Refactor How Weekly Mileage is Calculated

In this video, we refactor how weekly mileage is calculated by adding a new column to the activities table to store the distance in miles.

Source Code

https://github.com/stevepolitodesign/stridecatcher/commit/9237bd086fc19b1c6964cc310b56e8949b71ba33

Resources

https://api.rubyonrails.org/classes/ActiveRecord/Calculations.html#method-i-sum

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