[Redis 6.2] Add LT/GT options to ZADD

lib/redis.rb

@@ -1641,6 +1641,10 @@ def zcard(key)
   #   add elements)
   #   - `:nx => true`: Don't update already existing elements (always
   #   add new elements)
+  #   - `:lt => true`: Only update existing elements if the new score
+  #   is less than the current score
+  #   - `:gt => true`: Only update existing elements if the new score
+  #   is greater than the current score
   #   - `:ch => true`: Modify the return value from the number of new
   #   elements added, to the total number of elements changed (CH is an
   #   abbreviation of changed); changed elements are new elements added
@@ -1655,10 +1659,12 @@ def zcard(key)
   #   pairs that were **added** to the sorted set.
   #   - `Float` when option :incr is specified, holding the score of the member
   #   after incrementing it.
-  def zadd(key, *args, nx: nil, xx: nil, ch: nil, incr: nil)
+  def zadd(key, *args, nx: nil, xx: nil, lt: nil, gt: nil, ch: nil, incr: nil)
     command = [:zadd, key]
     command << "NX" if nx
     command << "XX" if xx
+    command << "LT" if lt
+    command << "GT" if gt
     command << "CH" if ch
     command << "INCR" if incr
 

test/lint/sorted_sets.rb

@@ -45,6 +45,35 @@ def test_zadd
         # Incompatible options combination
         assert_raises(Redis::CommandError) { r.zadd("foo", 1, "s1", xx: true, nx: true) }
       end
+
+      target_version "6.2" do
+        # LT option
+        r.zadd("foo", 2, "s1")
+
+        r.zadd("foo", 3, "s1", lt: true)
+        assert_equal 2.0, r.zscore("foo", "s1")
+
+        r.zadd("foo", 1, "s1", lt: true)
+        assert_equal 1.0, r.zscore("foo", "s1")
+
+        assert_equal true, r.zadd("foo", 3, "s2", lt: true) # adds new member
+        r.del "foo"
+
+        # GT option
+        r.zadd("foo", 2, "s1")
+
+        r.zadd("foo", 1, "s1", gt: true)
+        assert_equal 2.0, r.zscore("foo", "s1")
+
+        r.zadd("foo", 3, "s1", gt: true)
+        assert_equal 3.0, r.zscore("foo", "s1")
+
+        assert_equal true, r.zadd("foo", 1, "s2", gt: true) # adds new member
+        r.del "foo"
+
+        # Incompatible options combination
+        assert_raises(Redis::CommandError) { r.zadd("foo", 1, "s1", nx: true, gt: true) }
+      end
     end
 
     def test_variadic_zadd
@@ -109,6 +138,28 @@ def test_variadic_zadd
         # Incompatible options combination
         assert_raises(Redis::CommandError) { r.zadd("foo", [1, "s1"], xx: true, nx: true) }
       end
+
+      target_version "6.2" do
+        # LT option
+        r.zadd("foo", 2, "s1")
+
+        assert_equal 1, r.zadd("foo", [3, "s1", 2, "s2"], lt: true, ch: true)
+        assert_equal 2.0, r.zscore("foo", "s1")
+
+        assert_equal 1, r.zadd("foo", [1, "s1"], lt: true, ch: true)
+
+        r.del "foo"
+
+        # GT option
+        r.zadd("foo", 2, "s1")
+
+        assert_equal 1, r.zadd("foo", [1, "s1", 2, "s2"], gt: true, ch: true)
+        assert_equal 2.0, r.zscore("foo", "s1")
+
+        assert_equal 1, r.zadd("foo", [3, "s1"], gt: true, ch: true)
+
+        r.del "foo"
+      end
     end
 
     def test_zrem