I have a following array which displays information of users and some values related to the user. Following array contains information of two users Akiyo Riggs and Bingo
a1 = [["Akiyo Riggs", -32, "OverTime Hours", "",12],["Akiyo Riggs", -32,
"Regular Hours", "", 18],["Bingo",-12,"OverTime Hours","",14], ["Bingo",
-12,"Regular Hours","",32]]
How can i convert into following array of hashes in which key is the user name and value is a hash with respective values
[{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]},
{"Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}]
a1.map { |x,_,p,*ps| {x => {p => ps} } }.reduce({}, :deep_merge)
# => {"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]},
# "Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}}
Note: if efficiency is concerned, consider using deep_merge!
instead of deep_merge
, so that reduce
wouldn't create a new hash on every iteration.
Some explanation:
a1.map { |x,_,p,*ps| {x => {p => ps} } }
gives us an array of hashes like this
[{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12]}},
{"Akiyo Riggs"=>{"Regular Hours"=>["", 18]}},
{"Bingo"=>{"OverTime Hours"=>["", 14]}},
{"Bingo"=>{"Regular Hours"=>["", 32]}}]
which we can recursively merge with ActiveSupport Hash#deep_merge
You can do something like this (however, this is not quite that is you want exactly):
res = a1.group_by {|x| x[0] }.reduce({}) {|h, x| h[ x[0] ] = x[1].reduce({}) {|hh, xx| hh[ xx[2] ] = xx[3..-1] ; hh } ; h }
# => {"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]}, "Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}}
the exact thing is doing with additional step:
res.keys.map {|k| {k => res[k]}}
# => [{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]}}, {"Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}}]
a1.each_with_object({}) do |array, result|
result[array[0]] ||= {}
result[array[0]].merge!(array[2] => [array[3], array[4]])
end.map { |k, v| { k => v } }
# => [{"Akiyo Riggs"=>{"OverTime Hours"=>["", 12], "Regular Hours"=>["", 18]}}, {"Bingo"=>{"OverTime Hours"=>["", 14], "Regular Hours"=>["", 32]}}]
array.each_with_object({}) do |(name, _, hours_type, a, b), hash|
hash[name] ||= {}
hash[name][hours_type] = [a, b]
end.map do |name, values_hash|
{name => values_hash}
end
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