Pure Sign Breakfast Presentations - Drupal FieldAPI

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Introduction to Drupal FieldAPI. Topics: The different abstractions behind the FieldAPI. The Drupal hooks needed to define your own custom Field. The advantages of creating fields using the Drupal FieldAPI.

Tecnología

toon@puresign.be
Drupal FieldAPI
@toonketels Pure Sign Breakfast Presentation 16/02/2012

Overview
‣ Entities
‣ Fields
‣ Anatomy of a ﬁeld
‣ Creating a new ﬁeldtype
‣ Why using the Field API
‣ Resources

Entities are the things, the data, the information,
the “stuff”, that we want do deal with in our
Drupal application.

http://www.istos.it/comment/2882

Entities

Entities
‣ An abstraction for content
‣ Entities & bundles
‣ Created because not everything is a
node
‣ What makes node powerful is their
ﬁeldability

The smallest data items we add to entities.

Fields

Field type

Field

Field instance

Layers of abstraction

Fields types
‣ Contains business logic of ﬁeld
‣ Is conserned with:
- What happens with data loaded
from storage layer?
- What should happen with data
inputted by user to storage layer?
‣ Examples:
- List
- Text
- Price
- Link

Fields
‣ Data structure holding some settings

‣ A name and a type
‣ Link: ﬁeld_website

‣ Some cannot be reverted, inﬂuence
on db

‣ Settings apply everywhere ﬁeld is
used

Field instance
‣ A ﬁeld attached to a bundle

‣ Adds bundle speciﬁc settings

‣ bundle_ﬁeldname

Field

Display
Input widget
formatter

Anatomy of a ﬁeld

3 parts
‣ Deﬁning a ﬁeld

‣ Deﬁning an input widget

‣ Deﬁning a formatter

Field
‣ hook_ﬁeld_info()
‣ hook_ﬁeld_schema()
‣ hook_ﬁeld_validate()
‣ hook_ﬁeld_is_empty()

Widget
‣ hook_ﬁeld_widget_info()
‣ hook_ﬁeld_widget_form()

Formatter
‣ hook_ﬁeld_formatter_info()
‣ hook_ﬁeld_formatter_view()

Reusability
‣ Module: enable on any site

‣ We deﬁne a type
‣ Can be attached to any entity
bundle
‣ User can customize it
‣ Create an instance

Pluggable ‣ Decoupling
architecture
‣ Field data
‣ Input widget
‣ Display

‣ Other devs can
‣ Create input widgets
‣ Create formatters
‣ Alter (alter hooks)

Storage ‣ We don’t write sql
agnostic
‣ Data retrieval done for us
‣ Only implement schema

‣ Storage engine independent

Settings for
free ‣ Settings for free
‣ Required
‣ Help text
‣ Defaults
‣ Single - multiple - max

UI
‣ Conﬁgure ﬁeld
‣ Input widget
‣ Selection of formatter

Views
integration ‣ Display ﬁeld
‣ Multiple ﬁeld settings
‣ Filter criteria
‣ compound_one
‣ compound_two
‣ delta
‣ Sort criteria
‣ compound_one
‣ compound_two
‣ delta

Display & DS ‣ Works with DS
‣ (better: DS works with ﬁelds)

Resources
‣ http://drupal.org/node/707832
‣ http://api.drupal.org/api/drupal/
modules!ﬁeld!ﬁeld.module/group/
ﬁeld/7
‣ http://api.drupal.org/api/examples/
ﬁeld_example
%21ﬁeld_example.module/7

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Pure Sign Breakfast Presentations - Drupal FieldAPI

1. toon@puresign.be Drupal FieldAPI @toonketels Pure Sign Breakfast Presentation 16/02/2012

2. Overview ‣ Entities ‣ Fields ‣ Anatomy of a ﬁeld ‣ Creating a new ﬁeldtype ‣ Why using the Field API ‣ Resources

3. Entities

4. Entities are the things, the data, the information, the “stuff”, that we want do deal with in our Drupal application. http://www.istos.it/comment/2882 Entities

5. Entities ‣ An abstraction for content ‣ Entities & bundles ‣ Created because not everything is a node ‣ What makes node powerful is their ﬁeldability

6. Fields

7. The smallest data items we add to entities. Fields

8. Field type Field Field instance Layers of abstraction

9. Fields types ‣ Contains business logic of ﬁeld ‣ Is conserned with: - What happens with data loaded from storage layer? - What should happen with data inputted by user to storage layer? ‣ Examples: - List - Text - Price - Link

10. Field types

11. Fields ‣ Data structure holding some settings ‣ A name and a type ‣ Link: field_website ‣ Some cannot be reverted, influence on db ‣ Settings apply everywhere field is used

12. Field

13. Field

14. Field

15. Field instance ‣ A field attached to a bundle ‣ Adds bundle specific settings ‣ bundle_fieldname

16. Field

17. Field

18. Anatomy of a Field

19. Field Display Input widget formatter Anatomy of a ﬁeld

20. Creating a new ﬁeldtype

21. 3 parts ‣ Defining a field ‣ Defining an input widget ‣ Defining a formatter

22. Field ‣ hook_field_info() ‣ hook_field_schema() ‣ hook_field_validate() ‣ hook_field_is_empty()

23. Widget ‣ hook_ﬁeld_widget_info() ‣ hook_ﬁeld_widget_form()

24. Formatter ‣ hook_ﬁeld_formatter_info() ‣ hook_ﬁeld_formatter_view()

25. Formatter

26. Code example

27. Why using the Field API

28. Why? ‣ It’s the way it goes...

29. Reusability ‣ Module: enable on any site ‣ We deﬁne a type ‣ Can be attached to any entity bundle ‣ User can customize it ‣ Create an instance

30. Pluggable ‣ Decoupling architecture ‣ Field data ‣ Input widget ‣ Display ‣ Other devs can ‣ Create input widgets ‣ Create formatters ‣ Alter (alter hooks)

31. Storage ‣ We don’t write sql agnostic ‣ Data retrieval done for us ‣ Only implement schema ‣ Storage engine independent

32. Settings for free ‣ Settings for free ‣ Required ‣ Help text ‣ Defaults ‣ Single - multiple - max

33. Settings for free

34. Single multiple, max number

35. Consistent UI build for us

36. UI ‣ Conﬁgure ﬁeld ‣ Input widget ‣ Selection of formatter

37. Views integration

38. Views integration ‣ Display ﬁeld ‣ Multiple ﬁeld settings ‣ Filter criteria ‣ compound_one ‣ compound_two ‣ delta ‣ Sort criteria ‣ compound_one ‣ compound_two ‣ delta

39. Features exportability

40. Display & DS ‣ Works with DS ‣ (better: DS works with ﬁelds)

41. Resources

42. Resources ‣ http://drupal.org/node/707832 ‣ http://api.drupal.org/api/drupal/ modules!field!field.module/group/ field/7 ‣ http://api.drupal.org/api/examples/ field_example %21field_example.module/7

43. toon@puresign.be @toonketels Questions?

Pure Sign Breakfast Presentations - Drupal FieldAPI

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