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t = db.group3;
t.drop();
t.save({a: 1});
t.save({a: 2});
t.save({a: 3});
t.save({a: 4});
cmd = {
initial: {count: 0, sum: 0},
reduce: function(obj, prev) {
prev.count++;
prev.sum += obj.a;
},
finalize: function(obj) {
if (obj.count) {
obj.avg = obj.sum / obj.count;
} else {
obj.avg = 0;
}
},
};
result1 = t.group(cmd);
assert.eq(1, result1.length, "test1");
assert.eq(10, result1[0].sum, "test1");
assert.eq(4, result1[0].count, "test1");
assert.eq(2.5, result1[0].avg, "test1");
cmd['finalize'] = function(obj) {
if (obj.count) {
return obj.sum / obj.count;
} else {
return 0;
}
};
result2 = t.group(cmd);
assert.eq(1, result2.length, "test2");
assert.eq(2.5, result2[0], "test2");
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