1. Form%Component%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

2. An%Object%
Domain%Model%PaCern%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

3. What%is%an%Object%?%
• Instance%of%a%class%definiHon%
• Related%to%others%objects%
– SeCer%and%GeCer%to%assign%values%
– Values%stored%with%properHes%
• Contains%methods%%
%
Data$Object$ Service$Object$
$ $
• Hold%Business%Data% • Hold%configura-on%data%
• An%object%has%not%informaHon%about%how% • Know%how%to%manipulate%data%
data%are%loaded.%(Does%not%know%what%an% • In%most%case,%only%one%instance%of%a%
«%id%»%is%)% service.%All%services%are%available%through%
• Many%instance%of%the%same%class% the%Service%Container%%
definiHon.% • This%is%not%a%singleton!%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

4. Data%Object%:%Car%Sample%
• A%car%has%
– A%name%
• A%car%is%linked%to%
– A%main%Engine%:%inline%ediHon%
– A%creaHon%date%
• A%Engine%has%%
– A%name%
– A%power%value%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

5. PropertyPath%&%PropertyPathMapper%
• PropertyPath%
– Read%and%write%a%property%from%an%object%
– Use%the%PHP%ReflecHon%API%
• PropertyPathMapper%%
– Iterate%across%form%definiHon%to%map%:%
• Data%to%Form%
• Form%to%Data%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

6. DataTransformer%
• Transform%the%data%into%an%internal%
representaHon%(PHP)%into%a%Form%
representaHon%(human).%%
– DateTime%instance%to%«%30/11/1981%»%
– Main%transformers%:%DateTimeTransformer,%
EnHtyTransformer,%ChoiceTransformer,%etc%…%
• 2%Methods%%
– transform%:%php%=>%human%
– reverseTransform%:%human%=>%php%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

7. Form%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

8. Standard%Form%Lifecycle%
CreaHon% DefiniHon% Binding% View%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

9. Symfony%Form%Lifecycle%
FormFactory% FormBuilder% Form% FormView%
Type%
FormBuilder% Type%
createBuilder%
getForm% buildView%
buildForm%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

10. Key%objects%
• FormFactory$(service)%
– Contains%all%types%available%(tag%form.type)%
• FormBuilder%(data)%
– Contains%nested%informaHon%about%the%form%elements%
– Hold%a%reference%to%the%FormFactory$
• Type$(service/data)%
– Each%form%element%is%a%Type,%even%the%main%Form%
• Create%a%FormBuilder%instance%
– Alter%different%objects%during%the%form%lifecycle%
• FormBuilder%
• FormView%
• Form%(data):%%
– Hold%types%definiHons%
– Hold%the%form%subject%
– Responsible%for%binding%new%data%to%the%object%
• FormView%(data):%%
– contains%informaHon%about%how%to%render%the%form%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

11. Let’s%play!%
CarType%and%EngineType%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

12. CarType%
• Fields$
– CreatedAt%:%dateHme%
– Name%:%text%
– Engine%:%sonata_demo_form_type_engine%
• Custom%type%to%render%an%Engine%class%
• Outline%
– data_class%
– FormBuilder%
%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

13. RescueEngine%Extension%
• RescueEngine%:%choice%
– Custom%data%transformer%to%select%the%correct%
engine%
– Inherit%transformer%from%the%choice%type%
• Home%work%:%implement%as%a%custom%type%
• Outline%
– DataTransformer%
– Exercice%:%create%a%dedicated%RescueEngineChoiceType
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

14. Type%Extensions%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

15. Twig%Template%
• Custom%twig%template%
– No%communicaHon%with%the%current%template%
– ImformaHons%are%defined%inside%a%FormView%
instance%(Nested%FormView)%
• Rendering%workflow%
– Helpers%:%form_row,%form_rest,%form_errors%...%
– Block’s%name%:%array%of%concatenated%informaHon%
of%form%name%and%type%name%with%inheritance%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%

16. Custom%Block%
• Found%out%a%valid%name%….%
• Name%:%
– _sonata_demo_form_type_car_rescueEngine_label%
– choice_label%
– field_label%
Form%Component%–%Thomas%Rabaix%–%sfPot%13/03/2012%