Make find_signed and find_signed! consistent

[santib]

Summary

find_signed allows finding by a custom primary key, but find_signed! doesn't allow it. I think there should be consistency between them, so I added support for custom primary keys in find_signed!

[kamipo]

Originally find supports custom primary key.

rails/activerecord/lib/active_record/relation/finder_methods.rb

Lines 427 to 428 in 4a1b57c

	def find_with_ids(*ids)
	raise UnknownPrimaryKey.new(@klass) if primary_key.nil?

rails/activerecord/lib/active_record/relation/finder_methods.rb

Lines 449 to 458 in 4a1b57c

	def find_one(id)
	if ActiveRecord::Base === id
	raise ArgumentError, <<-MSG.squish
	You are passing an instance of ActiveRecord::Base to `find`.
	Please pass the id of the object by calling `.id`.
	MSG
	end
	relation = where(primary_key => id)
	record = relation.take

Does find not work as expected?

[santib]

Sorry @kamipo my bad, I was around the signed id code and the difference in the methods implementation caught my attention. Now that you point me to the ActiveRecord's find code I think this PR can be closed. Thanks