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

1. Planning your application

2. Generating and setting up a basic gem

3. Basic CLI User interface

4. Setting up your Objects

5. Setting up your Scraper

6. Bring it all together!

Video

<iframe width="100%" height="720" src="https://www.youtube.com/embed/_lDExWIhYKI?rel=0&showinfo=0" frameborder="0" allowfullscreen></iframe>

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

• Daily Deals Gem repository

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