I have a hash like this:
hash = {
'en-us': {
where: 'USA'
},
'en-us-zone2': {
where: 'USA'
},
'en-nl': {
where: 'Netherlands'
},
'en-pt': {
where: 'Portugal'
},
}
And I tried to group them using group_by
:
result = hash.group_by { |k,v| v[:where] }
However, It returns full of array not by array of hashes. So here is expected and actual results:
{ "USA"=>
[[:"en-us", {:where=>"USA"}], [:"en-us-zone2", {:where=>"USA"}]],
"Netherlands"=>
[[:"en-nl", {:where=>"Netherlands"}]],
"Portugal"=>
[[:"en-pt", {:where=>"Portugal"}]]
}
{ "USA"=>
[{:"en-us" => {:where=>"USA"}}, {:"en-us-zone2" => {:where=>"USA"}}]
"Netherlands"=>
[{:"en-nl" => {:where=>"Netherlands"}}]
"Portugal"=>
[{:"en-pt" => {:where=>"Portugal"}}]
}
See, Actual is Array of arrays, instead of array of hashes. Hash keys becomes first array element.
How can I group my hash based on :where
?
This should work:
hash.group_by { |k,v| v[:where] }.each { |_, v| v.map! { |array| { array[0] => array[1] } } }
Or with transform_values
hash.group_by { |k,v| v[:where] }.transform_values { |v| v.map { |array| {array[0] => array[1] } } }
https://ruby-doc.org/core-2.4.0/Hash.html#method-i-transform_values