extracting JSON name of a hash-CodePudding

The following segment of a JSON file needs to be transformed, essentially flattening it to a single hash for sizes

    "sizes" : {
      "small" : {
        "w" : "680",
        "h" : "261",
      },
      "large" : {
        "w" : "878",
         "h" : "337",
      },
      "medium" : {
        "w" : "878",
        "h" : "337",
      }

while the child attributes are accessible as:

 parent['sizes'].each do |size|
   w: size['w'],
   h: size['h'],
   label: size
 end

will not function, as the whole hash will be loaded for the label. How can the hash's identity string only be captured?

CodePudding user response：

For hashes each calls the block once for each key in hash, passing the key-value pair as parameters.

Like this:

parent['sizes'].each do |key, size|
  # format your preferred output here
  # key is small, large, medium
  # and size is {"w"=>"680", "h"=>"261"}, ...
  # for example
  {
    w: size['w'],
    h: size['h'],
    label: key
  }
end