What happens if Gem has a different mysql dependency? is it worth the trouble?

Question

Ruby on Rails

I am writing gem.
This gem needs a db.
But I had a reasonable question, what will happen if the versions of the muscle or postgres intersect with the application.
What do they do in this case?

Answer 1

In a gemspec, you specify a dependency on other gems, indicating the desired version. When installing your gem along with other gems, bundler finds and installs a dependency version that satisfies all requests from all gems and requests from the Gemfile.
If such a version is not found, then a conflict will arise, about which the bundler will inform you.
For example, in the gem 'your_gem' you have specified the dependency and in the gem file of the application

gem  'your_gem'
gem  'pg', '= 9.2' # Будет конфликт т.к. your_gem требует pg > 9.2
gem  'pg', '>= 9.2' # Конфликта нет, установится последняя версия >= 9.5

Read about dependency syntax here: guides.rubygems.org/patterns
It is also useful to get acquainted with the concept of semantic versioning