How Can EntityFramework.DynamicFilters Help Filter Soft-Deleted Entities?

Filtering Soft Deleted Entities with Entity Framework

In the realm of data persistence, it is common practice to implement soft deletion, allowing records to be "deleted" without actually being removed from the database. With Entity Framework (EF), achieving this requires customizing the SaveChanges method in the DbContext.

To address the question of filtering out soft-deleted entities when retrieving data, we can leverage a powerful library called EntityFramework.DynamicFilters.

Utilizing EntityFramework.DynamicFilters

EntityFramework.DynamicFilters enables the creation of global filters that are automatically applied when queries are executed, including against navigation properties. To implement filtering for soft-deleted entities, follow these steps:

1. Install the EntityFramework.DynamicFilters NuGet package.
2. In your DbContext's OnModelCreating method, define the filter using the following syntax:

modelBuilder.Filter("IsDeleted", (ISoftDelete d) => d.IsDeleted, false);

This filter will inject a WHERE clause into any query targeting entities that implement the ISoftDelete interface and check if IsDeleted is true. By setting the filterEnabled parameter to false, the filter will only be applied to retrieval operations.

Result

When executing a query on an entity type marked with the ISoftDelete interface, EntityFramework.DynamicFilters will automatically filter out any entities where IsDeleted is true. This allows you to retrieve data without manually specifying additional filtering criteria.

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