Or you can write code under the example

//t_zset.c 889 lines
if (zobj->encoding == REDIS_ENCODING_ZIPLIST) {
            unsigned char *eptr;

            /* Prefer non-encoded element when dealing with ziplists. */
            ele = c->argv[3+j*2];
            if ((eptr = zzlFind(zobj->ptr,ele,&curscore)) != NULL) {
               // assert~~~~~~!!!!! exist key
            } else {
                /* Optimize: check if the element is too large or the list
                 * becomes too long *before* executing zzlInsert. */
                zobj->ptr = zzlInsert(zobj->ptr,ele,score);
                if (zzlLength(zobj->ptr) > server.zset_max_ziplist_entries)
                    zsetConvert(zobj,REDIS_ENCODING_SKIPLIST);
                if (sdslen(ele->ptr) > server.zset_max_ziplist_value)
                    zsetConvert(zobj,REDIS_ENCODING_SKIPLIST);

                signalModifiedKey(c->db,key);
                server.dirty++;
                if (!incr) added++;
            }
        } else if (zobj->encoding == REDIS_ENCODING_SKIPLIST) {
            zset *zs = zobj->ptr;
            zskiplistNode *znode;
            dictEntry *de;

            ele = c->argv[3+j*2] = tryObjectEncoding(c->argv[3+j*2]);
            de = dictFind(zs->dict,ele);
            if (de != NULL) {
                // assert~~~~~~!!!!! exist key
            } else {
                znode = zslInsert(zs->zsl,score,ele);
                incrRefCount(ele); /* Inserted in skiplist. */
                redisAssertWithInfo(c,NULL,dictAdd(zs->dict,ele,&znode->score) == DICT_OK);
                incrRefCount(ele); /* Added to dictionary. */

                signalModifiedKey(c->db,key);
                server.dirty++;
                if (!incr) added++;
            }
        }

and issues are not for questions ;)
Please use the Redis DB google group
thx~ : )

how to assert a key is exist in a sorted set ? #792

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