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/*
* SERVER-6127 : $project uasserts if an expected nested field has a non object parent in a document
*
* This test validates the SERVER-6127 ticket. Return undefined when retrieving a field along a
* path, when the subpath does not exist (this is what happens when a field does not exist and
* there is no path). Previous it would uassert causing the aggregation to end.
*/
/*
* 1) Clear and create testing db
* 2) Run an aggregation that simply projects a two fields, one with a sub path one without
* 3) Assert that the result is what we expected
*/
// Clear db
db.s6127.drop();
// Populate db
db.s6127.save({a: 1});
db.s6127.save({foo: 2});
db.s6127.save({foo: {bar: 3}});
// Aggregate checking the field foo and the path foo.bar
var s6127 = db.s6127.aggregate({$project: {_id: 0, 'foo.bar': 1, field: "$foo", path: "$foo.bar"}});
/*
* The first document should contain nothing as neither field exists, the second document should
* contain only field as it has a value in foo, but foo does not have a field bar so it cannot walk
* that path, the third document should have both the field and path as foo is an object which has
* a field bar
*/
var s6127result = [
{},
{field: 2},
{
foo: {bar: 3},
field: {bar: 3},
path: 3
}
];
// Assert
assert.eq(s6127.toArray(), s6127result, 's6127 failed');
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