ruby - Hash to array conversion -

the following response returned external api , assigned ret_val:

{:val1=>"add", :val2=>"delete", :val3=>"update"} {:val1=>"add_name", :val2=>"delete_name", :val3=>"update_name"} {:val1=>"add_city", :val2=>"delete_city", :val3=>"city"} 

i want convert ret_val array values assigned val1, val2, , val3 can extracted giving val1, val2, , val3.so see key , value pair of comma separated pairs . expected output :

val1 : add val2 : delete val3:update 

till last row returned api. please suggest. note: api return response in above format duplicate key.

below code snippet give desire result:

#ret_val=calling api ret_val.each { |x|   x.each { |val|  puts "#{val[0]} :#{val[1]}" } }