Mastering the Symfony Serializer

@dunglas - Les-Tilleuls.coop Mastering the Symfony Serializer 1

@dunglas - Les-Tilleuls.coop Kévin Dunglas ❏ Co-founder of Les-Tilleuls.coop ❏
Symfony Core Team (Serializer, PropertyInfo, WebLink, autowiring, PSR-7 Bridge…) ❏ Creator of API Platform 2 @dunglas

@dunglas - Les-Tilleuls.coop Dev, consulting and training (Masterclass) Self-managed since
2011 ⬆ 97% in 2016, 25 people sharing benefits ➡ jobs@les-tilleuls.coop Les-Tilleuls.coop 3

@dunglas - Les-Tilleuls.coop Introduction 4

@dunglas - Les-Tilleuls.coop The Serializer component is meant to be
used to turn objects into a specific format (XML, JSON, YAML, ...) and the other way around. 5 “ ”

@dunglas - Les-Tilleuls.coop Most popular use case: retrieve/send data from/to
external systems ❏ Create web APIs ❏ Hydrate objects from DB results or external API responses ❏ Exchange data between apps (or [micro]services) 6

@dunglas - Les-Tilleuls.coop They Use the Serializer Component 7 New
in Symfony 4.1: the Messenger component also uses the Serializer

@dunglas - Les-Tilleuls.coop 8 Now 14,735 LOC History

@dunglas - Les-Tilleuls.coop Architecture 9

@dunglas - Les-Tilleuls.coop Normalization and Encoding 10

@dunglas - Les-Tilleuls.coop ChainNormalizer and ChainEncoder ❏ A list of
normalizers and encoders are passed to the Serializer’s constructor ❏ The 1st implementation having a supports* method returning true is used ❏ Extension point to register custom implems for specific classes or formats 11

@dunglas - Les-Tilleuls.coop Basic Usage 12

@dunglas - Les-Tilleuls.coop Standalone Installation 13

@dunglas - Les-Tilleuls.coop Basic Initialization 14

@dunglas - Les-Tilleuls.coop Basic Usage: Serialization 15

@dunglas - Les-Tilleuls.coop Basic Usage: Deserialization 16

@dunglas - Les-Tilleuls.coop Alternatives? 17

@dunglas - Les-Tilleuls.coop Why Not PHP’s (un)?serialize? 18

@dunglas - Les-Tilleuls.coop Why Not PHP’s (un)?serialize? Super fast, and
preserve types, but… ❏ Not interoperable ❏ Not secure for non-internal use ↓ 19

@dunglas - Les-Tilleuls.coop Why Not PHP’s (un)?serialize? 20

@dunglas - Les-Tilleuls.coop Why Not json_(en|de)code? 21

@dunglas - Les-Tilleuls.coop Why Not json_(en|de)code? ❏ Cannot hydrate non-anonymous
objects when decoding ❏ Limited feature set (groups, circular references, trees…) Symfony Serializer’s JSON encoder uses json_encode/json_decode internally. 22

@dunglas - Les-Tilleuls.coop Serialization: From a PHP Object to an
Open Format 23

@dunglas - Les-Tilleuls.coop A Dummy Object 24

@dunglas - Les-Tilleuls.coop From an object, to an associative array
Normalization 25

@dunglas - Les-Tilleuls.coop Normalization: From an Object To an Array
26

@dunglas - Les-Tilleuls.coop The Serializer is also a Normalizer 27

@dunglas - Les-Tilleuls.coop From an array, to the output format
Encoding 28

@dunglas - Les-Tilleuls.coop Encoding: From an Array to a String
29

@dunglas - Les-Tilleuls.coop The Serializer is also an Encoder 30

@dunglas - Les-Tilleuls.coop Normalization => Encoding Serialization 31

@dunglas - Les-Tilleuls.coop Serialization: Normalization + Encoding 32

@dunglas - Les-Tilleuls.coop Deserialization: From an Open Format To a
PHP Object 33

@dunglas - Les-Tilleuls.coop From a String to an Array Decoding
34

@dunglas - Les-Tilleuls.coop Decoding: From a String to an Array
35

@dunglas - Les-Tilleuls.coop The Serializer is also a Decoder 36

@dunglas - Les-Tilleuls.coop From an Array to an Object Denormalization
37

@dunglas - Les-Tilleuls.coop Denormalization: From an Array to an Object
38

@dunglas - Les-Tilleuls.coop The Serializer is also a Denormalizer 39

@dunglas - Les-Tilleuls.coop Decoding => Denormalization Deserialization 40

@dunglas - Les-Tilleuls.coop Deserialization: Decoding + Denormalization 41

@dunglas - Les-Tilleuls.coop Different kinds of Object Normalizers 42

@dunglas - Les-Tilleuls.coop Native Object Normalizers 43 Access Data Supports
Dependencies PropertyNormalizer Public properties - GetSetMethodNormalizer get / set, is / has - ObjectNormalizer Public properties get / set, is / has add / remove __call (opt-in) __get (opt-in) symfony/property-access optional, but boosts perf: symfony/cache ObjectNormalizer is the smartest generic normalizer. It is enabled by default when using Symfony full stack.

@dunglas - Les-Tilleuls.coop 44

@dunglas - Les-Tilleuls.coop An Object Mixing Public Props and Accessors
45

@dunglas - Les-Tilleuls.coop An Object Mixing Public Props and Accessors
Unfortunately neither PropertyNormalizer nor GetSetMethodNormalizer can deal with this object. ObjectNormalizer can! 46

@dunglas - Les-Tilleuls.coop ObjectNormalizer: The Power of PropertyAccess 47

@dunglas - Les-Tilleuls.coop Normalizers for Specific Types 48

@dunglas - Les-Tilleuls.coop Normalizers for Special Objects 49 Supported Objects
Dependency DataUriNormalizer File <-> data: URI \SplFileInfo \SplFileObject HttpFoundation’s File optional, to guess MIME types: symfony/ http-foundation DateIntervalNormalizer Date interval <-> ISO 8601 string \DateInterval - DateTimeNormalizer Date & time <-> ISO 8601 string \DateTimeInterface - Since 4.1 ConstraintViolationListNormalizer Validation errors -> RFC 7807 (API Problem Details) Validator’s ConstraintViolationListInterface symfony/validator JsonSerializableNormalizer Json_encode’s like JsonSerializable \JsonSerializable - They are all available by default when using the Symfony full stack framework.

@dunglas - Les-Tilleuls.coop Adding More Properties to Our Class 50

@dunglas - Les-Tilleuls.coop Registering and Using Specific Normalizers 51

@dunglas - Les-Tilleuls.coop Recursive Normalization: Thanks to the Chain of
Responsibility ❏ Generic object normalizers implement the SerializerAwareInterface ❏ They recursively call Serializer::normalize() for all values they normalize 52

@dunglas - Les-Tilleuls.coop Recursive Normalization: Thanks to the Chain of
Responsibility In our previous example: ❏ Conference is normalized by ObjectNormalizer ❏ Because supportsNormalization() method of normalizers registered before it return false ❏ DateTime by DateTimeNormalizer ❏ SplFileObject by DataUriNormalizer 53

@dunglas - Les-Tilleuls.coop Built-In Encoders 54

@dunglas - Les-Tilleuls.coop Built-In Encoders and Decoders 55 Format Dependencies
JsonEncoder JSON - XmlEncoder XML - CsvEncoder CSV - YamlEncoder YAML symfony/yaml They are all available by default when using the Symfony full stack framework.

@dunglas - Les-Tilleuls.coop Registering All Built-In Encoders 56

@dunglas - Les-Tilleuls.coop XML 57

@dunglas - Les-Tilleuls.coop CSV 58

@dunglas - Les-Tilleuls.coop YAML 59

@dunglas - Les-Tilleuls.coop Select just some properties Serialization Groups 60

@dunglas - Les-Tilleuls.coop Defining The Groups 61 XML, YAML and
plain PHP are also supported

@dunglas - Les-Tilleuls.coop Providing Metadata 62

@dunglas - Les-Tilleuls.coop Serialization Group: conference:list 63

@dunglas - Les-Tilleuls.coop Serialization Group: conference:item 64

@dunglas - Les-Tilleuls.coop Serialization Groups: None (default behavior) 65

@dunglas - Les-Tilleuls.coop Do you know GraphQL? Select Specific Attributes
66

@dunglas - Les-Tilleuls.coop Select Specific Attributes 67

@dunglas - Les-Tilleuls.coop Array Denormalization 68

@dunglas - Les-Tilleuls.coop Registering the ArrayDenormalizer 69

@dunglas - Les-Tilleuls.coop Using The Array Denormalizer 70

@dunglas - Les-Tilleuls.coop Recursive Denormalization 71

@dunglas - Les-Tilleuls.coop Recursive Denormalization Recursive normalization works out of
the box (thanks to the SerializerAwareInterface). Unfortunately, this is not the case for denormalization: 72

@dunglas - Les-Tilleuls.coop Recursive Denormalization The Serializer cannot guess that:
❏ date must be denormalized as a \DateTime (and not a string) ❏ logo as a \SplFileObject (and not a string) 73

@dunglas - Les-Tilleuls.coop PropertyInfo: Type Metadata Sources 75 Dependencies Getter
/ Setter / Adder / Remover / Constructor - PHPDoc phpdocumentator/reflection-docblock Doctrine ORM mappings symfony/doctrine-bridge Optional but boosts perf: symfony/cache

@dunglas - Les-Tilleuls.coop Adding Type Metadata 76

@dunglas - Les-Tilleuls.coop Registering the PropertyInfo Type Extractor 77

@dunglas - Les-Tilleuls.coop Using Recursive Denormalization 78 Recursive array denormalization
is also supported ✌

@dunglas - Les-Tilleuls.coop Type Safety 79

@dunglas - Les-Tilleuls.coop Type Safety Bonus: If a PropertyInfo Type
extractor is registered, the built-in object normalizers will also ensure that the type of the data to deserialize matches the intended one! 80

@dunglas - Les-Tilleuls.coop Type Safety 81 This behavior can be
disabled with the ObjectNormalizer::DISABLE_TYPE_ENFORCEMENT context key.

@dunglas - Les-Tilleuls.coop Updating an Existing Object 83

@dunglas - Les-Tilleuls.coop Updating an Existing Object 84

@dunglas - Les-Tilleuls.coop The Perfect Match for Value Objects Hydrating
Through the Constructor 85

@dunglas - Les-Tilleuls.coop Hydrating Through the Constructor 86

@dunglas - Les-Tilleuls.coop Providing Default Values (new in 4.1) 87

@dunglas - Les-Tilleuls.coop Circular References 88

@dunglas - Les-Tilleuls.coop A Model with a Circular Reference (avoid
when you can) 89

@dunglas - Les-Tilleuls.coop Better Than an Infinite Recursion... 90

@dunglas - Les-Tilleuls.coop Registering a Handler 91

@dunglas - Les-Tilleuls.coop Configuring the Trigger Limit 92

@dunglas - Les-Tilleuls.coop Trees and Max Depth 93

@dunglas - Les-Tilleuls.coop A Tree, with a Serialization Max Depth
94

@dunglas - Les-Tilleuls.coop Serializing Tree With Max Depth 95

@dunglas - Les-Tilleuls.coop New in 4.1: Registering a Handler 96

@dunglas - Les-Tilleuls.coop Abstract Classes 97

@dunglas - Les-Tilleuls.coop Creating Custom Normalizers 98

@dunglas - Les-Tilleuls.coop A Normalizer For a Specific Class 99

@dunglas - Les-Tilleuls.coop Registration and Usage 100 ❏ Conference instances
will be normalized by the ConferenceNormalizer ❏ All other objects by the PropertyNormalizer ❏ Order matters!

@dunglas - Les-Tilleuls.coop Symfony 4 Integration 101

@dunglas - Les-Tilleuls.coop Typehint SerializerInterface anywhere, A fully featured Serializer
is injected: ❏ All built-in normalizers and encoders ❏ PropertyInfo and PropertyAccess related features ❏ MetadataLoader with annotation, XML and YAML support 102

@dunglas - Les-Tilleuls.coop 103 Merci joind.in/talk/bbc64 A demain, 9h30 salle
Jarvis

@dunglas - Les-Tilleuls.coop Also New in Symfony 4.1 ❏ Support
for abstract classes (DiscriminatorMap) ❏ Massive performance improvements (+30%) ❏ Bunch of new options for the XML and CSV encoders 104

@dunglas - Les-Tilleuls.coop A True Alternative: jms/serializer 105 Symfony JMS
Pattern normalizer + encoder Chain of responsibility Visitor License MIT: permissive, compatible with most other (F)OSS licenses Apache v2: permissive, but incompatible with GPLv2 (Drupal, Wordpress, Joomla) V2 will be MIT: schmittjoh/serializer#950 Formats Core: JSON, XML, YAML, CSV, data: URI, RFC7807, ISO8601 API Platform: JSON-LD, HAL, Swagger, Hydra JSON, XML Maintainers SF Core Team (15 people) 2 people (1 active) Release process Semver, guaranteed upgrade path, time based release, strong BC policy Semver

Mastering the Symfony Serializer

Mastering the Symfony Serializer

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