Problem

In the edge version of rails (active_record), an error occurs when defining a boolean column for mysql.

Error:  Trilogy::QueryError: 1064: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(1)' at line 1 (trilogy_query_recv)

Error Cause

Edge rails has changed from tinyint to using the boolean type.
rails/rails#54144

On the other hand, ridgepole applies limit(1) to boolean types.

This will cause a SQL with limit(1) to be issued for the boolean type, resulting in a syntax error.

Workaround

Execute ridgepole with the --default-bool-limit 0 option.
This is not a backward-compatible support, so you need to use different options depending on the version of rails you are using.