mongo/jstests/core/query/pull/pullall.js

let t = db.jstests_pullall;
t.drop();

t.save({a: [1, 2, 3]});
t.update({}, {$pullAll: {a: [3]}});
assert.eq([1, 2], t.findOne().a);
t.update({}, {$pullAll: {a: [3]}});
assert.eq([1, 2], t.findOne().a);

t.drop();
t.save({a: [1, 2, 3]});
t.update({}, {$pullAll: {a: [2, 3]}});
assert.eq([1], t.findOne().a);
t.update({}, {$pullAll: {a: []}});
assert.eq([1], t.findOne().a);
t.update({}, {$pullAll: {a: [1, 5]}});
assert.eq([], t.findOne().a);

// SERVER-6047: $pullAll creates empty nested docs for dotted fields
// that don't exist.
t.drop();
t.save({m: 1});
t.update({m: 1}, {$pullAll: {"a.b": [1]}});
assert("a" in t.findOne() == false);
// Non-obvious bit: the implementation of non-in-place update
// might do different things depending on whether the "new" field
// comes before or after existing fields in the document.
// So for now it's worth testing that too. Sorry, future; blame the past.
t.update({m: 1}, {$pullAll: {"x.y": [1]}});
assert("z" in t.findOne() == false);
// End SERVER-6047