diff options
Diffstat (limited to 'jstests/mr3.js')
-rw-r--r-- | jstests/mr3.js | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/jstests/mr3.js b/jstests/mr3.js new file mode 100644 index 00000000000..3ca5ef2b606 --- /dev/null +++ b/jstests/mr3.js @@ -0,0 +1,47 @@ + +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 ); +z = res.convertToSingleObject() + +assert.eq( 3 , z.keySet().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 , { mapparams : [ 2 , 2 ] } ); +z = res.convertToSingleObject() + +assert.eq( 3 , z.keySet().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(); + |