Improper indentation in converting ruby hash to yaml - ruby-on-rails

Question

I am trying to convert ruby hash object to YAML format using YAML.dump(obj) but I am getting improper indentation even after using dump options.
I have below executable ruby script :
#!/usr/bin/ruby
require "yaml"
require "erb"
context_path = ARGV[0]
context = YAML.load_file(context_path)['context']
def get_yaml(obj)
YAML.dump( obj['imports']['external_repositories']['credentials'] ).sub(/.*?\n/,'')
end
The value of - obj['imports']['external_repositories']['credentials'] is
{"iacbox"=>{"basic"=>{"name"=>"", "password"=>""}}, "nexus"=>{"basic"=>{"name"=>"cpreader", "password"=>"swordfish"}}}
Note : I used the sub method to remove "---" at the start of the output
The ERB template calls the above get_yaml method as :
credentials:
<%= get_yaml( context ) %>
The output that is coming is :
credentials:
iacbox:
basic:
name: ''
password: ''
nexus:
basic:
name: cpreader
password: swordfish
while I am expecting the output as :
credentials:
iacbox:
basic:
name: ''
password: ''
nexus:
basic:
name: cpreader
password: swordfish
How can I get the expected output from a dump?

Answer 1

I think the easiest thing for you to do here is just put the credentials key also in the Hash, i.e. change your template snippet so that it is one line:
<%= get_yaml( context ) %>
And change your get_yaml method to be:
def get_yaml(obj)
YAML.dump({'credentials' => obj['imports']['external_repositories']['credentials']})
.sub(/.*?\n/,'')
end
If that doesn't work for you, for example, if you have additional keys underneath the credentials key that you haven't mentioned, you could also do something like this:
def get_yaml(obj)
YAML.dump(obj['imports']['external_repositories']['credentials'])
.sub(/^---\n/,'')
.gsub(/\n/m,"\n ")
end
Where gsub(/\n/m,"\n ") replaces all newlines with a newline plus two spaces.