The positional field name is not set when matching a negated expession (eg $ne, $nin, $not). So the $ positional operator does not work for these match expressions.
Test
c = db.c; c.drop(); // $ operator works with equality match. c.save( { a:[ 1, 2 ] } ); c.update( { a:1 }, { $set:{ 'a.$':3 } } ); printjson( c.findOne() ); // $ operator does not work with $ne match. c.update( { a:{ $ne:10 } }, { $set:{ 'a.$':5 } } ); printjson( db.getLastError() ); // The '$' field name is not populated. printjson( c.findOne() ); // $ operator does not work with $nin match. c.update( { a:{ $nin:[ 10, 20 ] } }, { $set:{ 'a.$':5 } } ); printjson( db.getLastError() ); // The '$' field name is not populated. printjson( c.findOne() ); // $ operator does not work with $not match. c.update( { a:{ $not:{ $gt:7 } } }, { $set:{ 'a.$':5 } } ); printjson( db.getLastError() ); // The '$' field name is not populated. printjson( c.findOne() );
- depends on
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SERVER-27089 Extend the update subsystem to support more expressive updates to array fields
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- Closed
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- duplicates
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- Closed
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- related to
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DOCS-2580 Positional operator page should list negation limitation
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- Closed
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