Advanced ActiveRecord Querying / Advanced Activerecord Querying Belongs_to Associations

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This coding exercise comes from Upcase, the online learning platform we run. It's part of the Advanced ActiveRecord Querying course and is just one small sample of all the great material available on Upcase, so be sure to visit and check out the rest.

Exercise Intro

In this exercise, you'll be using ActiveRecord's join and merge methods to query your belongs_to associations in an object-oriented, composable way.

Instructions

To start, you'll want to clone and run the setup script for the repo

git clone git@github.com:thoughtbot-upcase-exercises/advanced-activerecord-querying-belongs_to-associations.git
cd advanced-activerecord-querying-belongs_to-associations
bin/setup

After cloning and running bin/setup:

  • Take a look in db/schema.rb to get a sense of the database schema you'll be querying.
  • Take a look at the classes in app/models to get familiar with the models and associations you'll be working with.
  • Edit spec/models/location_spec.rb and remove the pending line from the spec.
  • Edit app/models/location.rb and implement in_region to get the spec passing.
  • Edit spec/models/person_spec.rb and repeat the above process for each pending spec.

You can run rake to re-run the tests at any time.

Once all the tests are passing (and there are no pending specs), you're all set!

Tips and Tricks

Watch the trail video on querying belongs_to associations and check out the documentation for joins and merge.

Featured Solution

Check out the featured solution branch to see the approach we recommend for this exercise.

Forum Discussion

If you find yourself stuck, be sure to check out the associated Upcase Forum discussion for this exercise to see what other folks have said.

Next Steps

When you've finished the exercise, head on back to the Advanced ActiveRecord Querying course to find the next exercise, or explore any of the other great content on Upcase.

License

advanced-activerecord-querying-belongs_to-associations is Copyright © 2015-2018 thoughtbot, inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.

Credits

thoughtbot

This exercise is maintained and funded by thoughtbot, inc.

The names and logos for Upcase and thoughtbot are registered trademarks of thoughtbot, inc.