ProgramGood.Net

here is how we do it from scaffolding:

Symbols and Strings

<%= f.label :seat_id_seq %>   This is a symbol.  They always start with a colon.  Generally used to name things.  Mostly interchangeable with strings.

<%= f.label “Seat #” %>   This is a string.

Add a column to the DB

to add the database we:

ruby script/generate scaffold ticket name:string seat_id_seq:string address:text price_paid:decimal email_address:string

to add a row:

ruby script/generate migration AddPhoneToTickets phone:string

important bit is Add…To…

then

rake db:migrate

then changed the 4 view to display the new field.

Starting From Scratch

The scaffolding can create too much code!  Here is an app just generating 1 page to start with (a show page)

ruby script/generate model ad name:string description:text price:decimal seller_id:integer email:string img_url:string

models have singular names eg ticket, ad

Controller

ruby script/generate controller ads

controllers have plural names

Routes

map.connect '/ads/:id', :controller=>'ads', :action=>'show'

use the ads_controller.rb, and the show template.

View

show.html.erb

<p>
    <b>Name:</b><%= @ad.name %>
</p>

Index Page

controller:

  def index
    @ads = Ad.find(:all)
  end

index.html.erb

<% for ad in @ads%>
    <li><a href="/ads/<%= ad.id%>"><%=ad.name%></a></li>
<% end %>

route

map.connect 'ads/', :controller=>'ads', :action=>'index'

Layouts

images into public/images

stylesheet into public/stylesheets

apps/views/layouts/ads.html.erb

Post New Ads Online

routes

map.connect 'ads/new', :controller=>'ads', :action=>'new'
map.connect 'ads/create', :controller=>'ads', :action=>'create'

viewff

 

ads/new.html.erb

and the form will be submitted to:

ads/create

 

RoR Text Editor

Am trying http://www.e-texteditor.com/

ctrl shift p – toggle between project view and editor view

http://www.e-texteditor.com/wiki/index.php/Projects#Keyboard_navigation – keyboard shortcuts

Create Form Helper

Rails can create forms that are associated with model objects. so in new.html.erb

<% form_for(@ad,:url=>{:action=>'create'}) do |f| %>
  <p><b>Name</b><br /><%= f.text_field :name %></p>
  <p><b>Description</b><br /><%= f.text_area :description %></p>
  <p><b>Price</b><br /><%= f.text_field :price %></p>
  <p><b>Seller</b><br /><%= f.text_field :seller_id %></p>
  <p><b>Email</b><br /><%= f.text_field :email %></p>
  <p><b>Img url</b><br /><%= f.text_field :img_url %></p>
  <p><%= f.submit "Create" %></p>
<% end %>

eg this comes out as:

<b>Name</b><br /><input id="ad_name" name="ad[name]" size="30" type="text" />

so when the submit button is pressed, this routes back to the create action in the AdsController.

Controller

def new
      @ad = Ad.new   
  end

  def create
      @ad = Ad.new(params[:ad])
      @ad.save
      redirect_to "/ads/#{@ad.id}"
  end

note:  create an empty ad object before passing onto new

and we have an automatic redirect to the listing

otherwise could have commented out and it would go automatically to create.html.erb:

Edit a Record

routes add in

map.connect 'ads/:id/edit', :controller=>'ads', :action=>'edit'
map.connect 'ads/:id/update', :controller=>'ads', :action=>'update'

controller add in

def edit
      @ad = Ad.find(params[:id])
  end
  def update
      @ad = Ad.find(params[:id])
      @ad.update_attributes(params[:ad])
      redirect_to"/ads/#{@ad.id}"
  end

view add in

<% form_for(@ad,:url=>{:action=>'update'}) do |f| %>
  <p><b>Name</b><br /><%= f.text_field :name %></p>
  <p><b>Description</b><br /><%= f.text_area :description %></p>
  <p><b>Price</b><br /><%= f.text_field :price %></p>
  <p><b>Seller</b><br /><%= f.text_field :seller_id %></p>
  <p><b>Email</b><br /><%= f.text_field :email %></p>
  <p><b>Img url</b><br /><%= f.text_field :img_url %></p>
  <p><%= f.submit "Update" %></p>
<% end %>

Security

in the AdsController

before_filter :check_logged_in, :only => [:edit, :update]

  private
    def check_logged_in
        authenticate_or_request_with_http_basic("Ads") do |username, password|
            username == "admin" && password == "secret"
        end
    end

 

Delete

Just calling a single action on the controller called destory which then redirects back to index.

 

**TODO put this live