Ruby Nested Hash Merge - ruby

Question

Given something like this:
hey = {
some_key: {
type: :object,
properties: {
id: { type: :string, example: '123', description: 'Id' },
created_at: { type: :string, example: '2019-02-14 14:13:55'},
updated_at: { type: :string, example: '2019-02-14 14:13:55'},
type: { type: :string, example: 'something', description: 'Resource type' },
token: { type: :string, example: 'token', description: 'Some description of token' }
}
}
}
I would like to go through all keys until I find one named properties, then mutate its content such that the keys become the value of a description key if it doesn't exit in its nested hash.
So for the example above, the hash would end up like this:
hey = {
some_key: {
type: :object,
properties: {
id: { type: :string, example: '123', description: 'Id' },
created_at: { type: :string, example: '2019-02-14 14:13:55', description: 'Created At'},
updated_at: { type: :string, example: '2019-02-14 14:13:55', description: 'Updated At'},
type: { type: :string, example: 'something', description: 'Resource type' },
token: { type: :string, example: 'token', description: 'Some description of token' }
}
}
}
created_at and updated_at didn't have a description.
It should also handle if token, for instance, had a properties property.
I came up with a solution that works but I am really curious on how I can improve it?
My solution below:
def add_descriptions(hash)
return unless hash.is_a?(Hash)
hash.each_pair do |key, value|
if key == :properties
value.each do |attr, props|
if props[:description].nil?
props.merge!(description: attr.to_s)
end
end
end
add_descriptions(value)
end
end

Answer 1

As I understand all you know about the hash hey is that it is comprised of nested hashes.
def recurse(h)
if h.key?(:properties)
h[:properties].each do |k,g|
g[:description] = k.to_s.split('_').map(&:capitalize).join(' ') unless
g.key?(:description)
end
else
h.find { |k,obj| recurse(obj) if obj.is_a?(Hash) }
end
end
recurse hey
#=> {:id=>{:type=>:string, :example=>"123", :description=>"Id"},
# :created_at=>{:type=>:string, :example=>"2019-02-14 14:13:55",
# :description=>"Created At"},
# :updated_at=>{:type=>:string, :example=>"2019-02-14 14:13:55",
# :description=>"Updated At"},
# :type=>{:type=>:string, :example=>"something",
# :description=>"Resource type"},
# :token=>{:type=>:string, :example=>"token",
# :description=>"Some description of token"}}
The return value is the updated value of hey.