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Add Uniqueness Scope to Totals Model

In this video, we ensure a total record is unique across the user, starting_on value, and range value.

Source Code

• https://github.com/stevepolitodesign/stridecatcher/commit/3abe6d9cf877a3ca5771a73cd7efcecabc690bae

Resources

• https://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#method-i-validates_uniqueness_of
• https://guides.rubyonrails.org/active_record_migrations.html#using-the-change-method

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