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Update entity.rst

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@@ -124,17 +124,12 @@ cast into a string and so must have a ``__toString()`` method.
`124`	`124`	`can use anything supported by the`
`125`	`125`	:doc:`PropertyAccessor component</components/property_access/introduction>`
`126`	`126`
`127`		`- Usage sample::`
	`127`	`+ For example, if the translations property is actually an associative array of`
	`128`	`+ objects, each with a name property, then you could do this::`
`128`	`129`
`129`	`130`	`$builder->add('gender', 'entity', array(`
`130`	`131`	`'class' => 'MyBundle:Gender',`
`131`	`132`	`'property' => 'translations[en].name',`
`132`		`- 'query_builder' => function(EntityRepository $er) {`
`133`		`- return $er->createQueryBuilder('g')`
`134`		`- ->join('g.translations', 't', 'WITH', 't.locale = :locale')`
`135`		`- ->orderBy('t.name', 'ASC')`
`136`		`- ->setParameter('locale', 'en');`
`137`		`- },`
`138`	`133`	`));`
`139`	`134`
`140`	`135`	`group_by`

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