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Dealing with crazy nested hashes in MailChimp API responses
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require "delegate" | |
require "singleton" | |
module MailingList | |
class SafeResponse < SimpleDelegator | |
def self.safe_delegate(*methods) | |
methods.each do |method| | |
define_method(method, ->(*args, &block) { | |
value = __getobj__.send(method, *args, &block) | |
value ? SafeResponse.new(value) : BlackHole.instance | |
}) | |
end | |
end | |
safe_delegate :[] | |
safe_delegate :detect, :find, :first, :select | |
end | |
class BlackHole | |
include Singleton | |
def itself; self end # TODO remove when upgrading to Ruby 2.2+ | |
[:detect, :find, :first, :select].each do |method| | |
alias_method method, :itself | |
end | |
def [](*); self end | |
def empty?; true end | |
alias_method :blank?, :empty? | |
def presence; nil end | |
def present?; false end | |
end | |
end | |
response = MailingList::SafeResponse.new(foo: [{bar: true}, {baz: false}]) | |
response[:foo].first[:bar].presence # => true | |
response[:foo].first[:baz].presence # => nil | |
response[:nonsense].find { |x| false }.first["asdf"][0].present? # => false |
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