Mysql2::Error: Incorrect string value

Question

I have a rails application running on production mode, but all of the sudden this error came up today when a user tried to save a record.

Answer 1

Need to change CHARACTER SET and COLLATE for already created database:

ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_unicode_ci;

Or it was necessary to create a database with pre-set parameters:

CREATE DATABASE databasename CHARACTER SET utf8 COLLATE utf8_general_ci;