Querys advanced multiple similar documents

[Alejo Mext]

I need to make a query that a change is repeated in several documents. But I just want to leave me one of those documents. But I can not do 'FindOne', why should I bring more documents with those same characteristics. As such querys ago?

That means, I have this in the collection

{ x : ObjectId(1), y : [ ObjectId(2) ], z : "My string ...", w : ISODate("2013-09-19T16:45:13.573Z") }
{ x : ObjectId(2), y : [ ObjectId(3), ObjectId(1) ], z : "My string", w : ISODate("2013-09-18T00:57:41.204Z")}
{ x : ObjectId(3), y : [ ObjectId(4), ObjectId(2) ], z : "My string", w :ISODate("2013-09-18T00:57:41.204Z") }
{ x : ObjectId(4), y : [ ObjectId(3) ], z : "My string", w : ISODate("2013-09-19T16:45:13.573Z") }
{ x : ObjectId(1), y : [ ObjectId(2), ObjectId(3) ], z : "My string", w : ISODate("2013-09-19T16:45:13.573Z") }
{ x : ObjectId(4), y : [ ObjectId(3) ], z : "My string", w : ISODate("2013-09-19T16:45:13.573Z") }
{ x : ObjectId(1), y : [ ObjectId(2), ObjectId(3) ], z : "My string", w : ISODate("2013-09-19T16:45:13.573Z") }

Now I want to go so

{ x : ObjectId(1), y : [ ObjectId(2) ], z : "My string ...", w : ISODate("2013-09-19T16:45:13.573Z") }
{ x : ObjectId(2), y : [ ObjectId(3), ObjectId(1) ], z : "My string", w : ISODate("2013-09-18T00:57:41.204Z")}
{ x : ObjectId(3), y : [ ObjectId(4), ObjectId(2) ], z : "My string", w :ISODate("2013-09-18T00:57:41.204Z") }
{ x : ObjectId(4), y : [ ObjectId(3) ], z : "My string", w : ISODate("2013-09-19T16:45:13.573Z") }

Data not know

• The content of the string --> z
• The Id --> x
• With the date is organized or making a sort

Data if

• I have an Id corresponding to y
• And I have a maximum number of documents or a limit is 100

Anyone know how that kind of querys????? Or solve this problem????

Remember that the collection has been enlarged and at all times should give that. the query!