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a = db.dbref2a;
b = db.dbref2b;
c = db.dbref2c;
a.drop();
b.drop();
c.drop();
a.save( { name : "eliot" } );
b.save( { num : 1 , link : new DBRef( "dbref2a" , a.findOne()._id ) } );
c.save( { num : 1 , links : [ new DBRef( "dbref2a" , a.findOne()._id ) ] } );
assert.eq( "eliot" , b.findOne().link.fetch().name , "A" );
assert.neq( "el" , b.findOne().link.fetch().name , "B" );
// $elemMatch value
var doc = c.findOne( { links: { $elemMatch: { $ref : "dbref2a", $id : a.findOne()._id } } } );
assert.eq( "eliot" , doc.links[0].fetch().name , "C" );
assert.neq( "el" , doc.links[0].fetch().name , "D" );
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