ErrorMsg - to handle HTML + JSON.

Geocoding - struct for address.

Geometry - struct for latitude and longitude.

Hobby model - `hobbies` table.

Post model - `posts` table.

RedisData - key:value.

RedisDataHash - key:hashValues.

RedisDataHashValue - values.

User model - `users` table.

UserHobby model - intermediate table `user_hobbies` (many to many relations).