hash using multiple array value in ruby

Question

How I'm trying to build a hash for the following input

[["Company", "Add"], ["Company", "Edit"], ["Company", "Delete"], ["Company", "List"], ["Caterer", "Add"], ["Caterer", "Edit"], ["User", "Add"]]

The output should be

[{'Company'=>['Add', 'List', 'Edit', 'Delete']},
 {'Caterer'=>['Add', 'List', 'Edit', 'Delete']},
 {'User'=>['Add']}]

Try 1:

input = [["Company", "Add"], ["Company", "Edit"], ["Company", "Delete"], ["Company", "List"], ["Caterer", "Add"], ["Caterer", "Edit"], ["User", "Add"]]
a=[]
input.each do |inp|
  tmp = Hash.new
  a<< tmp.update(inp[0] => inp[1])
end

result:

[{"Company"=>"Add"}, {"Company"=>"Edit"}, {"Company"=>"Delete"}, {"Company"=>"List"}, {"Caterer"=>"Add"}, {"Caterer"=>"Edit"}, {"User"=>"Add"}]

What happened to "Create"? Could it be that your output is not matching because the input is also wrong? — msergeant
– msergeant, Commented Aug 20, 2015 at 14:12
@Зелёный check my result and from that is it possible to group key and values? — Ferdy
– Ferdy, Commented Aug 20, 2015 at 14:31

ndnenkov · Accepted Answer · 2015-08-20 14:43:34Z

1

input = [["Company", "Add"], ["Company", "Edit"], ["Company", "Delete"], ["Company", "List"], ["Caterer", "Add"], ["Caterer", "Edit"], ["User", "Add"]]

as_hash = input.group_by(&:first)
as_hash.each do |entity, actions|
  as_hash[entity] = actions.flatten.reject do |action|
    action == entity
  end.sort_by { |action| ['Add', 'List', 'Edit', 'Delete'].index action }
end

EDIT: I just saw that you want an array of the pairs, instead of a hash. You can do that by:

as_hash.map { |pair| Hash[*pair] }

edited Aug 20, 2015 at 14:43

answered Aug 20, 2015 at 14:27

ndnenkov

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3 Comments

Roman Kiselenko Over a year ago

same as below, output is differ with OP, also it's create a hash, but OP required an array of hashes

Roman Kiselenko Over a year ago

anyway, {"Company"=>["Add", "List", "Edit", "Delete"], "Caterer"=>["Add", "Edit"], "User"=>["Add"]} it's not the same as OP wanted. Caterer is wrong., also it create an one hash, but OP wanted, an array of hashes.

ndnenkov Over a year ago

@Зелёный, fixed. Thanks again!

Horacio · Accepted Answer · 2015-08-20 14:48:28Z

0

This should work

result={}
[["Company", "Create"], ["Company", "Edit"], ["Company", "Delete"], ["Company", "List"], ["Caterer", "Create"], ["Caterer", "Edit"], ["User", "Add"]].each do  |value|
   result[value[0]]=[] unless result.has_key? value[0]
   result[value[0]] << value[1]
end
puts result.to_s

{"Company"=>["Create", "Edit", "Delete", "List"], "Caterer"=>["Create", "Edit"], "User"=>["Add"]}

But is not an array of hashes

If you still want to get a array you could do this

r=result.map{|k,v| {k=>v} }

edited Aug 20, 2015 at 14:48

answered Aug 20, 2015 at 14:19

Horacio

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1 Comment

Roman Kiselenko Over a year ago

Caterer key is wrong, as like Company. {"Company"=>["Create", "Edit", "Delete", "List"], "Caterer"=>["Create", "Edit"], "User"=>["Add"]}

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