File: index5.js

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// index5.js - test reverse direction index

function validate() {
    assert.eq( 2, t.find().count() );
    f = t.find().sort( { a: 1 } );
    assert.eq( 2, t.count() );
    assert.eq( 1, f[ 0 ].a );
    assert.eq( 2, f[ 1 ].a );
    r = t.find().sort( { a: -1 } );
    assert.eq( 2, r.count() );
    assert.eq( 2, r[ 0 ].a );
    assert.eq( 1, r[ 1 ].a );
}

t = db.index5;
t.drop();

t.save( { a: 1 } );
t.save( { a: 2 } );

validate();

t.ensureIndex( { a: -1 } );
validate();