File: arrayfinda.js

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mongodb 1%3A2.4.10-5
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// Assorted $elemMatch matching behavior checks.

t = db.jstests_arrayfinda;
t.drop();

// $elemMatch only matches elements within arrays (a descriptive, not a normative test).
t.save( { a:[ { b:1 } ] } );
t.save( { a:{ b:1 } } );

function assertExpectedMatch( cursor ) {
    assert.eq( [ { b:1 } ], cursor.next().a );
    assert( !cursor.hasNext() );
}

assertExpectedMatch( t.find( { a:{ $elemMatch:{ b:{ $gte:1 } } } } ) );
assertExpectedMatch( t.find( { a:{ $elemMatch:{ b:1 } } } ) );

// $elemMatch is not used to perform key matching.  SERVER-6001
t.ensureIndex( { a:1 } );
assertExpectedMatch( t.find( { a:{ $elemMatch:{ b:{ $gte:1 } } } } ).hint( { a:1 } ) );
assertExpectedMatch( t.find( { a:{ $elemMatch:{ b:1 } } } ).hint( { a:1 } ) );