Merge pull request #26 from jwoertink/add_hincrby

Adding HINCRBY command

spec/redis_spec.cr

@@ -231,6 +231,15 @@ describe Redis::Client do
     end
   end
 
+  describe "hash" do
+    test "hincrby increments the number stored at field in the hash" do
+      redis.hset(key, {"field" => "5"})
+      redis.hincrby(key, "field", 1).should eq(6)
+      redis.hincrby(key, "field", -1).should eq(5)
+      redis.hincrby(key, "field", -10).should eq(-5)
+    end
+  end
+
   it "can pipeline commands" do
     key = random_key
 

src/commands/hash.cr

@@ -35,6 +35,10 @@ module Redis::Commands::Hash
     run command
   end
 
+  def hincrby(key : String, field : String, increment : Int | String)
+    run({"hincrby", key, field, increment.to_s})
+  end
+
   @[Deprecated("The Redis HMSET command is deprecated. Use HSET instead. This method will be removed in v1.0.0 of this shard. See https://redis.io/commands/hmset/")]
   def hmset(key : String, data : ::Hash(String, String))
     command = Array(String).new(initial_capacity: 2 + data.size)