Ruby installation and create application

Ruby on Rails

Installation:

• Rails-3.2.11
• Ruby 1.9.2

 Ruby Installation:

•   curl -L https://get.rvm.io | bash -s stable
• --bash -sk stable < <(curl -sk                  https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
• [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
• rvm install 1.9.2(if you need 1.9.3  you change 1.9.3)

Rail instalation:

                            gem install rails r=3.2.11

Create New Project:

           step 1 -->[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"

           step 2 -->rvm --create use1.9.2@name(gemset give any name)

           step 3--> rails new blog(projectname)

   step 4--> rm -rf Gemfile.lock

          step 5->change gem 'mysql2' in GemFile

           step 6-->bundle install(used for maintain rail version)

-->Exception

An error occurred while installing mysql2 (0.3.11), and Bundler cannot continue.

Make sure that `gem install mysql2 -v '0.3.11'` succeeds before bundling.

-->Solution

       sudo apt-get install libmysqlclient-dev

          step 7--> rake db:create

Exception:

                      Could not find a JavaScript runtime. See https://github.com/sstephenson/execjs for a list of available runtimes.

solution

-->gem install execjs

        step 8--> rails g scaffold Question(give your application name any name) title:string             

                      questions:string answers:string(field name)

                                                                       rails      mysql or other

:binary     blob

         :boolean    tinyint(1)

:date     date

:datetime   datetime

:decimal    decimal

:float   float

:integer    int(11)

:string     varchar(255)

:text     text

:time     time

:timestamp  datetime

step 9-->-->rake db:migrate

step10-->rails server

       step 11:open browser type url localhost:3000/ blog (projectname)

   if  you add model or controller to your application follow below instruction 

      model

                 rails g model User(modelname)

      controller

                 rails g controller User (controller name)

      mailer
                rails g mailer  user_mail(mailer name)

      migration 
             scaffold
               rails g scaffold Question(give your application name any name) title:string          

                      questions:string answers:string(field name)

       add new-column

                    rails g migration add_fieldname_to_tablename  fieldname:string