how to merge value inside array of hash in ruby?

Question

i have array of hash like this :

a = [{:transaction_type=>"nationalvoice", :transaction_duration=>181}, {:transaction_type=>"nationalvoice", :transaction_duration=>60}, {:transaction_type=>"call", :transaction_duration=>200}]

how to merge value based transaction_type = "nationalvoice" ?

i want get result like this :

a = [{:transaction_type=>"nationalvoice", :transaction_duration=>241}, {:transaction_type=>"call", :transaction_duration=>200}]

how do that?

thanks before

Arup Rakshit · Accepted Answer · 2014-03-04 08:12:01Z

2

Do as below :

a = [{:transaction_type=>"nationalvoice", :transaction_duration=>181}, {:transaction_type=>"nationalvoice", :transaction_duration=>60}, {:transaction_type=>"call", :transaction_duration=>200}]


array_merge_hash = a.group_by { |hash1| hash1[:transaction_type] }.map do |_,v|
  v.inject do |ele_hash2,ele_hash1| 
     ele_hash2.merge(ele_hash1) {|k,o,n| k == :transaction_duration ? o+n : o }
  end
end

edited Mar 4, 2014 at 8:12

answered Mar 4, 2014 at 6:46

Arup Rakshit

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falsetru · Accepted Answer · 2014-03-04 06:48:48Z

Using Enumerable#group_by:

a = [
  {:transaction_type=>"nationalvoice", :transaction_duration=>181},
  {:transaction_type=>"nationalvoice", :transaction_duration=>60},
  {:transaction_type=>"call", :transaction_duration=>200},
]

groups = a.group_by { |h| h[:transaction_type] }
# => {"nationalvoice"=>[
#      {:transaction_type=>"nationalvoice", :transaction_duration=>181},
#      {:transaction_type=>"nationalvoice", :transaction_duration=>60}
#    ],
#    "call"=>[
#      {:transaction_type=>"call", :transaction_duration=>200}
#    ]}

merged_hashes = groups.map { |k, hashes|
  total = hashes.map { |h| h[:transaction_duration] }.reduce(:+)
  {transaction_type: k, transaction_duration: total} # merged hash
}

# => [{:transaction_type=>"nationalvoice", :transaction_duration=>241},
#     {:transaction_type=>"call", :transaction_duration=>200}]

aarti · Accepted Answer · 2014-03-09 21:28:07Z

0

You could also use Enumerable#each_with_object

a =[{:transaction_type=>"nationalvoice", :transaction_duration=>181}, {:transaction_type=>"nationalvoice", :transaction_duration=>60}, {:transaction_type=>"call", :transaction_duration=>200}]
n = a.each_with_object({}) do |obj,hsh|
   hsh[obj[:transaction_type]] ? hsh[obj[:transaction_type]][:transaction_duration]+= obj[:transaction_duration].to_i : hsh[obj[:transaction_type]]=obj
end
print n.values

# [{:transaction_type=>"nationalvoice", :transaction_duration=>241}, {:transaction_type=>"call", :transaction_duration=>200}]

edited Mar 9, 2014 at 21:28

answered Mar 9, 2014 at 21:22

aarti

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