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Update entity.rst

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@@ -102,17 +102,12 @@ cast into a string and so must have a ``__toString()`` method.
`102`	`102`	`can use anything supported by the`
`103`	`103`	:doc:`PropertyAccessor component</components/property_access/introduction>`
`104`	`104`
`105`		`- Usage sample::`
	`105`	`+ For example, if the translations property is actually an associative array of`
	`106`	`+ objects, each with a name property, then you could do this::`
`106`	`107`
`107`	`108`	`$builder->add('gender', 'entity', array(`
`108`	`109`	`'class' => 'MyBundle:Gender',`
`109`	`110`	`'property' => 'translations[en].name',`
`110`		`- 'query_builder' => function(EntityRepository $er) {`
`111`		`- return $er->createQueryBuilder('g')`
`112`		`- ->join('g.translations', 't', 'WITH', 't.locale = :locale')`
`113`		`- ->orderBy('t.name', 'ASC')`
`114`		`- ->setParameter('locale', 'en');`
`115`		`- },`
`116`	`111`	`));`
`117`	`112`
`118`	`113`	`group_by`

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