Adds include? to ordered set (#126)

* adds include? to ordered set

* check only if element is included

* remove not needed assertion

* Update lib/kredis/types/ordered_set.rb

Co-authored-by: Lewis Buckley <lewis@lewisbuckley.co.uk>

* add zscore to proxying

---------

Co-authored-by: Lewis Buckley <lewis@lewisbuckley.co.uk>

Author: EduardoAntequera

lib/kredis/types/ordered_set.rb

@@ -3,7 +3,7 @@
 class Kredis::Types::OrderedSet < Kredis::Types::Proxying
   prepend Kredis::DefaultValues
 
-  proxying :multi, :zrange, :zrem, :zadd, :zremrangebyrank, :zcard, :exists?, :del
+  proxying :multi, :zrange, :zrem, :zadd, :zremrangebyrank, :zcard, :exists?, :del, :zscore
 
   attr_accessor :typed
   attr_reader :limit
@@ -17,6 +17,10 @@ def remove(*elements)
     zrem(types_to_strings(elements, typed))
   end
 
+  def include?(element)
+    !!zscore(type_to_string(element, typed))
+  end
+
   def prepend(elements)
     insert(elements, prepending: true)
   end

test/types/ordered_set_test.rb

@@ -71,6 +71,13 @@ class OrderedSetTest < ActiveSupport::TestCase
     assert @set.exists?
   end
 
+  test "include?" do
+    @set.append(%w[ 1 2 3 4 5 ])
+
+    assert @set.include?(1)
+    assert_not @set.include?(6)
+  end
+
   test "appending over limit" do
     @set.append(%w[ 1 2 3 4 5 ])
     @set.append(%w[ 6 7 8 ])