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t = db.mr3;
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( n , x ){
x = x || 1;
this.tags.forEach(
function(z){
for ( var i=0; i<x; i++ )
emit( z , { count : n || 1 } );
}
);
};
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 : "mr3_out" } );
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 , { out : "mr3_out" , mapparams : [ 2 , 2 ] } );
z = res.convertToSingleObject()
assert.eq( 3 , Object.keySet( z ).length , "B1" );
assert.eq( 8 , z.a.count , "B2" );
assert.eq( 12 , z.b.count , "B3" );
assert.eq( 12 , z.c.count , "B4" );
res.drop();
// -- just some random tests
realm = m;
m = function(){
emit( this._id , 1 );
}
res = t.mapReduce( m , r , { out : "mr3_out" } );
res.drop();
m = function(){
emit( this._id , this.xzz.a );
}
before = db.getCollectionNames().length;
assert.throws( function(){ t.mapReduce( m , r , { out : "mr3_out" } ); } );
assert.eq( before , db.getCollectionNames().length , "after throw crap" );
m = realm;
r = function( k , v ){
return v.x.x.x;
}
before = db.getCollectionNames().length;
assert.throws( function(){ t.mapReduce( m , r , "mr3_out" ) } )
assert.eq( before , db.getCollectionNames().length , "after throw crap" );
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