Senthil Kumar Bhaskaran

[senthiljruby]

Page Extractor Testing

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[senthiljruby]

Installing mysql2 in Windows 7

Download and Install mysql connector from mysql.com

copy libmysql.dll to ruby\bin

gem install mysql2 -- '--with-mysql-lib="C:\Program Files\MySQL\MySQL  Server 5.5\lib" --with-mysql-include="C:\Program Files\MySQL\MySQL Server 5.5\include"

  C:\Users\Senthil Kumar\Desktop>gem install mysql2 -- '--with-mysql-lib="C:\Program Files\MySQL\MySQL  Server 5.5\lib" --with-mysql-include="C:\Program Files\MySQL\MySQL Server 5.5\include" Temporarily enhancing PATH to include DevKit... Building native extensions with: '--with-mysql-lib="C:\Program Files\MySQL\MySQL Server 5.5\lib" --w ith-mysql-include="C:\Program Files\MySQL\MySQL Server 5.5\include"' This could take a while... Successfully installed mysql2-0.3.13 Parsing documentation for mysql2-0.3.13 unable to convert "\x90" from ASCII-8BIT to UTF-8 for lib/mysql2/mysql2.so, skipping Installing ri documentation for mysql2-0.3.13 1 gem installed

[senthiljruby]

Heroku on Rails

    gem install heroku

    heroku keys:add            email: [email protected]            password: *****

    git clone [email protected]

    git diff

    git status

    git add db/migrate

    git commit -am "Fixes ...."

    git push

    heroku rake db:migrate

[senthiljruby]

Difference between _url and _path in rails

_url

          It specifies the full path of the browser path along with the host name.

example

   users_url

  http://localhost:3000/users

  _path

          It only specifies the protocol path alone.

example

   users_path

   /users

  note:

          if u want to change the host path, use :host =>""

                         users_url(:host => "http://localhost:3001")

[senthiljruby]

Getting column name from the table in rails

  >> User

=> User(id:integer, name:string, password:string)

  To get the array of column names

>> User.column_names

=> ["id", "name", "password"]

To print the individual column names

>> User.column_names.each do |column|

>>    puts column

>> end

=> id

=> name

=> password

=> nil

=> ["id", "name", "password"]

[senthiljruby]

HAML in rails

HAML (HTML Abstraction Markup Language)

  To run haml into rails follow the below steps

gem install haml

rails senthil -d mysql

cd senthil

ruby script/generate controller Hello index

rake db:create

  Configuring the haml.

go to the \config\environment.rb and add the following line

       config.gem "haml"

Rename index.html.erb to index.html.haml

Replace the coding with following code.

        %h1 Hello#index         %p HELLO EVERYONE

Now run the server.

        ruby script/server

go to the browser and open up http://localhost:3000/home, u can see the encrypted haml coding there.

For Reference

       Element tag (p, span, strong ... except div tag) use % before the element name.

       For Class Element use . before the class element.

       For ID Element use # before the id element.

       No need to specify div tag, u can simply use class element or id element.

Multiple compination

%span {:class => "class_name", :id => "id_name"} Hello, Sagework!

%span.class_name#id_name Hello, Sagework!

Dynamic Tags

  <%= %> use just = alone.

  <% %> use just - alone.

[senthiljruby]

Searching available gems locally and in remote

Local

gem list --local rails

        (or)

gem list -l rails

Remote

gem list --remote rails

       (or)

gem list -r rails

[senthiljruby]

Running Test Case for particular files in Rails 3

>> rails sample -d mysql

>> cd sample

>> rails g scaffold User name:string email:string

>> rake db:create:all

>> rake db:migrate

  To run the particular test case i.e. user_test.rb use the following steps.

>> ruby -Itest test\unit\user_test.rb

Loaded suite test/unit/user_test Started . Finished in 3.868800 seconds.

1 tests, 1 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 57429

[senthiljruby]

Alternate for assert_valid in Rails 3

Alternate for assert_valid in Rails 3

  Rails 2.x.x

test "should not valid without name"

user = User.name :name => nil, :password => "senthil"

user.save

assert_valid(user)

end

  Rails 3.x.x

test "should not valid without name"

user = User.name :name => nil, :password => "senthil"

user.save

assert(user.valid?) // for checking valid user

end

[senthiljruby]

Alternate for < b> and < i> tag in HTML

Avoid using normal <b> and <i> tag in html page for better enhancement and some browser compatibility problem.

  instead of <b> use <strong> tag and for <i> use <em> tag

  <b> </b> => <strong> </strong>

<i> </i> => <em> </em>

[senthiljruby]

Preventing Form Resubmission in Rails xx

Preventing Form Resubmission in Rails xx

  application_controller.rb

def form_resubmission

    ActiveSupport::SecureRandom.base64(32) # u can also use MD5 digest for this part.

end

  View part which involves form submission

<% form_tag :action => "sample" do %>

    <%= hidden_field_tag "my_form_csrf", form_resubmission %>

    <%= text_field :form_1, :attr_1 %>

    <%= text_field :form_2, :attr_2 %>

    <%= submit_tag "Save" %>

<% end %>

  sample_controller.rb

def sample

    is_new_post = true

    if (session[:csrf_token] == params[:my_form_csrf])

          is_new_post = false

    end

   if (is_new_post)

       # user coding .....

   else

       flash[:notice] = "Form already submitted"

       redirect_to :back

   end

end

[senthiljruby]

Swaping two numbers in coffee script

Coffee Script Code

first_number = prompt("Enter first number to swap", "") second_number = prompt("Enter Second number to swap", "")

swap = (first_number, second_number) ->

temp = first_number first_number = second_number second_number = temp console.log (first_number) console.log (second_number)

swap first_number, second_number

  Javascript complied code

var first_number, second_number, swap;

first_number = prompt("Enter first number to swap", "");

second_number = prompt("Enter Second number to swap", "");

swap = function(first_number, second_number) {

                 var temp;

                 temp = first_number;

                 first_number = second_number;

                 second_number = temp;

                 console.log(first_number);

                 return console.log(second_number);

};

swap(first_number, second_number);

[senthiljruby]

Creating live application on Heroku with Rails 3.1.3

Create a new Rails application

rails new my_app -d mysql

Code the application with your own content,

                      ..............................

.............................

Add following code in GemFile

gem 'execjs'

group :production do   gem 'therubyracer', '~> 0.9.3.beta1'   gem 'pg' end

Now run bundler without production

bundle install --without production

After this create heroku application along with stack using,

heroku create my_app --stack cedar

Now commit the code to heroku,

  git push heroku master

  Counting objects: 67, done.

Delta compression using up to 4 threads.  

Compressing objects: 100% (52/52), done.

Writing objects: 100% (67/67), 86.33 KiB, done.

Total 67 (delta 5), reused 0 (delta 0) '

-----> Heroku receiving push

-----> Rails app detected ------------------------------------------- ------------------------------------------- -------------------------------------------

[senthiljruby]

Grape Gem

         Create a rails application,

               >> rails new basic_sample –d mysql

         Change a directory to the basic sample

               >> cd basic_sample

         Add the grape gem into file, Gemfile                                    gem "grape"

         Install the following gem using bundle install

>> bundle install

         Create a scaffold application for api creation,

>> rails g scaffold Article name:string description:string

         Create an application database,

>> rake db:create

         Migrating the application database into mysql

>> rake db:migrate

          Create a api lib file into lib/api.rb

#lib/api.rb

module BasicSample

  class API < Grape::API

    prefix 'api'

    resource 'entries' do

      get do

        Article.all

      end

       get ':id' do

        Article.find(params[:id])

      end

    end

  end

end

         Add the following line into config/routes.rb

mount BasicSample::API => "/"

         Add the following line at the top of config/routes.rb

require 'api'

         For Checking the Configuration routing,

>> rake middleware

         At last run server using,

>> rails s

         Open up the browser and type the url for fetching api.

>> http://localhost:3000/api/articles

         Finally We got the REST API Client.

[senthiljruby]

Fixing Invalid gemspec. #

For fixing this type of error follow the following steps:

Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/activemodel-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb664a594> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/tilt-1.3.3.gemspec]: invalid date format in specification: "2011-08-25 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/actionpack-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb668700c> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/json-1.6.1.gemspec]: invalid date format in specification: "2011-09-18 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/dm-serializer-1.2.1.gemspec]: invalid date format in specification: "2011-10-24 00:00:00.000000000Z" Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/railties-3.2.0.rc1.gemspec]: Illformed requirement ["#<YAML::Syck::DefaultKey:0xb66cc79c> 3.2.0.rc1"] Invalid gemspec in [/usr/lib/ruby/gems/1.8/specifications/json_pure-1.6.1.gemspec]: invalid date format in specification: "2011-09-18 00:00:00.000000000Z" 1.8.13

  1) gem update --system

2) gem uninstall rails -v 3.2.0.rc1

3) remove the gemspec file which is located on [/usr/lib/ruby/gems/1.8/specifications/..]

[senthiljruby]

Creating "Open with Scite" or "Open with Notepad" in context menu windows 7

OPEN WITH SCITE

Open regedit

HKEY_CLASSES_ROOT\*\shell

Create a new key named "Open with Scite"

Create a new key inside "Open with Scite" as "command"

Change the value of the key to "C:\bin\SciTE\SciTE.exe" "%1"

  OPEN WITH NOTEPAD

Open regedit

HKEY_CLASSES_ROOT\*\shell

Create a new key named "Open with Scite"

Create a new key inside "Open with Scite" as "command"

Change the value of the key to "notepad.exe" "%1"

[senthiljruby]

Rails 3.2.8 Installation Procedure

Installing Rails 3 for windows

  ·         Download DEVKIT

·         Extract the devkit into C:/

·         Add the bin directory to the environment variable path

·         Go to the C:/Devkit

·         ruby dk.rb  init

·         ruby dk.rb review

·         ruby dk.rb install

·         gem install rails –include-dependencies