Why is my Rails app getting a 'mysql2' gem compilation error, and how can I fix it?

Compiling Issue with 'mysql2' Gem: Resolving Library Compatibility

When connecting to a MySQL server via a Rails application, you may encounter an error indicating an incorrect MySQL client library version. This error arises when the pre-compiled 'mysql2' gem used by the application is incompatible with the installed MySQL client library.

Solution:

To resolve this issue, you can uninstall and reinstall the 'mysql2' gem. This will automatically download and install a compatible version for your system. Follow the steps below:

From your Rails application directory, execute the following commands:

> gem uninstall mysql2

Confirm the uninstallation if prompted.

> bundle install

This command will fetch the gem metadata, install the dependencies, and build the native extensions for 'mysql2'.

Upon completion, the issue will be resolved, allowing you to connect to the MySQL server without encountering the library compatibility error.

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