inject method to retrieve data from hash - ruby-on-rails

Question

I'm having trouble getting the method below in my user model to handle a hash ('auth') I'm getting from LinkedIn for user signin:
def self.deep_get auth, *fields
auth.inject(auth) { |acc, e| acc[e] if acc }
end
I call the 'deep_get' method later in my user model as I create a user using omniauth/linkedin gem. However, it's returning nil values for the provider/uid/headline/email user fields that I know are not nil.
I included first_name and last_name fields as an example because this approach is working (not returning nil values), but (as I realize) bad style/exception handling. Any ideas as to why my deep_get inject method isn't working to retrieve the data in the hash as I'd like it to?
def self.create_from_omniauth(auth)
create! do |user|
# i'd like to retrieve user information from linkedin per the following with my inject method, but i am getting nil values when i should be getting data.
# :provider and :uid are on the same branch level of data. first_name,last_name,email,etc. are on a branch just below called 'info'
user.provider = deep_get(auth, :provider)
user.uid = deep_get(auth, :uid)
user.headline = deep_get(auth, :info, :headline)
user.email = deep_get(auth, :info, :email)
# the below is working but i know pokemon exception handling is not good style.
begin
user.first_name = auth["info"]["first_name"]
rescue
end
begin
user.last_name = auth["info"]["last_name"]
rescue
end

Answer 1

try this
def deep_find(obj,key)
if obj.respond_to?(:key?) && obj.key?(key)
obj[key]
elsif obj.respond_to?(:each)
r = nil
obj.find{ |*a| r=deep_find(a.last,key) }
r
end
end
or try this
class Hash
def deep_fetch(key, default = nil)
default = yield if block_given?
(deep_find(key) or default) or nil
end
def deep_find(key)
if key?(key)
self[key]
else
self.values.inject(nil) do |memo, v|
memo = v.deep_find(key) if v.respond_to?(:deep_find)
memo unless memo.nil?
end
end
end
end