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t = db.mr4;
t.drop();
t.save( { x : 1 , tags : [ "a" , "b" ] } );
t.save( { x : 2 , tags : [ "b" , "c" ] } );
t.save( { x : 3 , tags : [ "c" , "a" ] } );
t.save( { x : 4 , tags : [ "b" , "c" ] } );
m = function(){
this.tags.forEach(
function(z){
emit( z , { count : xx } );
}
);
};
r = function( key , values ){
var total = 0;
for ( var i=0; i<values.length; i++ ){
total += values[i].count;
}
return { count : total };
};
res = t.mapReduce( m , r , { out : "mr4_out" , scope : { xx : 1 } } );
z = res.convertToSingleObject()
assert.eq( 3 , Object.keySet( z ).length , "A1" );
assert.eq( 2 , z.a.count , "A2" );
assert.eq( 3 , z.b.count , "A3" );
assert.eq( 3 , z.c.count , "A4" );
res.drop();
res = t.mapReduce( m , r , { scope : { xx : 2 } , out : "mr4_out" } );
z = res.convertToSingleObject()
assert.eq( 3 , Object.keySet( z ).length , "A1" );
assert.eq( 4 , z.a.count , "A2" );
assert.eq( 6 , z.b.count , "A3" );
assert.eq( 6 , z.c.count , "A4" );
res.drop();
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