Using Database Constraints Wisely

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barunio

Presented at the December 13 Boston.rb meeting

Technology

Using database
constraints wisely
Barun Singh
bsingh@wegowise.com

Founder & CTO

What is a database?
A collection of data that you can
read, write, and organize

The software tools that let you do this

What do we want from a
database?
It should be …

•  Reliable
•  Fast
•  Secure
•  …

A relational database
is not the same as
a generic data store

What do we want from a
relational database?
It should be …

•  Reliable
•  Fast
•  Secure
•  Sensible
•  …

Wait a minute…
Is this Rails approved™ ?

The Rails way says…
•  You should be database agnostic
•  Application layer is the only really important
part

What’s the worst that can
happen?
•  Feature doesn’t work
•  Site goes down
•  Irrecoverable data loss

I write tests. Why bother
with database constraints?
I test my entire application flow through
integration tests.

Why write unit tests?

I write tests. Why bother
with database constraints?
My application requires Javascript, and I have
JS validations.

Why bother with model-level validations?

How?
•  Simple constraints: [not null]
•  Unique indices
•  Foreign keys [foreigner gem]

Polymorphism

Imageable
Employee
Picture
Product

A couple little snags…
How can you make sure that one picture
has only an employee_id or product_id
but not both?
(xor constraints are tough)

And what if the polymorphic relationship has
to be unique?

Polymorpheus
The gem takes care of all of this for you
through a simple migration method

Polymorpheus
Also provides a validation method,
model level validations are still important

You can keep your
application logic clean
and
set up your database
properly

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Using Database Constraints Wisely

1. Using database constraints wisely Barun Singh bsingh@wegowise.com Founder & CTO

2. What is a database? A collection of data that you can read, write, and organize The software tools that let you do this

3. What do we want from a database? It should be … •  Reliable •  Fast •  Secure •  …

4. A relational database is not the same as a generic data store

5. A relational database is not the same as a generic data store

6. What do we want from a relational database? It should be … •  Reliable •  Fast •  Secure •  Sensible •  …

7. Wait a minute… Is this Rails approved™ ?

8. The Rails way says… •  You should be database agnostic •  Application layer is the only really important part

9. The database is important

10. But why? Because you make mistakes.

11. What’s the worst that can happen? •  Feature doesn’t work •  Site goes down •  Irrecoverable data loss

12. I write tests. Why bother with database constraints? I test my entire application flow through integration tests. Why write unit tests?

13. I write tests. Why bother with database constraints? My application requires Javascript, and I have JS validations. Why bother with model-level validations?

14. Your database has an interface.

15. How? •  Simple constraints: [not null] •  Unique indices •  Foreign keys [foreigner gem]

16. It’s not always that simple

17. Polymorphism Imageable Employee Picture Product

18. Polymorphism What does this reference?

19. Polymorphism

20. Polymorpheus

21. A couple little snags… How can you make sure that one picture has only an employee_id or product_id but not both? (xor constraints are tough) And what if the polymorphic relationship has to be unique?

22. Polymorpheus The gem takes care of all of this for you through a simple migration method

23. Polymorpheus The gem takes care of all of this for you through a simple migration method

24. Polymorpheus

25. Polymorpheus Also provides a validation method, model level validations are still important

26. You can keep your application logic clean and set up your database properly

27. Questions? bsingh@wegowise.com

Using Database Constraints Wisely

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