How to get the following result by truncating data? - ruby-on-rails

Question

I have Coffeescript file in the following format. I have to generate all the possible combinations using the : :. I have already written the code for combinations. It is working fine. But, somehow the configuration file is changed & I have to modify that code. So, could anyone please help me to solve this problem?
abTests:
productRanking:
version: 4
groups: [
ratio:
default: 1
us: 0.90
me: 0.0
value: "LessPopularityEPC"
,
ratio:
default: 0
us: 0.1
value: "CtrEpcJob"
,
ratio:
default: 0
me: 1.0
value: "RandomPerVisitor"
]
I would like to have the data formatted in the following format:
productRanking:
"LessPopularityEPC"
"CtrEpcJob"
"RandomPerVisitor"
]
I am using the following code here :
START_REGEXP = /# AB Tests/
END_REGEXP = /# Routes/
COMMENT_EXP = /#/
COMMA_REGEXP = /,/
START_BLOCK = /\[/
END_BLOCK = /]/
def Automate_AB_tests.abTestParser(input_file,output_file)
raise "Source File doesn't exist at provided path" unless File.exists?(input_file)
flag = false #setting default value of flag=FALSE to parse the data between two REGEX
File.open(output_file, "w") do |ofile| #opening destination file in WRITE mode
File.foreach(input_file) do |iline| #Reading each lines of source file
flag = true if iline =~ START_REGEXP
ofile.puts(iline.sub(" ", '').sub("value:",'')) if flag && (iline =~ /value/ || iline=~ /,/ || iline =~ /]/) unless (iline =~ COMMENT_EXP or iline =~ COMMA_REGEXP)
flag = false if iline =~ END_REGEXP
end
end
end

Answer 1

Assuming that what you want is to take each key under abTests, e.g. ProductRanking, and return a hash with those keys having the value of the value key in their first group, then like so:
data['abTests'].each_with_object({}) do |(key, testData), resultingHash|
resultingHash[key] = testData['groups'].first['value']
end
However, if that's not what you want, then you need to be a bit more clear. Try working through the operations you want to achieve on paper, and break down your thought process step-by-step. The two operations that tend to be most useful when processing list or hash data are map and reduce (each_with_object being a form of reduction). Look through the documentation of the Enumerable module of Ruby for more info.

Answer 2

Assume that you have a ruby hash, which can be rewrite as
data = {:abTests=>{:productRanking=>{:version=>4, :groups=>[{:ratio=>{:default=>1, :us=>0.9, :me=>0.0}, :value=>"LessPopularityEPC"}]}}}
you can loop over this data hash to get your desired result
for eg:
result_hash = {}
data[:abTests].each do |key, value|
result_hash = {k.to_sym => value[:groups][0][:value]}
puts result_hash
end
puts result_hash[:productRanking] //outputs "LessPopularityEPC"