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Better merge array by key example

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This commit is contained in:
Mike Farah 2021-11-29 20:53:36 +11:00
parent 51e946e6ff
commit 4c7c0b83aa
2 changed files with 9 additions and 5 deletions
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6
pkg/yqlib/doc/multiply-merge.md
View File

@ -237,6 +237,9 @@ will output
There are two parts of the complex expression. The first part is doing the hard work, it creates a map from the arrays keyed by '.a',
so that there are no duplicates. The second half converts that map back to an array.
To use this, you will need to update '.[]' to be the expression to your array (e.g. .my.array[]), and '.a' to be the key field of your array (e.g. '.name')
Given a sample.yml file of:
```yaml
- a: apple
@ -257,8 +260,7 @@ And another sample another.yml file of:
```
then
```bash
yq eval-all '
((.[] | {.a: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
yq eval-all '((.[] | {.a: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
| ( $uniqueMap | to_entries | .[]) as $item ireduce([]; . + $item.value)
' sample.yml another.yml
```

8
pkg/yqlib/operator_multiply_test.go
View File

@ -30,10 +30,12 @@ var mergeArrayWithAnchors = `sample:
`
var mergeArraysObjectKeysText = `There are two parts of the complex expression. The first part is doing the hard work, it creates a map from the arrays keyed by '.a',
so that there are no duplicates. The second half converts that map back to an array.`
so that there are no duplicates. The second half converts that map back to an array.
var mergeExpression = `
((.[] | {.a: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
To use this, you will need to update '.[]' to be the expression to your array (e.g. .my.array[]), and '.a' to be the key field of your array (e.g. '.name')
`
var mergeExpression = `((.[] | {.a: .}) as $item ireduce ({}; . * $item )) as $uniqueMap
| ( $uniqueMap | to_entries | .[]) as $item ireduce([]; . + $item.value)
`