to handle this? I've been using Csharp for about a year now. Is there a better approach? This is my first time working with Csharp 3.10. What am I doing wrong?