taming the view for rubyconf india
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Taming of the ViewRubyConf India 2010Sarah Taraporewalla
ThoughtWorks
Sunday, 21 March 2010
I will attempt to convince you that:
Sunday, 21 March 2010
I will attempt to convince you that:
- the current template engines are too permissive
Sunday, 21 March 2010
I will attempt to convince you that:
- the current template engines are too permissive
- there are loads of code bases that break fundamental principles
Sunday, 21 March 2010
I will attempt to convince you that:
- the current template engines are too permissive
- there are loads of code bases that break fundamental principles
- you should turn to other template engines
Sunday, 21 March 2010
What is wrong with these examples?
Sunday, 21 March 2010
Example 1
Sunday, 21 March 2010
Example 2
Sunday, 21 March 2010
Example 3
Sunday, 21 March 2010
Example 4
Sunday, 21 March 2010
AGH! This is really really easy in Rails3
now!
Sunday, 21 March 2010
Controller
Sunday, 21 March 2010
Why do we get thin controllers?
Sunday, 21 March 2010
Push vs Pull
http://www.flickr.com/photos/91772025@N00/444044158/ CC BY-ND 2.0
Sunday, 21 March 2010
Pull
View Controllers Model
Sunday, 21 March 2010
Pull - over time
ViewControllers Model
Sunday, 21 March 2010
Push
View Controllers Model
Sunday, 21 March 2010
Push - over time
View
Controllers
Model
Sunday, 21 March 2010
Push - and then
View Controllers Services
Sunday, 21 March 2010
What do we want?
Sunday, 21 March 2010
Testable Code
Sunday, 21 March 2010
Testable Code
Don’t put logic in your views
Sunday, 21 March 2010
Single Responsibility
Sunday, 21 March 2010
Single Responsibility
Don’t let changes in column names effect your views
Sunday, 21 March 2010
Separation of Concerns
Sunday, 21 March 2010
Separation of Concerns
Enforce strict separation of model and view
Sunday, 21 March 2010
How do we improve on the examples?
Sunday, 21 March 2010
Example 1 - Before
Sunday, 21 March 2010
Example 1 - Improved
Sunday, 21 March 2010
Example 2 - Before
Sunday, 21 March 2010
Example 2 - Improved
Sunday, 21 March 2010
Example 2 - Improved
Sunday, 21 March 2010
Example 3 - Before
Sunday, 21 March 2010
Example 4 - Before
Sunday, 21 March 2010
Example 3,4 - Improved
Sunday, 21 March 2010
Example 3,4 - Improved
Sunday, 21 March 2010
If you make it easy to do the wrong thing, the
wrong thing will be done
Sunday, 21 March 2010
If you make it easy to do the right thing, the
right thing will be done
Sunday, 21 March 2010
Haml
Sunday, 21 March 2010
Haml
Sunday, 21 March 2010
Haml
Good
Sunday, 21 March 2010
Haml
Good
But ...
Sunday, 21 March 2010
Haml
Good
But ...
still allows ruby
Sunday, 21 March 2010
String Template
Sunday, 21 March 2010
StringTemplate
- Strict separation of model & view
- Fits well with functional programming
- Written in Java, .Net, Python
is NOT Turing complete
Sunday, 21 March 2010
1. Create a StringTemplate Object with the template
Sunday, 21 March 2010
1. Create a StringTemplate Object with the template
string or file
Sunday, 21 March 2010
2. Set attributes and their values
Sunday, 21 March 2010
3. Call toString() to mash attributes onto the template
Sunday, 21 March 2010
Testable?
Sunday, 21 March 2010
Testable? Yes!
Sunday, 21 March 2010
Single Responsibility?
Sunday, 21 March 2010
Single Responsibility? Yes!
Sunday, 21 March 2010
Separation of Concerns?
Sunday, 21 March 2010
Separation of Concerns? Yes!
It is the essence of its philosophy
Sunday, 21 March 2010
Other cool things...
Sunday, 21 March 2010
Templates (Partials)
Sunday, 21 March 2010
Iterators
Sunday, 21 March 2010
Iterators
Sunday, 21 March 2010
Renderers
Sunday, 21 March 2010
Localisation
Sunday, 21 March 2010
But, we do Ruby
Sunday, 21 March 2010
Slippers
Sunday, 21 March 2010
Slippers
Sunday, 21 March 2010
Slippers & Ramaze
Sunday, 21 March 2010
Slippers - Example
Sunday, 21 March 2010
Slippers - Example
Sunday, 21 March 2010
Slippers - Example
Sunday, 21 March 2010
Slippers - Exampleindex.st
person/index.st
person/age.stSunday, 21 March 2010
Slippers - Exampleperson/age_renderer.rb
controller/role_renderer.rb
Sunday, 21 March 2010
Slippers - Example
Sunday, 21 March 2010
Slippers - Testable?
• Holes are correctly plugged
• Correct instance variables set
• Renderers
Sunday, 21 March 2010
• Holes are correctly plugged
• Correct instance variables set
• Renderers
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
• Holes are correctly plugged
• Correct instance variables set
• Renderers
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
• Holes are correctly plugged
• Correct instance variables set
• Renderers
Slippers - Testable?
Sunday, 21 March 2010
Slippers - Testable?
Sunday, 21 March 2010
Slippers
Sunday, 21 March 2010
Slippers
• Can be found at:
‣ http://slippersRb.com
‣ http://github.com/starapor/slippers
‣ http://gemcutter.org/gems/slippers
• Ramaze view template
‣ http://ramaze.net
Sunday, 21 March 2010
Have I convinced you that:
Sunday, 21 March 2010
Have I convinced you that:
- the current template engines are too permissive
Sunday, 21 March 2010
Have I convinced you that:
- the current template engines are too permissive
- there are loads of code bases that break fundamental principles
Sunday, 21 March 2010
Have I convinced you that:
- the current template engines are too permissive
- there are loads of code bases that break fundamental principles
- we should turn to other template engines
Sunday, 21 March 2010
questions?
Sunday, 21 March 2010
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