Details
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New Feature
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Resolution: Unresolved
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Major - P3
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None
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None
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Query Execution
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Fully Compatible
Description
When using $cond in projections, it would be useful to have $match as a boolean expression.
Use Case:
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db.objects.aggregate([
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{
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$match: { status: "active" } |
}, {
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$project: {
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name: 1,
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meta: 1,
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tags: 1,
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score: {
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$add: [
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{
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$cond:[{
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$match: { tags: "a tag I like" } |
}, 100, 0]
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}, {
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$cond:[{
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$match: { tags: "a tag I really like" } |
}, 250, 0]
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}, {
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$cond:[{
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$match: { tags: "a tag I dislike" } |
}, -100, 0]
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}, {
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$cond:[{
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$match: { "meta.promoted": true } |
}, 1000, 0]
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}
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]
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}
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}
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},{
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$match: { score: { $gt: 0 } }
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}
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])
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This would eliminate the need to add other $cond expressions like $in (SERVER-6146)
Attachments
Issue Links
- is related to
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SERVER-34766 Allow $expr or $$field in the $geoNear stage
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- Closed
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- Closed
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- related to
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- Closed
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