Create pre filter layer in DbSet

Question

I want to protect my entities using a Field called Deleted to don't allow client really delete any entity. If he tries delete, the only thing is that entity.Deleted = true;

The problem is that everywhere I don't want to include deleted Entities I'll need to use

db.Entities.Where(e => e.Deleted == false).WhateverMethod();

I know I can use a method like this inside my Controller

private IQueryable<Entity> GetNotDeletedEntity() {
        return db.Entities.Where(e => e.Deleted == false);
}

And change every db.Entities.WhateverMethod() for GetNotDeletedEntity().WhateverMethod() , but I seems weird for me.

One note is that GetNotDeletedEntity() returns IQueryable, and db.Entities returns DbSet. This incongruency may be a problem in the future.

I think there's a way to extend DbSet to work like this

db.Entities // include all entities

db.NotDeletedEntities // include only entities e.Deleted == false

Any advice about how to DRY .Where(e => e.Deleted == false) would be great.

Answer 1

Seems like this guy was trying to accomplish something very similar. Take a look at Jon Skeet's explanation here: extension for DbSet