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// SERVER-6361 Disallow exclusions in $project for 2.2
// load the test utilities
load('jstests/aggregation/extras/utils.js');
c = db.c;
c.drop();
c.insert({a: 2, nested: {_id: 2, other: 2}});
assertErrorCode(c, {$project: {a: 0}}, 16406);
// excluding top-level _id is still allowed
res = c.aggregate({$project: {_id: 0, a: 1}});
assert.eq(res.toArray()[0], {a: 2});
// excluding nested _id is not
assertErrorCode(c, {$project: {'nested._id': 0}}, 16406);
// nested _id is not automatically included
res = c.aggregate({$project: {_id: 0, 'nested.other': 1}});
assert.eq(res.toArray()[0], {nested: {other: 2}});
// not including anything is an error
assertErrorCode(c, {$project: {}}, 16403);
// even if you exclude _id
assertErrorCode(c, {$project: {'_id': 0}}, 16403);
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