Change hash value if key exists in hash

Question

I am trying to change the hash value if the key exists in the hash. I have an operating algorithm to change it to the correct value, the only problem is that it changes all the values ​​in the hash, and not just the one I want. How to change only certain values ​​in a hash?

Have I tried the hash.has_key method? (key) and it still changes all my values

if @hash.has_key?(k) @hash.select {|k,v| v.price = (v.price/100)} else print "Key not found" end 

Answer 1

has_key? not your problem ... Hash#select iterates over all values.

There are two options:

 @hash.select{|k,v| v.price /= 100 if k == key} 

or

 if @hash.has_key?(key) @hash[key].price /= 100 else print "Key not found" end