Mapping to the Keys of a Hash - ruby-on-rails

Question

I am working with a hash called my_hash :
{"2011-02-01 00:00:00+00"=>816, "2011-01-01 00:00:00+00"=>58, "2011-03-01 00:00:00+00"=>241}
First, I try to parse all the keys, in my_hash (which are times).
my_hash.keys.sort.each do |key|
parsed_keys << Date.parse(key).to_s
end
Which gives me this :
["2011-01-01", "2011-02-01", "2011-03-01"]
Then, I try to map parsed_keys back to the keys of my_hash :
Hash[my_hash.map {|k,v| [parsed_keys[k], v]}]
But that returns the following error :
TypeError: can't convert String into Integer
How can I map parsed_keys back to the keys of my_hash ?
My aim is to get rid of the "00:00:00+00" at end of all the keys.

Answer 1

Why don't you just do this?
my_hash.map{|k,v| {k.gsub(" 00:00:00+00","") => v}}.reduce(:merge)
This gives you
{"2011-02-01"=>816, "2011-01-01"=>58, "2011-03-01"=>241}

Answer 2

There is a new "Rails way" methods for this task :)
http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys

Answer 3

Using iblue answer, you could use a regexp to handle this situation, for example:
pattern = /00:00:00(\+00)+/
my_hash.map{|k,v| {k.gsub(pattern,"") => v}}.reduce(:merge)
You could improve the pattern to handle different situations.
Hope it helps.
Edit:
Sorry, iblue have already posted the answer

Answer 4

Another alternative could be:
map
return converted two elements array [converted_key, converted_value]
convert back to a hash
irb(main):001:0> {a: 1, b: 2}.map{|k,v| [k.to_s, v.to_s]}.to_h
=> {"a"=>"1", "b"=>"2"}