061a086641
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.
63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
// $ifNull returns the result of the first expression if not null or undefined, otherwise of the
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// second expression.
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load('jstests/aggregation/extras/utils.js');
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t = db.jstests_aggregation_ifnull;
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t.drop();
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t.save( {} );
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function assertError( expectedErrorCode, ifNullSpec ) {
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assertErrorCode(t, {$project: {a: {$ifNull: ifNullSpec}}}, expectedErrorCode)
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}
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function assertResult( expectedResult, arg0, arg1 ) {
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var res = t.aggregate( { $project:{ a:{ $ifNull:[ arg0, arg1 ] } } } ).toArray()[0];
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assert.eq( expectedResult, res.a );
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}
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// Wrong number of args.
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assertError( 16020, [] );
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assertError( 16020, [1] );
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assertError( 16020, [null] );
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assertError( 16020, [1,1,1] );
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assertError( 16020, [1,1,null] );
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assertError( 16020, [1,1,undefined] );
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// First arg non null.
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assertResult( 1, 1, 2 );
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assertResult( 2, 2, 1 );
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assertResult( false, false, 1 );
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assertResult( '', '', 1 );
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assertResult( [], [], 1 );
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assertResult( {}, {}, 1 );
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assertResult( 1, 1, null );
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assertResult( 2, 2, undefined );
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// First arg null.
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assertResult( 2, null, 2 );
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assertResult( 1, null, 1 );
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assertResult( null, null, null );
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assertResult( undefined, null, undefined );
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// First arg undefined.
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assertResult( 2, undefined, 2 );
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assertResult( 1, undefined, 1 );
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assertResult( null, undefined, null );
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assertResult( undefined, undefined, undefined );
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// Computed expression.
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assertResult( 3, { $add:[ 1, 2 ] }, 5 );
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assertResult( 20, '$missingField', { $multiply:[ 4, 5 ] } );
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// Divide/mod by 0.
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assertError(16608 , [{$divide: [1, 0]}, 0]);
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assertError(16610 , [{$mod: [1, 0]}, 0]);
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// Nested.
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t.drop();
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t.save( { d:'foo' } );
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assertResult( 'foo', '$a', { $ifNull:[ '$b', { $ifNull:[ '$c', '$d' ] } ] } );
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t.update( {}, { $set:{ b:'bar' } } );
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assertResult( 'bar', '$a', { $ifNull:[ '$b', { $ifNull:[ '$c', '$d' ] } ] } );
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