I have a Product admin class. The Product entity has a many-to-one relationship with a Category entity, i.e. a product is associated with a category.
In the admin "list" page for products, I need to sort by the category name (alphabetically) that each product is associated with.
Setting the default field to sort by is easy if the field is on the entity itself (see Sonata admin bundle order for how to do this). But I cannot figure out how to sort by a field in a related table.
Any help is appreciated.