mongodb match cond
New in version 2.6. $cond requires all three arguments ( if-then-else ) for either syntax. If the <boolean-expression> evaluates to true , then $cond evaluates and returns the value of the <true-case> expression. Otherwise, $cond evaluates and,Returns an array with only those elements that match the condition. ... cond, An expression that resolves to a boolean value used to determine if an element ... ,$match takes a document that specifies the query conditions. The query syntax is identical to the read operation query syntax; i.e. $match does not accept raw ... ,"Did not match". $switch: branches: [ case: "this is true", then: "first case" }, case: false, then: "second case" } ], default: "Did not match" } }. "First case" ... , You really only need change the cond on the $filter here;. Filtering the "members" ... For MongoDB 3.4 you can use $in : "viewedDetails": ... groupId" and returns true or false depending on if it is a match. If you cannot use $in, While I see what you are trying to achieve, the basic premise is that $match is an identifier for a pipeline stage in itself and therefore can only be ..., Create the query object to be used with $match outside the pipeline first with native JavaScript conditionals as using the $cond operator is only ..., You could try an $or and say "If it's not type A or the date is x": $match: $and: [ deleted: false}, $or: [ type: $ne: 'A'}}, date: $gte: ..., i've tried to use $cond within $match in one of the stages of an aggregation as shown below : "$match" : "field1" : "$cond" : "if" : "$eq" ..., Description. When using $cond in projections, it would be useful to have $match as a boolean expression. Use Case: ...
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 mongodb match cond 相關參考資料
$cond (aggregation) — MongoDB Manual
New in version 2.6. $cond requires all three arguments ( if-then-else ) for either syntax. If the <boolean-expression> evaluates to true , then $cond evaluates and returns the value of the <t... https://docs.mongodb.com $filter (aggregation) — MongoDB Manual
Returns an array with only those elements that match the condition. ... cond, An expression that resolves to a boolean value used to determine if an element ... https://docs.mongodb.com $match (aggregation) — MongoDB Manual
$match takes a document that specifies the query conditions. The query syntax is identical to the read operation query syntax; i.e. $match does not accept raw ... https://docs.mongodb.com $switch (aggregation) — MongoDB Manual
"Did not match". $switch: branches: [ case: "this is true", then: "first case" }, case: false, then: "second case" } ], default: "Did not match" }... https://docs.mongodb.com How to $filter where condition is matched against an array ...
You really only need change the cond on the $filter here;. Filtering the "members" ... For MongoDB 3.4 you can use $in : "viewedDetails": ... groupId" and returns true or fal... https://stackoverflow.com MongoDB $match inside $cond - Stack Overflow
While I see what you are trying to achieve, the basic premise is that $match is an identifier for a pipeline stage in itself and therefore can only be ... https://stackoverflow.com MongoDB aggregation pipeline : using $cond to return a $match ...
Create the query object to be used with $match outside the pipeline first with native JavaScript conditionals as using the $cond operator is only ... https://stackoverflow.com MongoDB how to add conditional $match condition - Stack Overflow
You could try an $or and say "If it's not type A or the date is x": $match: $and: [ deleted: false}, $or: [ type: $ne: 'A'}}, date: $gte: ... https://stackoverflow.com Use $cond within $match in mongoDB aggregation - Stack Overflow
i've tried to use $cond within $match in one of the stages of an aggregation as shown below : "$match" : "field1" : "$cond" : "if" : "$eq"&n... https://stackoverflow.com [SERVER-9606] $cond operator should allow $match as a ...
Description. When using $cond in projections, it would be useful to have $match as a boolean expression. Use Case: ... https://jira.mongodb.org |