Discussion of one type of many-to-many relationship. We are going to use checkboxes in the UI to allow the user to select multiple related "Conditions" in the Patient's medical history.<br />0:00 Many to Many Discussion (No Payload)<br />8:10 Add/Modify the Models<br />10:35 Changes in DbContext-Cascade Delete?<br />12:25 Add a new Migration<br />14:30 Seed data for the m:m<br />21:15 Don't see the new data yet.<br />22:30 Modify Index, Details and Delete Views<br />26:00 Still no data!?! - Missing .Include().ThenInclude()<br />28:55 Maintain the m:m in Create and Edit Patient<br />31:00 ViewModel for a Checkbox<br />33:45 Controller methods for the checkboxes.<br />38:40 Create Process - Patient Get<br />45:40 Post for Patient Create<br />49:20 catch for the Transaction
