CLI Data Gem Walkthrough

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Building a CLI Gem Walkthrough

This video walks through the process of planning and building a CLI gem. There will be more videos on the process of building a more complex gem as well as on refactoring and improving a CLI gem.

Objectives

Planning your application
Generating and setting up a basic gem
Basic CLI User interface
Setting up your Objects
Setting up your Scraper
Bring it all together!

Video

Summary

Planning the gem.
Beginning the building process.
- Setting up or generating the basic structure of the gem.
- Creating and stubbing out the executable file.
requiring files with require and require_relative.
Coding the CLI class — our controller.
- Stubbing out the CLI class with hard-coded return data.
- Creating the menu.
Setting up our Deal class.
- #today method to return today's deals.
- Stubbing out our first Deal instances with hard-coded data.
- Setting up the Deal class attributes.
Testing our data in the console.
Wire up our menu with conditional logic to work with our array of deals.
- Iterate over and display deals.
- Fix spelling on #availability.
Setting up our scraper class — should we use a Deal class method or a standalone class?
- Set up Deals#scrape_deals method.
Adding gem dependencies to the app.
- Add dependencies to gemspec.
- Development dependencies or runtime dependencies?
Code individual scrape methods for each site.
- Use CSS selectors to scrape desired information.
- Create new Deal objects and set the attributes based on the scraped info.
- Update logic for #availability.
Final thoughts and tips on the building process.

Code

PreviousCLI Data Gem Portfolio Project NextCLI Data Gem Walkthrough: Creating a CLI Scraper Gem

Last updated 5 years ago