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RoR guide_p1
This document provides an overview of prerequisites for developing a Ruby on Rails application. It discusses key concepts like MVC, REST, and installation steps. It then demonstrates creating a sample "greeting" application by generating a controller, updating routes, and adding an index action that renders text. The document emphasizes following MVC patterns by updating the controller to assign a variable for the view, and updating the view to display it. It also explains that ERB files allow embedding Ruby code for logic and display.
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RoR guide_p1
- 1. Ruby on RailsGuide – P1 Brady Cheng http://bradyisstudying.blogspot.tw/
- 2.
- 3. Prerequisite What is Ruby? A programming language What is Rails? A web application framework programmed by Ruby
- 4. Prerequisite MVC Model-View-Controller Refer to this slide for other details http://www.slideshare.net/jaceju/mvc-8761203 Img src: http://www.ils.unc.edu/~uskala/MVC.htm
- 5. Prerequisite REST CRUD REST Note Create Post New data Read Get Read data Update Put Update data Delete Delete Delete data
- 6. Prerequisite Installation Windowsbase http://railsinstaller.org/ Trouble shooting ERROR: Error installing json: The 'json' native gem requires installed build tools. http://stackoverflow.com/questions/8100891/the-json- native-gem-requires-installed-build-tools
- 7. Prerequisite Create a newproject rails new your_project_name Start the created project cd project_name bundle install rails server Check http://localhost:3000 or http://127.0.0.1:3000
- 8. Prerequisite Project organization /app Organize your models, views, and controllers /config Configs such as database config (database.yml), rails environmental config (environment.rb)…etc /db Manage your database
- 9. Prerequisite Project organization /doc Docs generated by RubyDoc framework /lib Libs for your applications /log Error log such as “server.log”, “development.log”…etc /public Some html files for your applications
- 10. Prerequisite Project organization /script Some scripts for your applications /test Some tests written by you or by rails such as unit test, fixture tests…etc. /tmp Temp files /vendor Third party libs
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- 12. First App We canuse the following command to new a controller and related files rails generate GENERATOR ARG Generator can be assets, controller, helper…etc ARG here is the file name
- 13. First App Snapshot ofthe responses
- 14. First App Testing your http://127.0.0.1:3000/greeting Edit your config/routes.rb resources :greeting http://stackoverflow.com/questions/11696695/routing-error-ruby-on-rails
- 15. First App After updatingthe routes.rb Add an index function in your controller def index render :text=>”Hello Ruby world!” end
- 16. First App Aforementioned approachis somehow dirty We need to follow the MVC rules Update the index function in controller def index @welcome_msg = "Hello RoR world“ end Update view/index.html/erb <%= @welcome_msg %>
- 17. First App Worth tomention what erb file is ERB file = html code + ruby code Ruby code will be surrounded by <%...%> or <%=…%> <% code here %> : pure logic, nothing display to screen <%= code here %> : display something to screen
- 18. First App Worth tomention the Request scope Request scope Each http request will get a copy of the controller Pros : thread safe Cons: hard to share data between different requests Solution: use sessions