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Projection: <field>: <1 or true> and <field>: <0 or false> #377

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Mar 21, 2022
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Projection: <field>: <1 or true> and <field>: <0 or false> #377

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9101afa
projection simplest
seeforschauer Mar 21, 2022
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WIP
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remove sort revert
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updated tests
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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -4,6 +4,7 @@
/bin/
/vendor/
cover.txt
cover.html
old.txt
new.txt

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10 changes: 10 additions & 0 deletions internal/handlers/common/projection.go
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Expand Up @@ -19,5 +19,15 @@ import "github.com/FerretDB/FerretDB/internal/types"
// ProjectDocuments modifies given documents in places according to the given projection.
func ProjectDocuments(docs []*types.Document, projection *types.Document) error {
// TODO

projectionMap := projection.Map()
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it can be done w/o creation of new variable..

for i := 0; i < len(docs); i++ {
for k := range docs[i].Map() {
if _, ok := projectionMap[k]; !ok {
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We should check the value too. For example, 0 or false should remove the field.

Or the plan is to do that in a different PR?

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Then I'd add new tests for it too.

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@seeforschauer seeforschauer Mar 21, 2022 •
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I'd rather add tests and add code

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In this PR, or in different one?

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In this PR

docs[i].Remove(k)
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Do we have a dance test for that? It is not clear from documentation how MongoDB behaves there

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no, dance has no tests for it at all,
can it be merged to not to stop Dmitry?

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Sure

}
}
}

return nil
}