File: mr_sort.js

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t = db.mr_sort;
t.drop()

t.ensureIndex( { x : 1 } )

t.insert( { x : 1 } )
t.insert( { x : 10 } )
t.insert( { x : 2 } )
t.insert( { x : 9 } )
t.insert( { x : 3 } )
t.insert( { x : 8 } )
t.insert( { x : 4 } )
t.insert( { x : 7 } )
t.insert( { x : 5 } )
t.insert( { x : 6 } )

m = function(){
    emit( "a" , this.x )
}

r = function( k , v ){
    return Array.sum( v )
}


res = t.mapReduce( m , r , "mr_sort_out " );
x = res.convertToSingleObject();
res.drop();
assert.eq( { "a" : 55 } , x , "A1" )

res = t.mapReduce( m , r , { out : "mr_sort_out" , query : { x : { $lt : 3 } } } )
x = res.convertToSingleObject();
res.drop();
assert.eq( { "a" : 3 } , x , "A2" )

res = t.mapReduce( m , r , { out : "mr_sort_out" , sort : { x : 1 } , limit : 2 } );
x = res.convertToSingleObject();
res.drop();
assert.eq( { "a" : 3 } , x , "A3" )