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featuresymfony#3124 Add note about the property attribute (Property Accessor) (raziel057)

This PR was submitted for the 2.2 branch but it was merged into the 2.3 branch instead (closessymfony#3124).Discussion----------Add note about the property attribute (Property Accessor)I think we must document the fact that propety is a path which is evaluted by the PropertyAccessor component.Commits-------46f1b8b Update entity.rst7496e68 Update entity.rstc097f9b Update entity.rst7d65fed Update entity.rst6af779d Add note about the property attribute (Property Accessor)

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reference/forms/types
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`‎reference/forms/types/entity.rst`

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`@@ -118,6 +118,20 @@ This is the property that should be used for displaying the entities`
`118`	`118`	`as text in the HTML element. If left blank, the entity object will be`
`119`	`119`	cast into a string and so must have a ``__toString()`` method.
`120`	`120`
	`121`	`+..note::`
	`122`	`+`
	`123`	+ The ``property`` option is the property path used to display the option. So you
	`124`	`+ can use anything supported by the`
	`125`	+:doc:`PropertyAccessor component</components/property_access/introduction>`
	`126`	`+`
	`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::`
	`129`	`+`
	`130`	`+ $builder->add('gender', 'entity', array(`
	`131`	`+ 'class' => 'MyBundle:Gender',`
	`132`	`+ 'property' => 'translations[en].name',`
	`133`	`+ ));`
	`134`	`+`
`121`	`135`	`group_by`
`122`	`136`	`~~~~~~~~`
`123`	`137`

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