Array in MongoDB

Question

How to get the single array element document with their objecID? For example the collection has an array but the array has own objectid and other properties.

Dc.Collection.FindOne(query); cant get the particular array document if i passed the array element objectid.

shelman · Accepted Answer · 2012-09-21 14:18:32Z

1

Does the array contain embedded documents, as in

{
    ObjectId : // some ID,
    ArrayField : [ 
        {
            ObjectId: // id,
            key: value
        },  
        {
            ObjectId: // id, 
            key: value2
        }
    ]
}

? In that case, you would want to query using dot notation, for instance:

findOne({"ArrayField.key" : value1 })

would match this document. Take a look at the fifth code example on this page:

http://www.mongodb.org/display/DOCS/Dot+Notation+(Reaching+into+Objects)

answered Sep 21, 2012 at 14:18

shelman

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