Symfony Live 2017 - Serializer

Transcript

1. SymfonyLive Paris 2017 The Serializer Component

2. I am Grégoire Pineau DevOps @blackfireio / @sensiolabs @symfony Core

   Contributor Github / Twitter : @lyrixx Hello! 2

3. 3 Serialization ?

4. “ Serialization is the process of translating data structures or

   object state into a format that can be stored and reconstructed later in the same or another computer environment. Adapted from en.wikipedia.org/wiki/Serialization 4

5. When? ◉ To store data in a DB (RDBMS, Redis,

   Elasticsearch) ◉ To send / receive data via an API ◉ To send / receive data via messaging system (AMQP) ◉ To detect changes in time-varying data 5

6. Why? ◉ PHP serialize / unserialize functions are powerful but:

   ◦ Not interoperable ◦ Not configurable 6

7. Different formats ◉ Binary: ◦ Faster ◦ Smaller ◦ Ex:

   protobuf, Apache Thrift, … ◉ Textual ◦ Human readable / editable ◦ Ex: CSV, JSON, XML, YAML, ... 7

8. symfony/serializer 8

9. History

10. Before symfony 2.7 ◉ JMSSerializer: ◦ Had more features ◦

    Had a better integration with others libs ◦ Was more used ◉ Symfony Serializer ◦ Was not really used 10

11. History 11

12. Symfony 2.7 & next ◉ Tons of new features ◉

    … and keeps counting ◉ Better integration with others lib ◉ Simpler than JMSSerializer (?) 12

13. Architecture

14. 14

15. 15 And Decoders Encoders

16. Encoders ◉ CsvEncoder ◉ JsonEncoder ◉ XmlEncoder ◉ YamlEncoder 16

17. Encoder usage 17

18. Decoder usage 18

19. 19

20. 20 And denormalizers Normalizers

21. Normalizers AbstractNormalizer, AbstractObjectNormalizer, ArrayDenormalizer, ContextAwareDenormalizerInterface, ContextAwareNormalizerInterface, CustomNormalizer, DataUriNormalizer, DateTimeNormalizer, DenormalizableInterface,

    DenormalizerAwareInterface, DenormalizerAwareTrait, DenormalizerInterface, GetSetMethodNormalizer, JsonSerializableNormalizer, NormalizableInterface, NormalizerAwareInterface, NormalizerAwareTrait, NormalizerInterface, ObjectNormalizer, PropertyNormalizer, SerializerAwareNormalizer 21

22. Object Normalizers GetSetMethodNormalizer Uses getters and setters PropertyNormalizer Uses Reflection

    CustomNormalizer Uses $object->normalize(); ObjectNormalizer Uses PropertyAccess Component 22

23. Extra Normalizer DateTimeNormalizer Turns DateTime into string DataUriNormalizer Turns SplFileInfo

    into data:uri ArrayDenormalizer Denormalizes arrays of objects JsonSerializableNormalizer Turns JsonSerializable into a string 23

24. Normalizer usage 24

25. Denormalizer usage 25

26. 26

27. 27 And deserializer Serializer

28. Serializer 28

29. Serializer Usage 29

30. Deserializer Usage 30

31. 31

32. symfony/symfony-demo 32

33. 33 https://github.com/symfony/symfony-demo

34. Enable the serializer 34

35. Let’s build an API on top of symfony/demo

36. Create a Controller 36

37. Try it 37

38. Configuration Groups 38

39. Groups ◉ Choose what property is (de) serialized ◉ Could

    be used: ◦ For read / write access ◦ For security (public, connected user, admin user) ◦ For API versioning 39

40. Groups 40

41. Tips Use the following format for your Groups: 41 GET

    /posts post_list_read GET /posts/12 post_read PUT /posts/12 post_write GET /posts/12/details post_details_read

42. Groups 42 Context

43. Configuration MaxDepth 43

44. MaxDepth 44

45. Configuration NameConverter 45

46. NameConverter Tweak the name of a property: ◉ By default,

    it uses the property name (CamelCase) ◉ Automatically convert to snake_case ◉ Rename / Alias some property 46

47. Try it again 47

48. Add more data ... … to the representation 48

49. Custom Object Normalizer ◉ Allow to tweak at PHP level

    the normalization ◉ Be able to add or remove some data: ◦ Canonical URL ◦ “Computed” data: the number of post’s comment 49

50. PostNormalizer 50

51. PostNormalizer 51

52. Custom Object Normalizer 52

53. Try it again 53

54. 54 Circular Reference

55. Circular Reference ◉ Example: “Post” has a one-to-many relation “Comment”.

    A “Comment” has a property “Post”. ◉ By default the serializer will throw an exception because of the circular reference ◉ But you can implement a Circular Reference Handler 55

56. Circular Reference 56

57. Circular Reference 57

58. Circular Reference SF 3.3 58

59. Circular Reference < SF 3.2 59

60. Deserialization Aka: How to use user data 60

61. Create a Controller 61

62. Create a Controller 62

63. ConstraintViolation ListNormalizer 63

64. Send invalid data 64

65. Send valid data 65

66. Deserialization Into an Object 66

67. Into an Object 67

68. Deserialization With some relations 68

69. Post Object 69

70. Enable the property info component 70

71. Try it! 71

72. Solution 72 You need to create a TagDenormalizer to handle

    the situation: search the tag in DB: ◉ If exists, uses it ◉ If not, create it

73. Deserialization Of array 73

74. The controller 74

75. Summary

76. 76

77. Summary 77 ◉ Use Groups ◉ Create a normalizer for

    each serialized entity ◦ Service tag: ‘serializer.normalizer’ ◉ Create a circular reference handler

78. Any questions ? @lyrixx Thanks! 78