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164 lines
2.2 KiB
Markdown
164 lines
2.2 KiB
Markdown
This operator is used to update node values. It can be used in either the:
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### plain form: `=`
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Which will assign the LHS node values to the RHS node values. The RHS expression is run against the matching nodes in the pipeline.
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### relative form: `|=`
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This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
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## Examples
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### Update node to be the child value
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Given a sample.yml file of:
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```yaml
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a:
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b:
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g: foof
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```
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then
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```bash
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yq eval '.a |= .b' sample.yml
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```
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will output
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```yaml
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a:
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g: foof
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```
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### Update node to be the sibling value
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Given a sample.yml file of:
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```yaml
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a:
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b: child
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b: sibling
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```
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then
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```bash
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yq eval '.a = .b' sample.yml
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```
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will output
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```yaml
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a: sibling
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b: sibling
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```
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### Updated multiple paths
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Given a sample.yml file of:
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```yaml
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a: fieldA
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b: fieldB
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c: fieldC
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```
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then
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```bash
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yq eval '(.a, .c) |= "potatoe"' sample.yml
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```
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will output
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```yaml
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a: potatoe
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b: fieldB
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c: potatoe
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```
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### Update string value
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Given a sample.yml file of:
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```yaml
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a:
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b: apple
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```
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then
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```bash
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yq eval '.a.b = "frog"' sample.yml
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```
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will output
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```yaml
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a:
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b: frog
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```
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### Update string value via |=
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Note there is no difference between `=` and `|=` when the RHS is a scalar
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Given a sample.yml file of:
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```yaml
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a:
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b: apple
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```
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then
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```bash
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yq eval '.a.b |= "frog"' sample.yml
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```
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will output
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```yaml
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a:
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b: frog
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```
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### Update selected results
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Given a sample.yml file of:
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```yaml
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a:
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b: apple
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c: cactus
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```
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then
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```bash
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yq eval '.a[] | select(. == "apple") |= "frog"' sample.yml
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```
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will output
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```yaml
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a:
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b: frog
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c: cactus
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```
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### Update array values
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Given a sample.yml file of:
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```yaml
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- candy
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- apple
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- sandy
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```
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then
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```bash
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yq eval '.[] | select(. == "*andy") |= "bogs"' sample.yml
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```
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will output
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```yaml
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- bogs
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- apple
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- bogs
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```
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### Update empty object
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Given a sample.yml file of:
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```yaml
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'': null
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```
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then
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```bash
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yq eval '.a.b |= "bogs"' sample.yml
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```
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will output
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```yaml
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'': null
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a:
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b: bogs
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```
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### Update empty object and array
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Given a sample.yml file of:
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```yaml
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'': null
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```
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then
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```bash
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yq eval '.a.b[0] |= "bogs"' sample.yml
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```
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will output
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```yaml
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'': null
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a:
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b:
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- bogs
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```
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