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  • Getting Started With Rails Cheatsheet

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    Sagar Arlekar
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    The cheat sheet for the Events App https://github.com/gnaroji/Events-Application Reference : Innofest 2011, Ruby on Rails Workshop

    Original Title

    Getting Started with Rails Cheatsheet

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    The cheat sheet for the Events App https://github.com/gnaroji/Events-Application Reference : Innofest 2011, Ruby on Rails Workshop

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Flag for inappropriate content
    579 views5 pages

    Getting Started With Rails Cheatsheet

    Uploaded by

    Sagar Arlekar
    The cheat sheet for the Events App https://github.com/gnaroji/Events-Application Reference : Innofest 2011, Ruby on Rails Workshop

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Flag for inappropriate content
    of 5

    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 migration
    rake db:migrate

    Add Pagination to the Events


    Install the plugin
    script/plugin install git://github.com/mislav/will_paginate.git
    Modify Events Controller Code
    (app/controllers/events_controller.rb – index method)
    --------------------------------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-----------------------------
    <%= will_paginate %>
    --------------------------------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:string
    Associate 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


    (# app/views/users/new.html.erb)
    --------------------------------CODE-----------------------------
    <h1>New user</h1>
    <% form_for(@user) do |f| %>
    <%= f.error_messages %>
    <p>
    <%= f.label :username %><br />
    <%= f.text_field :login %>
    </p>
    <p>
    <%= f.label :password %><br />
    <%=h f.password_field :password %>
    </p>
    <p>
    <%= f.label :first_name %><br />
    <%= f.text_field :first_name %>
    </p>
    <p>
    <%= f.label :last_name %><br />
    <%= f.text_field :last_name %>
    </p>

    <p>
    <%= f.submit 'Create User' %>
    </p>
    <% end %>

    <%= link_to 'Back', users_path %>


    --------------------------------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 for app/controllers/user_sessions_controller.rb


    --------------------------------CODE-----------------------------
    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!"
    redirect_to root_url
    end
    --------------------------------CODE-----------------------------

    View for login


    (app/views/user_sessions/new.html.erb)
    --------------------------------CODE-----------------------------
    <h1>Sign In</h1>

    <% form_for @user_session, :url => user_session_path do |f| %>


    <%= f.error_messages %>
    <%= f.label :username %><br />
    <%= f.text_field :login %><br />
    <br />
    <%= f.label :password %><br />
    <%= f.password_field :password %><br />
    <br />
    <%= f.check_box :remember_me %><%= f.label :remember_me %><br />
    <br />
    <%= f.submit "Sign In" %>
    <% end %>
    --------------------------------CODE-----------------------------

    Wire up the URLs


    (config/routes.rb)
    --------------------------------CODE-----------------------------
    map.resource :user_session
    map.root :controller => "events", :action => "index"
    --------------------------------CODE-----------------------------

    Application Controller code


    --------------------------------CODE-----------------------------
    helper_method :current_user_session, :current_user
    filter_parameter_logging :password

    private
    def 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"
    redirect_to root_url
    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 new method)
    -------------------------------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'
    config.gem "authlogic"

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