Incorporate JSON into YAML with Indentation - json

Question

I'm trying to incorporate a JSON into a YAML file.
The YAML looks like this:
filebeat.inputs:
- type: log
<incorporate here with a single level indent>
enabled: true
paths:
Suppose you have the following variable:
a = { processors: { drop_event: { when: { or: [ {equals: { status: 500 }},{equals: { status: -1 }}]}}}}
I want to incorporate it into an existing YAML.
I've tried to use:
JSON.parse((a).to_json).to_yaml
After applying this, I got a valid YAML but without indentation (all lines have to be indented) and with a "---" which is Ruby's new document in YAML.
The result:
filebeat.inputs:
- type: log
---
processors:
drop_event:
when:
or:
- equals:
status: 500
- equals:
status: -1
enabled: true
The result I'm looking for:
filebeat.inputs:
- type: log
processors:
drop_event:
when:
or:
- equals:
status: 500
- equals:
status: -1
enabled: true```

Answer 1

It’s easier to produce a valid ruby object by merging hashes and then serialize the result to YAML than vice versa.
puts(yaml.map do |hash|
hash.each_with_object({}) do |(k, v), acc|
# the trick: we insert before "enabled" key
acc.merge!(JSON.parse(a.to_json)) if k == "enabled"
# regular assignment for all hash elements
acc[k] = v
end
end.to_yaml)
Results in:
---
- type: log
processors:
drop_event:
when:
or:
- equals:
status: 500
- equals:
status: -1
enabled: true
JSON.parse(a.to_json) basically converts symbols to strings.

Answer 2

In order to do that first you need to convert your original YAML into JSON
original = YAML.load(File.read(File.join('...', 'filebeat.inputs')))
# => [
{
"type": "log",
"enabled": true,
"paths": null
}
]
Then you have to merge your JSON into this original variable
original[0].merge!(a.stringify_keys)
original.to_yaml
# =>
---
-
type: log
enabled: true
paths:
processors:
drop_event:
when:
or:
- equals:
status: 500
- equals:
status: -1