mirror of https://github.com/mongodb/mongo
54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
// Cannot implicitly shard accessed collections because of following errmsg: A single
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// update/delete on a sharded collection must contain an exact match on _id or contain the shard
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// key.
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// @tags: [assumes_unsharded_collection, requires_fastcount]
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t = db.find_and_modify4;
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t.drop();
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// this is the best way to build auto-increment
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function getNextVal(counterName) {
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var ret = t.findAndModify({
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query: {_id: counterName},
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update: {$inc: {val: 1}},
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upsert: true,
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'new': true,
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});
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return ret;
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}
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assert.eq(getNextVal("a"), {_id: "a", val: 1});
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assert.eq(getNextVal("a"), {_id: "a", val: 2});
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assert.eq(getNextVal("a"), {_id: "a", val: 3});
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assert.eq(getNextVal("z"), {_id: "z", val: 1});
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assert.eq(getNextVal("z"), {_id: "z", val: 2});
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assert.eq(getNextVal("a"), {_id: "a", val: 4});
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t.drop();
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function helper(upsert) {
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return t.findAndModify({
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query: {_id: "asdf"},
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update: {$inc: {val: 1}},
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upsert: upsert,
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'new': false // the default
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});
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}
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// upsert:false so nothing there before and after
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assert.eq(helper(false), null);
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assert.eq(t.count(), 0);
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// upsert:true so nothing there before; something there after
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assert.eq(helper(true), null);
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assert.eq(t.count(), 1);
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assert.eq(helper(true), {_id: 'asdf', val: 1});
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assert.eq(helper(false), {_id: 'asdf', val: 2}); // upsert only matters when obj doesn't exist
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assert.eq(helper(true), {_id: 'asdf', val: 3});
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// _id created if not specified
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var out = t.findAndModify({query: {a: 1}, update: {$set: {b: 2}}, upsert: true, 'new': true});
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assert.neq(out._id, undefined);
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assert.eq(out.a, 1);
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assert.eq(out.b, 2);
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