[PLT-7364] Ability to Direct Message yourself (#7696)

* [PLT-7364] Ability to Direct Message yourself

* [PLT-7364] add tests

store/sqlstore/channel_store.go

@@ -162,7 +162,10 @@ func (s SqlChannelStore) SaveDirectChannel(directchannel *model.Channel, member1
 					member2.ChannelId = newChannel.Id
 
 					member1Result := s.saveMemberT(transaction, member1, newChannel)
-					member2Result := s.saveMemberT(transaction, member2, newChannel)
+					member2Result := member1Result
+					if member1.UserId != member2.UserId {
+						member2Result = s.saveMemberT(transaction, member2, newChannel)
+					}
 
 					if member1Result.Err != nil || member2Result.Err != nil {
 						transaction.Rollback()

store/storetest/channel_store.go

@@ -146,6 +146,21 @@ func testChannelStoreSaveDirectChannel(t *testing.T, ss store.Store) {
 	if err := (<-ss.Channel().SaveDirectChannel(&o1, &m1, &m2)).Err; err == nil {
 		t.Fatal("Should not be able to save non-direct channel")
 	}
+
+	// Save yourself Direct Message
+	o1.Id = ""
+	o1.DisplayName = "Myself"
+	o1.Name = "zz" + model.NewId() + "b"
+	o1.Type = model.CHANNEL_DIRECT
+	if err := (<-ss.Channel().SaveDirectChannel(&o1, &m1, &m1)).Err; err != nil {
+		t.Fatal("couldn't save direct channel", err)
+	}
+
+	members = (<-ss.Channel().GetMembers(o1.Id, 0, 100)).Data.(*model.ChannelMembers)
+	if len(*members) != 1 {
+		t.Fatal("should have saved just 1 member")
+	}
+
 }
 
 func testChannelStoreCreateDirectChannel(t *testing.T, ss store.Store) {