c# barcode generator wpf Revisiting the Scaffold Generator in Font

Encoder PDF 417 in Font Revisiting the Scaffold Generator

Revisiting the Scaffold Generator
Painting PDF-417 2d Barcode In None
Using Barcode drawer for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
EAN 13 Generation In None
Using Barcode maker for Font Control to generate, create EAN 13 image in Font applications.
www.OnBarcode.com
You generated a scaffold for your articles in 3, and this scaffold generated a RESTful controller for the Article model in addition to all the required templates. The generator also added the resources declaration to your route.rb file. Listing 6-4 shows the ArticlesController that your scaffold generated. Listing 6-4. app/controllers/articles_controller.rb class ArticlesController < ApplicationController # GET /articles
Barcode Generator In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Making UPCA In None
Using Barcode generation for Font Control to generate, create UPCA image in Font applications.
www.OnBarcode.com
ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
GS1 128 Encoder In None
Using Barcode encoder for Font Control to generate, create EAN128 image in Font applications.
www.OnBarcode.com
QR Encoder In None
Using Barcode printer for Font Control to generate, create QR Code ISO/IEC18004 image in Font applications.
www.OnBarcode.com
# GET /articles.xml def index @articles = Article.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @articles } end end # GET /articles/1 # GET /articles/1.xml def show @article = Article.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @article } end end # GET /articles/new # GET /articles/new.xml def new @article = Article.new respond_to do |format| format.html # new.html.erb format.xml { render :xml => @article } end end # GET /articles/1/edit def edit @article = Article.find(params[:id]) end # POST /articles # POST /articles.xml def create @article = Article.new(params[:article]) respond_to do |format| if @article.save format.html { redirect_to(@article, :notice => 'Article was successfully created.') } format.xml { render :xml => @article, :status => :created, :location => @article } else format.html { render :action => "new" } format.xml { render :xml => @article.errors, :status => :unprocessable_entity }
Print Barcode In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
ANSI/AIM Code 93 Maker In None
Using Barcode generator for Font Control to generate, create Code 93 Extended image in Font applications.
www.OnBarcode.com
ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
PDF417 Maker In None
Using Barcode creation for Online Control to generate, create PDF-417 2d barcode image in Online applications.
www.OnBarcode.com
PDF417 Generation In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create PDF-417 2d barcode image in Visual Studio .NET applications.
www.OnBarcode.com
end end end # PUT /articles/1 # PUT /articles/1.xml def update @article = Article.find(params[:id]) respond_to do |format| if @article.update_attributes(params[:article]) format.html { redirect_to(@article, :notice => 'Article was successfully updated.') } format.xml { head :ok } else format.html { render :action => "edit" } format.xml { render :xml => @article.errors, :status => :unprocessable_entity } end end end # DELETE /articles/1 # DELETE /articles/1.xml def destroy @article = Article.find(params[:id]) @article.destroy respond_to do |format| format.html { redirect_to(articles_url) } format.xml { head :ok } end end end This may look like a lot of code to swallow, but in reality it s simple. The scaffold generator creates the articles controller with the default seven actions discussed earlier for RESTful controllers: index, show, new, edit, create, update, and destroy. Before your action renders a view, you arrange for it to set an instance variable that the view can use. To refresh your memory, an instance variable is a special kind of Ruby variable that is unique to a given instance of a class, serving as a way for an object to maintain its state. Because views are, in essence, extensions of the controller object, they can access its instance variables directly (although not without some behind-the-scenes Ruby magic that Rails takes care of for you). For all intents and purposes, however, you can consider instance variables to be shared between controllers and views. You can store any Ruby object in an instance variable, including strings, integers, models, hashes, and arrays. If you reexamine each action in the articles controller, notice that it always starts by setting an instance variable to be called later in that action s view. Let s take the index method as an example (see Listing 6-5).
EAN 13 Encoder In VS .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create EAN13 image in .NET applications.
www.OnBarcode.com
DataMatrix Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
Generate UCC - 12 In Java
Using Barcode creation for Java Control to generate, create UPC Symbol image in Java applications.
www.OnBarcode.com
1D Creation In Visual C#.NET
Using Barcode drawer for .NET Control to generate, create Linear 1D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Listing 6-5. The Index Action in app/controllers/articles_controller.rb # GET /articles # GET /articles.xml def index @articles = Article.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @articles} end end You define and set an instance variable named @articles, which holds the array of all your articles. Then, you call the respond_to method, which tells the index action how to respond to every supported format in your application. Let s step back a bit. When you call the index method by typing the URL (http://localhost:3000/articles) into your browser don t forget to start your local server using the rails server command the request goes first to your routes file, where it s forwarded to the controller. Then, the controller responds to this request by setting an instance variable and rendering something back to the browser. What the controller renders is based on what has been requested. Normally, it s an HTML page request, but it can also be an XML or an Ajax request. It s the responsibility of the respond_to method to define how to respond to each of those requests. In the index action, you accept two formats: HTML, where Rails renders the index template using the path (/articles); and XML, where Rails renders the articles in XML format using the path (/articles.xml). Try that in the browser. Visit http://localhost:3000/articles to see the list of articles you know and saw earlier, and visit http://localhost:3000/articles.xml to see the result shown in Figure 6-2.
GTIN - 12 Recognizer In VS .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Drawing DataBar In Java
Using Barcode creation for Java Control to generate, create GS1 DataBar Limited image in Java applications.
www.OnBarcode.com
Draw Data Matrix ECC200 In VB.NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
www.OnBarcode.com
DataMatrix Scanner In VB.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Drawing GS1 - 13 In Objective-C
Using Barcode generator for iPhone Control to generate, create GS1 - 13 image in iPhone applications.
www.OnBarcode.com
Data Matrix 2d Barcode Generator In Visual C#
Using Barcode printer for .NET Control to generate, create ECC200 image in .NET framework applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.