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http://www.rubyconf.org.au We all use Bundler at some point, and most of us use it every day. But what does it do, exactly? Why do we have to use bundle exec? What's the point of checking in the Gemfile.lock? Why can't we just gem install the gems we need? Join me for a walk through the reasons that Bundler exists, and a guide to what actually happens when you use it. Finally, we'll cover some Bundler "pro tips" that can improve your workflow when developing on multiple applications at once.
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In the talk titled "How Does Bundler Work, Anyway?", presented by André Arko at RubyConf AU 2017, the speaker explores the functionality and underlying principles of Bundler, a crucial tool used for dependency management in Ruby. The presentation begins with an introduction to André Arko, who is deeply involved in Ruby development and co-authored 'The Ruby Way'. He provides a historical context for dependency management in Ruby, starting from the 'require' method to 'setup.rb', and then to the establishment of RubyGems and Bundler. Key points discussed include: - **Historical Overview**: The evolution of dependency management begins with the 'require' method, leading to the limitations of 'setup.rb', which lacked versioning and uninstallation capabilities. - **The Rise of RubyGems**: Introduced in 2003, RubyGems allowed for easier library installation with version management, but still faced issues with dependencies among multiple applications. - **Challenges with Dependency Conflicts**: As applications required different versions of gems, developers often faced conflicts that complicated software setup and development, especially when switching between projects. - **The Role of Bundler**: Bundler was created to resolve these issues by managing gem versions and dependencies in a more organized manner, allowing developers to specify the required gems and ensuring compatibility through the creation of a 'Gemfile.lock'. - **Functionality of Bundler**: The command 'bundle install' checks the defined dependencies in the Gemfile and installs the required versions. 'bundle exec' is highlighted as a command that runs programs under the context of the specified gems, ensuring the correct versions are used. - **Best Practices**: André shares tips such as using 'bundle binstubs' to create executable scripts that guarantee the correct gem versions are utilized, which is particularly beneficial when managing multiple Rails applications. In conclusion, André emphasizes the importance of Bundler in improving the Ruby development workflow and addresses the ongoing enhancements being made to this vital tool. The audience is encouraged to engage with him for further discussion and Ruby Together stickers, underscoring the collaborative spirit of the Ruby community.
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