Draper is an object-oriented layer that sits between view templates and models in Rails applications. It uses decorator objects to clean up complex view logic, provide a more object-oriented way to bundle view code, and make view code easier to test and maintain. The decorator pattern allows adding behavior to individual objects without affecting other objects, and Draper generators can be used to easily create decorators for models.

1. Draper
Decorators/View-Models for Rails Applications
Visnupriya. J .R
7th April 2014
@visnupriya90| github.com/visnupriya
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2. What is Draper?
• object-oriented layer of presentation
logic to your Rails application.
• The idea of Draper is to provide real ruby
class between the template and the
model.
• To decorate templates.
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3. Why use Draper?
• Clean up complex view logic
• Provides decorators which
bundles view logic in an object
oriented fashion
• Easy to test than helpers
• Code readability and easy to
maintain
• Code reuse
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4. What is Decorator Pattern?
• It is a design pattern.
• It allows behavior to be added to an
individual object, either statically or
dynamically, without affecting the behavior of
other objects from the same class
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5. Let’s see how to use?
• Add Draper to your Gemfile
• Generate decorator for a model as shown
below
• rails generate decorator Article
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6. SAMPLE CODE
Time to wakeup
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7. Questions?
Thank you
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