What is "Entity" in DDD?

Transcript

1. What is “Entity” in DDD? k-kuwahara @kuwahara_jsri @clown0082 Mar 10, 2020 Active Book Dialogue @Yumemi
2. const my_info = { Workplace: ‘Yumemi Inc’, Position1: ‘Servant Leader of FET’, Position2: ‘CEO(secondary)’, Community: ‘Riot.js, Ionic, DIST’, PokemonGO: ‘TL40’ } About me
3. npm/~kkeeth
4. github.com/riot
5. definition of “Entity”
6. embody Domain Model Domain Object definitin of “Entity”
7. embody Domain Model definitin of “Entity” Domain Object But, there are 2 objects. So, “Value Object”, “Entity”
8. What is the difference between “Value Object” and “Entity”?
9. the difference Value Object Entity diff attributes/variables identity property immutability valiability change exchange/substitution behavior
10. Value Object
11. Value Object Name: John Age: 32 Gender: Male Name: Emily Age: 27 Gender: Female
12. Value Object Name: John Age: 32 Gender: Male Name: John Age: 32 Gender: Male
13. Entity
14. Entity Name: John Age: 32 Gender: Male Name: Emily Age: 27 Gender: Female
15. Entity Name: John Age: 32 Gender: Male Name: John Age: 32 Gender: Male
16. How do “Entity” identify each other?
17. Entity ID: 12345 Name: John Age: 32 Gender: Male ID: 98765 Name: John Age: 32 Gender: Male
18. Entity ID: 12345 Name: John Age: 32 Gender: Male ID: 98765 Name: John Age: 32 Gender: Male identity identity ID: 12345 ID: 98765
19. Merits of “Entity”
20. merits of “Entity” Code is more documentable Make changes in our domain easier to communicate to your code
21. merits of “Entity”
22. embody merits of “Entity”
23. Let’s join DDD!!