[Redis 2.6] Add support to getdel

Author: heyvito

lib/redis.rb

@@ -1110,6 +1110,18 @@ def getset(key, value)
     end
   end
 
+  # Get the value of key and delete the key. This command is similar to GET,
+  # except for the fact that it also deletes the key on success.
+  #
+  # @param [String] key
+  # @return [String] the old value stored in the key, or `nil` if the key
+  #   did not exist
+  def getdel(key)
+    synchronize do |client|
+      client.call([:getdel, key])
+    end
+  end
+
   # Get the length of the value stored in a key.
   #
   # @param [String] key

lib/redis/distributed.rb

@@ -316,6 +316,11 @@ def get(key)
       node_for(key).get(key)
     end
 
+    # Get the value of a key and delete it.
+    def getdel(key)
+      node_for(key).getdel(key)
+    end
+
     # Get the values of all the given keys as an Array.
     def mget(*keys)
       mapped_mget(*keys).values_at(*keys)

test/lint/strings.rb

@@ -115,6 +115,14 @@ def test_psetex_with_non_string_value
       end
     end
 
+    def test_getdel
+      target_version "6.2" do
+        assert r.set("foo", "bar")
+        assert_equal "bar", r.getdel("foo")
+        assert_equal nil, r.get("foo")
+      end
+    end
+
     def test_getset
       r.set("foo", "bar")