Alex Shmatko questions

• How to make Dropdown button that changes its title have different links?
• How do I check all the gems with its versions in my Rails project?
• How to delete specific lines in text file?
• Is there a way to resolve Rails deleted migrations?
• DEPRECATION WARNING: alias_method_chain is deprecated
• Missing `secret_token` and `secret_key_base` for 'development' environment, set these values in `config/secrets.yml`
• How can I increase the size of a bootstrap button?

Alex Shmatko answers