Hi, In MongoDB while running an aggregation, the following works: localField: "TransID", foreignField:

Question

Hi, In MongoDB while running an aggregation, the following works: localField: "TransID", foreignField:

"Body.Data.Meta.Item.Value",

But as a pipeline the following fails:

$match: {
"Body.Data.Meta.Item.Value": "$$TransID"
}

What could be the problem?

0

01.10.2021

5 ответов

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Raptor Blue Bear

A X
Why did you add two dollar signs? Typically it's j...

$ is referred to the root document fields where as $$ referred to the variable names.

0

03.10.2021

A X

Raptor Blue Bear
$ is referred to the root document fields where as...

I see.

0

03.10.2021

bitwise

did you solve the issue ?

0

11.10.2021

Kim Автор вопроса

bitwise
did you solve the issue ?

Nope, I ended up using the first option then filtering the results

0

12.10.2021

A X · Accepted Answer

A X

Why did you add two dollar signs? Typically it's just one dollar sign. Is one dollar sign also not working? In which case you'll have to search for some constant value or set of values.

0

03.10.2021

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Hi, In MongoDB while running an aggregation, the following works: localField: "TransID", foreignField:

5 ответов

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