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

Show field it is quite easy, there is solution for sorting by this virtual field.

1. Entity/Some.php more about count here Extra Lazy Associations

   public function getCommentsCount()
   {
       return $this->getComments()->count();
   }
   

2. SomeAdmin.php override createQuery and configure list field

   public function createQuery($context = 'list')
   {
       $query = parent::createQuery($context);
       if ('list' === $context) {
           $rootAlias = $query->getRootAliases()[0];
           //...
           $parameters = $this->getFilterParameters();
           if ('getCommentsCount' === $parameters['_sort_by']) {
               $query
                   ->leftJoin($rootAlias.'. comments', 'cm')
                   ->groupBy($rootAlias.'.id')
                   ->orderBy('COUNT(cm.id)', $parameters['_sort_order'])
               ;
           }
           //...
       }
       return $query;
   }
   
   /**
    * @param ListMapper $listMapper
    */
   protected function configureListFields(ListMapper $listMapper)
   {
       $listMapper
           ->add('id')
           //...
           ->add(
               'getCommentsCount',
               null,
               [
                   'sortable' => true,
                   'sort_field_mapping' => ['fieldName' => 'id'],
                   'sort_parent_association_mappings' => [],
               ]
           )
        //....
    }
   

3. service.yaml add "simple" paginator (count does not work correctly)

   tags:
       - { name: sonata.admin, pager_type: "simple", ...
   

Reasons:

• subquery in orm join is not allowed
• subquery in orm orderBy is not allowed
• HIDDEN field does not work

\Sonata\DoctrineORMAdminBundle\Datagrid\ProxyQuery::getFixedQueryBuilder (// for SELECT DISTINCT, ORDER BY expressions must appear in idxSelect list)