3-minute fever 三分鐘熱度

By default, there is no validation on the input on the form that we have created. The validation code shall be put in the model file. Oh, I just realize that I did not mention about MVC. MVC stand for Model-View-Controller. It is a kind of software pattern that separate the application into 3 components. The model is the application object, the controller defines the application interface, while the view defines the presentation. For more information, can go wiki to check it out. :) The model file resides in <root directory>/app/models. For my example, the file is blog/app/models/test_j.rb. The TestJ class is a sub class of ActiveRecord::Base . The attr_accessible is to specify what are the attributes can be updated. I tried to remove the tag from the attr_accessible and try to create a new record, this is the error observed. This is only experimental testing. I am not sure how this is to be done to have the error message displayed nicely instead of giving inter...

Creating a resource. The format used is as follow : $ rails generate scaffold <resource name> <list of fields> Example : $ rails generate scaffold test_j author:string title:string tag:string content:text create_datetime:timestamp Create associated table in the database. $ rake db:migrate Then you are done! This new resource can be accessed by http://0.0.0.0:3000/<resource name>/ For the example that I used, it would be http://http://0.0.0.0:3000/test_js/ Click on the New Test_j link will give you the form that we created with the one line command earlier. Note that, the date time is showing current GMT time. I haven't figured out why/how matters. :)

Tutorial that I am following is from this site : http://guides.rubyonrails.org/getting_started.html I choose to sudo as root to avoid the permission issue. $ sudo su Install Ruby $ apt-get install rubygems Install Rails $ gem install rails Create a blog application $ rails new blog Note : You might encounter this error. Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension To solve this, install sqlite before create the blog application. $ apt-get install libsqlite3-dev $ gem install sqlite3 -v '1.3.6' Create a database $ rake db:create You might encounter this error. rake aborted! Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes. Go to the created blog directory. Edit this file : Gemfile. Uncomment this line : gem 'therubyracer', :platform => :ruby Run this (installing nodejs and also reinstall rails) : $ apt-get install nodejs $ bundle install To start t...