php - Use Doctrine ArrayCollection in symfony custom command -

i use arraycollection in custom symfony command.

but way throwing error

the class 'doctrine\common\collections\arraycollection' not found in chain configured namespaces appbundle\entity

my command

<?php  namespace appbundle\command;  use symfony\bundle\frameworkbundle\command\containerawarecommand; use symfony\component\console\input\inputargument; use symfony\component\console\input\inputinterface; use symfony\component\console\input\inputoption; use symfony\component\console\output\outputinterface; use doctrine\common\collections\arraycollection; use appbundle\entity\gameworld;  class mycommand extends containerawarecommand {     protected function configure()     {         $this             ->setname('get:gw')             ->setdescription('populate gameworld')         ;     }      protected function execute(inputinterface $input, outputinterface $output)     {         $em = $this->getcontainer()->get('doctrine')->getmanager();          $output->writeln('<info>get current gameworlds</info>');         $gws = $em->getrepository('appbundle:gameworld')->findall();          $gws = new arraycollection($gws);          /* rest of command */     } } 

i tried new \doctrine\common\collections\arraycollection($gws);

but error still there.

hope may help.

you tries create instance of arraycollection in gameworld constructor(or somewhere in related entities constructors), did not imported use doctrine\common\collections\arraycollection; call. try check appbundle\entity\gameworld class , related entities occurances of arraycollection , check whether import inside classes.