Getting Started with Rails Cheatsheet

8/7/2019 Getting Started with Rails Cheatsheet

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Getting Started with Rails

Note: Working code for the Events App available here https://github.com/gnaroji/Events-

Application

Color codes used in this cheat sheet

command line

code

Create the app

rails events

cd events

Add Events

Scaffold for events

script/generate scaffold event title:string description:string start_date:date end_date:date

user_id:integer

Run the migrationrake db:migrate

Add Pagination to the Events

Install the plugin

script/plugin installgit://github.com/mislav/will_paginate.git

Modify Events Controller Code

(app/controllers/events_controller.rb indexmethod)

--------------------------------CODE-----------------------------

@events = Event.paginate(:per_page => 5, :page => params[:page], :order => 'updated_at

DESC', :conditions => ['start_date >= ?', Date.today])

--------------------------------CODE-----------------------------

Add Pagination controls to the Events Index page

(# app/views/events/index.html.erb)

--------------------------------CODE-----------------------------

--------------------------------CODE-----------------------------

Add Users

Scaffold for Users

script/generate scaffold user first_name:string last_name:string login:string email:string

persistence_token:string crypted_password:string password_salt:stringAssociate an event with a user

(# app/models/event.rb)

--------------------------------CODE-----------------------------

belongs_to :user

--------------------------------CODE-----------------------------

Add a user_id field to the events model

script/generate migration AddUsersToEvents user_id:integer

User Creation Form
http://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtwhttp://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgnaroji%2FEvents-Application&sa=D&sntz=1&usg=AFQjCNEweHzL34TKLbyhnBwKsySbnwvMtw


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(# app/views/users/new.html.erb)

--------------------------------CODE-----------------------------

New user

--------------------------------CODE-----------------------------

Add User Authentication using Authlogic

Install Authlogic

script/plugin install git://github.com/binarylogic/authlogic.git

Add authentication to Users

(app/models/user.rb)

--------------------------------CODE-----------------------------

acts_as_authentic do |c|

c.require_password_confirmation = false

end

--------------------------------CODE-----------------------------

Create the model for User Session

script/generate session user_session

Create the controller for User Session

script/generate controller user_sessions new create destroy

Code forapp/controllers/user_sessions_controller.rb

--------------------------------CODE-----------------------------


3/5

before_filter :require_no_user, :only => [:new, :create]

before_filter :require_user, :only => :destroy

def new

@user_session = UserSession.new

end

def create@user_session = UserSession.new(params[:user_session])

if @user_session.save

flash[:notice] = "You have logged in successfully!"

redirect_to root_url

else

render :action => :new

end

end

def destroy

current_user_session.destroy

flash[:notice] = "You have logged out successfully!"


end

--------------------------------CODE-----------------------------

View for login

(app/views/user_sessions/new.html.erb)

--------------------------------CODE-----------------------------

Sign In

user_session_path do |f| %>

--------------------------------CODE-----------------------------

Wire up the URLs

(config/routes.rb)

--------------------------------CODE-----------------------------

map.resource :user_session

map.root :controller => "events", :action => "index"


4/5

--------------------------------CODE-----------------------------

Application Controller code

--------------------------------CODE-----------------------------

helper_method :current_user_session, :current_user

filter_parameter_logging :password

privatedef current_user_session

return @current_user_session if defined?(@current_user_session)

@current_user_session = UserSession.find

end

def current_user

return @current_user if defined?(@current_user)

@current_user = current_user_session && current_user_session.record

end

def require_user

unless current_user

flash[:notice] = "Please sign in to access this page"


return false

end

end

def require_no_user

if current_user

flash[:notice] = "Please sign out to access this page"redirect_to root_url

return false

end

end

--------------------------------CODE-----------------------------

Only logged in users should be able to create events

(app/controllers/events_controller.rb add at the start of the newmethod)

-------------------------------CODE-----------------------------

if current_user.nil?

flash[:notice] = "You must be logged in to access this page"

redirect_to (new_user_session_url)

return

end

--------------------------------CODE-----------------------------

In case you have to use the Gem

# config/environment.rb

config.gem 'will_paginate', :version => '~> 2.3.11', :source => 'http://gemcutter.org'


5/5

config.gem "authlogic"

Documents

Getting Started with Rails Cheatsheet