MySQL: 𠮷（つちよし）

データベース/テーブル utf8mb4にすること

ALTER TABLE customers_customer CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

確認:

$ echo "show variables like 'character%';" | python manage.py dbshell

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    utf8mb3
character_sets_dir      /rdsdbbin/mysql-8.0.28.R4/share/charsets/

character_set_system utf8mb3 が問題

接続 を utf8mb4 にすること

django: OPTIONS/charset=utf8mb4

In [1]: from django.conf import settings

In [2]: settings.DATABASES
Out[2]:
{'default': {'ENGINE': 'django.db.backends.mysql',
  'HOST': 'prod-db-instance.xxxxxxxx.ap-northeast-1.rds.amazonaws.com',
  'NAME': 'coresys_masters',
  'USER': 'coresys_masters',
  'PASSWORD': 'va0Gaighoo3Paez8',
  'OPTIONS': {'charset': 'utf8mb4',
   'init_command': "SET sql_mode='STRICT_TRANS_TABLES'"},
  'ATOMIC_REQUESTS': False,
  'AUTOCOMMIT': True,
  'CONN_MAX_AGE': 0,
  'TIME_ZONE': None,
  'PORT': '',
  'TEST': {'CHARSET': None,
   'COLLATION': None,
   'MIGRATE': True,
   'MIRROR': None,
   'NAME': None}}}