Hobo is a Ruby on Rails web application framework that provides default user authentication, CRUD functionality, and a DRYML templating language. It allows for rapid development of web applications. The document discusses getting started with Hobo, creating models and controllers, customizing applications using DRYML tags, and hosting and maintaining Hobo applications in production.

1. Agile Web Development with Hobo Evarist Lobo [email_address]

2. Introduction Hobo is a rapid web application builder It uses Ruby on rails and several plugins Provides default user model and themes CRUD and AJAX support DRYML tagging language and libraries Easily customizable

3. Prerequisites Assumes basic knowledge of web development, databases, Ruby and Rails For Windows: install InstantRails For MacOS X: install Locomotive Test that you have Ruby and Rails up and running

4. Getting started Download hobo gem from hobocentral Install hobo gem

5. Create Application Skeleton hobo <appname> Runs Rails Runs Hobo App generator Default theme Basic user model

6. Create MySQL Database Use phpmyadmin <appname>_development

7. Create Model and Controller cd <appname>/script/generate hobo_model <model_name> creates basic files, unit tests and schema cd <appname>/script/generate hobo_model_controller <model_name> creates controller and helper classes

8. Add Fields Add fields to your tables in the migrations scripts auto dates foreign keys are Hobo options rake db:migrate

9. Create Object Relationships Advert belongs_to :user belongs_to :category set_creator_attr :user

10. Start the application Use Instant Rails Console to start application Login signup search Uses acts_as_authenticated plugin Scriptaculous AJAX editor

11. Customizing Application Using DRYML changing the index page each DRYML tag calls a Rails helper method changing generated page creating tags

12. Hobo Rapid tags <index_page> <show_page> <new_page> <edit_page> <show_collection_page> <new_in_collection_page>

13. Core and Common tags repeat panel show section maincol sidecol display_name object_link new_object_link count with join if else

14. Page navigation <page_nav> <first_page_link> <last_page_link> <next_page_link> <previous_page_link> <page_n_of_count>

15. CRUD buttons <create_button> <delete_button>

16. Create your own tag ! def : Definition <def tag=&quot;my_tag&quot;>This is my tag</def> Use <my_tag/> Output This is my tag

17. Creating tags Tags with attributes The attributes become local variables inside the tag. Passing arbitrary values Implicit context

18. Creating tag libraries Use <taglib> to load tags from another Dryml file Note that app/views/hobolib/application.dryml is implicitly imported into every Dryml template. You can load the tags from a directory or a Ruby module

19. Using Tags from Ruby Tags are just methods, they can be called from ERB scriptlets and from helpers. Call with parameters or content

20. Modifying theme and stylesheet Look at screencast for example Many designs available at opendesigns.org

21. Hosting your Applications Capistrano is a tool to deploy ruby applications Lots of plugins and tutorials exist to make your applications scale with memcache You can host your application with Amazon S3 and EC2

22. Resources http://www.hobocentral.net Download plugin Look at screencasts for quickstart Read the blogs Read the forums

23. Contributing look at code in Trac Log bugs Send patches/bug fixes to Tom Locke Create documentation Create sample applications and tutorials

24. Thank You Thanks to Tom Locke and others for creating Hobo. Please email me your feedback at evarist@gmail.com