I have a good solution to save your time. I also meet the same problem but I could not solve this problem by the first answer.
Your defualt character is utf-8. But emoji needs utf8mb4 to support it. If you have the permission to revise the configure file of mysql, you can follow this step.
Therefore, do this following step to upgrade your character set ( from utf-8 to utf8mb4).
step 1. open your my.cnf for mysql, add these following lines to your my.cnf.
[mysqld]
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
init_connect='SET NAMES utf8mb4'
[mysql]
default-character-set = utf8mb4
[client]
default-character-set = utf8mb4
step2. stop your mysql service, and start mysql service
mysql.server stop
mysql.server start
Finished! Then you can check your character are changed into utf8mb4.
mysql> SHOW VARIABLES LIKE 'character_set%';
+--------------------------+----------------------------------------------------------+
| Variable_name | Value |
+--------------------------+----------------------------------------------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| character_sets_dir | /usr/local/Cellar/[email protected]/5.7.29/share/mysql/charsets/ |
+--------------------------+----------------------------------------------------------+
8 rows in set (0.00 sec)