jstests/aggregation/bugs/server6181.js

// SERVER-6181 Correctly support an expression for _id

c = db.c;
c.drop();

c.save( { a:2 } );

res = c.aggregate( { $project:{ _id:'$a' } } )
assert.eq(res.toArray(), [{_id:2}])

res = c.aggregate( { $project:{ _id:{$add: [1, '$a']} } } )
assert.eq(res.toArray(), [{_id:3}])
Rewrite ExpressionObject The main difference between this version and the old is that the following three $pipelines will produce the same output (SERVER-6468): {'a.b': 1} // classic inclusion {a: {b: 1} // nested inclusion {'a.b': '$a.b'} // dotted FieldPathExpression {a: {b: '$a.b'} // nested FieldPathExpression Additionally support for exclusion of fields other than _id has been removed for 2.2 (SERVER-6361) Other related bugs: SERVER-6177 better error for {a:1, 'a.b':1} SERVER-6181 support for computed _id SERVER-6184 support {'a.b': 1, a:{c:1}} in either order Remaining TODOs: Re-enable the isSimple() method See if this can be used more directly by $group to support nested fields (SERVER-6198) Disabled test for SERVER-5369 because it depends on ability to exclude arbitrary fields. 2012-07-14 15:04:12 -04:00			`// SERVER-6181 Correctly support an expression for _id`

			`c = db.c;`
			`c.drop();`

			`c.save( { a:2 } );`

			`res = c.aggregate( { $project:{ _id:'$a' } } )`
SERVER-10165 aggregate() shell helper now returns a cursor The actual change is in src/mongo/shell/collection.js with the remaining changes to adjust tests to the new api. The "ideal" arguments are now an array of pipeline ops and an optional object with extra top-level options for the command (such as {explain: true}. For backwards compatibility, we still support the varargs style where each argument is a pipeline stage, but there is no way to specify extra parameters in this mode. 2013-10-08 13:29:04 -04:00			`assert.eq(res.toArray(), [{_id:2}])`
Rewrite ExpressionObject The main difference between this version and the old is that the following three $pipelines will produce the same output (SERVER-6468): {'a.b': 1} // classic inclusion {a: {b: 1} // nested inclusion {'a.b': '$a.b'} // dotted FieldPathExpression {a: {b: '$a.b'} // nested FieldPathExpression Additionally support for exclusion of fields other than _id has been removed for 2.2 (SERVER-6361) Other related bugs: SERVER-6177 better error for {a:1, 'a.b':1} SERVER-6181 support for computed _id SERVER-6184 support {'a.b': 1, a:{c:1}} in either order Remaining TODOs: Re-enable the isSimple() method See if this can be used more directly by $group to support nested fields (SERVER-6198) Disabled test for SERVER-5369 because it depends on ability to exclude arbitrary fields. 2012-07-14 15:04:12 -04:00
			`res = c.aggregate( { $project:{ _id:{$add: [1, '$a']} } } )`
SERVER-10165 aggregate() shell helper now returns a cursor The actual change is in src/mongo/shell/collection.js with the remaining changes to adjust tests to the new api. The "ideal" arguments are now an array of pipeline ops and an optional object with extra top-level options for the command (such as {explain: true}. For backwards compatibility, we still support the varargs style where each argument is a pipeline stage, but there is no way to specify extra parameters in this mode. 2013-10-08 13:29:04 -04:00			`assert.eq(res.toArray(), [{_id:3}])`