module Hashie::Extensions::DeepFetch
Searches a deeply nested datastructure for a key path, and returns the associated value.
options = { user: { location: { address: '123 Street' } } } options.deep_fetch :user, :location, :address #=> '123 Street'
If a block is provided its value will be returned if the key does not exist.
options.deep_fetch(:user, :non_existent_key) { 'a value' } #=> 'a value'
This is particularly useful for fetching values from deeply nested api responses
or params hashes.
Public Instance Methods
deep_fetch(*args) { |arg| ... }
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# File lib/hashie/extensions/deep_fetch.rb, line 17 def deep_fetch(*args, &block) args.reduce(self) do |obj, arg| begin arg = Integer(arg) if obj.is_a? Array obj.fetch(arg) rescue ArgumentError, IndexError, NoMethodError => e break yield(arg) if block raise UndefinedPathError, "Could not fetch path (#{args.join(' > ')}) at #{arg}", e.backtrace end end end