> db.test.findOne()
{
	"_id" : ObjectId("54b4fa2618c1e7c4365f43dc"),
	"family" : "Smith",
	"children" : [
		{
			"child_name" : "John"
		},
		{
			"child_name" : "Anna"
		}
	]
}


------------------------------------------------------------------------------------------------------------------------

> db.test.find({"family" : "Smith"},{"children" : 1, "family" : 0,"_id":0})
error: {
	"$err" : "You cannot currently mix including and excluding fields. Contact us if this is an issue.",
	"code" : 10053
}


> db.test.find({"family" : "Smith"},{"children" : 0,  "family" : 1 ,"_id":0})
error: {
	"$err" : "You cannot currently mix including and excluding fields. Contact us if this is an issue.",
	"code" : 10053
}
>


> db.test.find({"family" : "Smith"},{"children" : 0,  "family" : 1 ,"_id":1})
error: {
	"$err" : "You cannot currently mix including and excluding fields. Contact us if this is an issue.",
	"code" : 10053
}
>

> db.test.find({"family" : "Smith"},{"children" : 0,  "family" : 0 ,"_id":1})
error: {
	"$err" : "You cannot currently mix including and excluding fields. Contact us if this is an issue.",
	"code" : 10053
}
> 


------------------------------------------------------------------------------------------------------------------------

> db.test.find({"family" : "Smith"},{"children" : 1,  "family" : 1 ,"_id":0})
{ "family" : "Smith", "children" : [  {  "child_name" : "John" },  {  "child_name" : "Anna" } ] }
>