Rails：为什么“ rake secret”给我一个错误？

Question

I'm trying to run the rake secret command when I get this error:

rake aborted!
NameError: uninitialized constant Mysql2::Client::SECURE_CONNECTION
/Users/myuser/dev/myapp/config/application.rb:7:in `<top (required)>'
/Users/myuser/dev/myapp/config/Rakefile:5:in `require'
/Users/myuser/dev/myapp/config/Rakefile:5:in `<top (required)>'

I've got the latest version of mysql and the gem mysql2. Has anyone else stumbled upon this issue recently? Most posts on this topic I've found here are some five years old and doesn't fix this problem.

Answer 1

Answering my own question here. This problem was caused by a mismatch between the mysql2 gem version (0.3.18) and the version specified in the gemfile (0.3.16).