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1. Check out the repo and get it running
2. Bugfix: Quantity does not work properly when creating invoices
3. Discussion: Analyse the invoice model, what should we do

• Rename the variable names in there
• Can we add a comment to clear things up?

4. Refactoring/basic dev: Break line items out into separate model

• Validations
• Data consistency

4. Discussion: If the invoice needed to be deployed to an external service, how would you structure it? e.g. Endpoint to create invoices
   • Sends invoices to emails
   • Sends invoices to xero client
   • Charged invoice through some payments service
5. Bugfix: Invoice shows NaN if non numeric input is given to line items
6. Development: Invoice needs a total cost stored
7. Discussion: Should we store total cost or not? What would you use (Money gem, other)?
8. Bugfix: On list page, number of line items is not showing properly
9. Dev/discussion: Test Invoice class

• Unit testing
• Integration testing
• End to end testing

10. Discussion: How would you restructure things