Sonata Admin Bundle: show total count of collection on list view

Question

Is there any way to show total count of collection on list view? Imagine that there is a user that can have many links. How can I show total links count on list view?

Answer 1

My answer is similar to Khalid (above) but has some key differences.

If you wrap the collection in a count( $entity->getLinks() ) then this will issue a query which returns every link association.

The downside of this is that if you have 1000s of Links associated, the memory resources required will need to be sufficient for hydrate each entity. (Which can be huge if you have thousands of different entities).

Instead, you should mark your Entities as EXTRA_LAZY and then use the --$entity->getLinks()->count()` method which will not do any hydration, instead it will only issue the COUNT queries.

http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/extra-lazy-associations.html

So do the following:

   /**
     * @ManyToMany(targetEntity="Links", mappedBy="whatever", fetch="EXTRA_LAZY")
     */
    public $links;

Then you can call:

public function getTotalLinks(){
        return $this->getLinks()->count();
    }

And it will be super quick.