02. One To One: The relationship and inserting

03. One To One: Reverse relationship

04. One To One: A user has a unique token

05. One To Many: A user has many topics

06. One To Many: A topic has many posts

07. One To Many: A note on default column names

08. Many To Many: Implementation

09. Many To Many: Inserting many-to-many

10. Many To Many: Default table and column names

11. Many To Many: Dates on pivots

12. Many To Many: Pivot filtering

13. Has Many Through: Implementation

14. Advanced Has Many Through: Setup and problem

15. Advanced Has Many Through: A quick guide to SQL views

16. Polymorphic basics: How you might do this

17. Polymorphic basics: Implementation

18. Polymorphic basics: Inserting on polymorphic relations

19. Polymorphic basics: Custom polymorphic types

20. Dynamic Polymorphic Rendering: Showing all comments on any model by a user

21. Many To Many Polymorphic: Setup

22. Many To Many Polymorphic: Relationships

23. Many To Many Polymorphic: Inserting, updating and deleting

24. Many To Many Polymorphic: Showing topics and lessons under a tag

25. Many To Many Polymorphic: Showing all model types in one list