> db.presentations.find( { "attendees._id" : ObjectId("4e034b4363dca237ec000003") } );
{ "_id" : ObjectId("4e0345cb52c304b4ea000009"), "attendees" : [
	{
		"_id" : ObjectId("4e034b4363dca237ec000003"),
		"name" : "asas",
		"email" : "asass"
	},
	{
		"_id" : ObjectId("4e0355f248cdf64bf4000005"),
		"name" : "asas",
		"email" : "asasas"
	},
	{
		"_id" : ObjectId("4e035659c9f0d750f4000007"),
		"name" : "vinicius",
		"email" : "vcamaral@gmail.com"
	},
	{
		"_id" : ObjectId("4e0356731b669e52f4000005"),
		"name" : "vinicius2",
		"email" : "vcamaral@gmail.com"
	},
	{
		"_id" : ObjectId("4e035689622ab053f4000006"),
		"name" : "vinicius2",
		"email" : "vcamaral@gmail.com"
	},
	{
		"_id" : ObjectId("4e0356d477bfe956f4000007"),
		"name" : "sasasas",
		"email" : "vcamaral@gmail.com"
	}
], "slides" : 3 }
>