Improvements for view layer

1. Inherited views

2. When we are using MVC
frameworks only view layer does
not correspond to the OO
principles

3. What frameworks give us
from the box
• view rendering
• partial rendering
• support of helper methods

4. Biggest disadvantage of
the view layer
• does not support unit testing

5. Disadvantages of helpers
• do not allow inheritance
• methods are calling without a receiver
• collision between helpers with similar methods

6. We can replace helpers to
decorators and improve
presentation logic

7. Advantages of decorators
• allow inheritance
• allow encapsulation
• friendly for unit testing
• does not mutate decorated object
• does not change the behavior of decorated object

8. Decorators has
advantages over helpers

9. But decorators are not
developed for view layer

10. View Components
next generation of view layer

11. Cells
view-model layer

12. Advantages of ‘cells’
• basically a small MVC stack
• own render engine
• OOP features
• separate presentation from the view logic

13. Benefits for application
structure
• slim controllers
• clear views
• maintainability

14. When do we need
such approach?

15. Cells applicable for
• layouts
• generic views
• complex view logic
• widgets

16. Simple example

17. Typical situation
• duplicated views for some UI
part
• each view can render specific
partials
• each partial can build specific
content

18. Every new case expects
change of current condition
state and file structure

19. Somebody should
maintain this stuff

20. To avoid this painful we
can use the power of
components

21. Defining base logic

22. Defining base partials

23. Inheriting our component

24. Customizing our partials

25. Calling our component

27. Conclusions
• separated from presentation logic
• easy maintenance
• test coverage
• isolated dependencies

28. –Valentyn Ostakh
Thanks!

29. Questions?