The document provides an overview of the Yii framework, emphasizing its features such as request handling, routing, and error handling. It discusses the interaction between various elements in Craft CMS and the significance of modules and plugins in its architecture. Additionally, it covers how requests are processed within Craft CMS and the distinction between plugins and modules.

1. deep dive

2. deep dive[0] Introduction
$presentation = array(
'Introduction',
'Yii',
'Request Handling',
'Data Structure',
'Module & Plugin Overview',
'Q&A'
);

3. deep dive[1] Yii

4. deep dive[1] Yii
Yii is an object-oriented
model-view-controller
framework for PHP.

5. deep dive[1] Yii

6. deep dive[1] Yii
}

7. deep dive[1] Yii
Yii provides a way for
namespaces applications to
interact with each other.

8. deep dive[1] Yii
Yii provides routing.

9. deep dive[1] Yii
Yii provides twig.

10. deep dive[1] Yii
Yii provides error handling.

11. deep dive[1] Yii
Yii provides events.

12. deep dive[1] Yii
provides it's own routing.
🖕🖕

13. deep dive[1] Yii
provides its own twig.
🖕🖕

14. deep dive[1] Yii
doesn't provide it's
own error handling.
👍 👍

15. deep dive[1] Yii
doesn't provide it's
own events.
👍 👍

16. deep dive[1] Elements
use craftservicesElements;

17. deep dive[1] Elements
In Craft almost
everything is an element.

18. deep dive[2] Request Handling
Let's look at an incoming
Craft request.

19. deep dive
0.
The request will only go to
craft if the server routes it
to the index.php file.
[2] Request Handling

20. deep dive
1. Is it an action?
If the URL begins with
actions/ it gets routed to a
controller.
[2] Request Handling

21. deep dive
1. Is it an action?
The controller is either
built-in, or provided by a
module or plugin.
[2] Request Handling

22. deep dive
namespace craftcontrollers;
use Craft;
class UsersController extends Controller
{
public function actionLogin()
{
if (!Craft::$app->getUser()->getIsGuest()) {
// Too easy.
return $this->_handleSuccessfulLogin(false);
}
}
}
1. Is it an action?
The controller is
either built-in, or
provided by a
module or plugin.
GET /actions/users/active
POST /
<input type="hidden" name="action" value="users/save-user">
[2] Request Handling

23. deep dive
2. Is it an element?
Does it match an element's URI?
[2] Request Handling

24. deep dive
element:
a thing that can hold data
craftelementsAsset
craftelementsCategory
craftelementsEntry
craftelementsGlobalSet
craftelementsMatrixBlock
craftelementsTag
craftelementsUser
verbbsupertableelementsSuperTableBlockElement
[2] Request Handling

25. deep dive
craft_elements
id 28
fieldLayoutId 31
type craftelementsEntry
enabled 1
craft_elements_sites
id 32
elementId 28
siteId 1
slug about-us
uri company/about-us
[2] Request Handling

26. deep dive
craft_elements
id 28
fieldLayoutId 31
type craftelementsEntry
enabled 1
[2] Request Handling

27. deep dive
craft_elements
id 28
fieldLayoutId 31
type craftelementsEntry
enabled 1
craft_elements_sites
id 32
elementId 28
siteId 1
slug about-us
uri company/about-us
routing uri
[2] Request Handling

28. deep dive
3. Does the URI match a
route or URI rule?
return [
// Route blog/archive/YYYY to a controller action
'blog/archive/<year:d{4}>' => 'controller/action/path',
// Route blog/archive/YYYY to a template
'blog/archive/<year:d{4}>' => ['template' => 'blog/_archive'],
];
config/routes.php
<h1>Blog Entries from {{ year }}</h1>
[2] Request Handling

29. deep dive
4. Does the URI match a template?
@webroot/templates/single.twig
[2] Request Handling

30. deep dive
4. Does the URI match a template?
@webroot/templates/single.twig
Yii alias
[2] Request Handling

31. deep dive
5.Well I guess we'll just 404.
[2] Request Handling

32. deep dive[3] Data Structure
Let's visualize the
CraftCMS DB Structure

34. deep dive
Ok maybe let's not do that.
[3] Data Structure

35. deep dive
Let's look at the
Wordpress schema.
[3] Data Structure

37. deep dive[4] Module & Plugin Overview
Not suited for the complex
content architecture we require.

38. deep dive[4] Module & Plugin Overview
Let's talk about plugins.

39. deep dive
Plugins and modules are
basically justYii modules
(sort of like Craft is!)
[4] Module & Plugin Overview

40. deep dive
Plugins:
Installed through Composer,
can be turned on and off in admin.
(Usually) site-agnostic functionality
Modules:
Hardcoded into composer andYii
configs. Cannot be turned off in admin.
(Usually) site-specific functionality
[4] Module & Plugin Overview

41. deep dive[4] Module & Plugin Overview

42. deep dive
This is meta because Craft implements
all of these things on its own.
[4] Module & Plugin Overview

43. deep dive
CSS, JS, and Images needed in the
Admin side of Craft
[4] Module & Plugin Overview

44. deep dive
Tasks that can be run through
the Craft CLI
[4] Module & Plugin Overview

45. deep dive
Endpoints that are accessible
through a URL path
[4] Module & Plugin Overview

46. deep dive
Main application class file.
Registers hooks, events, etc
[4] Module & Plugin Overview

47. deep dive
New elements (like SuperTable
Blocks for example)
[4] Module & Plugin Overview

48. deep dive
New fields (like a markdown
editor that stores HTML)
[4] Module & Plugin Overview

49. deep dive
New queued tasks (like image
transformation)
[4] Module & Plugin Overview

50. deep dive
Installation / uninstallation
migrations
[4] Module & Plugin Overview

51. deep dive
A "template" for a custom data
structure
[4] Module & Plugin Overview

52. deep dive
A way to represent data
from a model and define
how it is stored / retrieved in
the DB
[4] Module & Plugin Overview

53. deep dive
The "business logic" of the
application/plugin/module
[4] Module & Plugin Overview

54. deep dive
Twig templates for the admin
side of your plugin
[4] Module & Plugin Overview

55. deep dive
Functional additions toTwig
(like twig-dig!)
[4] Module & Plugin Overview

56. deep dive
Add twig pages that appear
under "Utilities" in the Admin
[4] Module & Plugin Overview

57. deep dive
Add custom twig variables
accessible under the craft
namespace. (Like
{{ craft.testvariable }})
[4] Module & Plugin Overview

58. deep dive
Widgets for the admin dashboard.
[4] Module & Plugin Overview

59. deep dive[5] Q & A
Q&A