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t = db.find_and_modify4;
t.drop();
// this is the best way to build auto-increment
function getNextVal(counterName){
var ret = t.findAndModify({
query: {_id: counterName},
update: {$inc: {val: 1}},
upsert: true,
'new': true,
});
return ret.val;
}
assert.eq(getNextVal("a"), 1);
assert.eq(getNextVal("a"), 2);
assert.eq(getNextVal("a"), 3);
assert.eq(getNextVal("z"), 1);
assert.eq(getNextVal("z"), 2);
assert.eq(getNextVal("a"), 4);
t.drop();
function helper(upsert){
return t.findAndModify({
query: {_id: "asdf"},
update: {$inc: {val: 1}},
upsert: upsert,
'new': false // the default
});
}
// upsert:false so nothing there before and after
assert.eq(helper(false), null);
assert.eq(t.count(), 0);
// upsert:false so nothing there before; something there after
assert.eq(helper(true), null);
assert.eq(t.count(), 1);
assert.eq(helper(true), {_id: 'asdf', val: 1});
assert.eq(helper(false), {_id: 'asdf', val: 2}); // upsert only matters when obj doesn't exist
assert.eq(helper(true), {_id: 'asdf', val: 3});
// _id created if not specified
var out = t.findAndModify({
query: {a:1},
update: {$set: {b: 2}},
upsert: true,
'new': true
});
assert.neq(out._id, undefined);
assert.eq(out.a, 1);
assert.eq(out.b, 2);
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