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Listing 3-6. The app/controllers/events_controller.rb File
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class EventsController < ApplicationController def index list render :action => 'list' end # GETs should be safe (see http://www.w3.org/2001/tag/doc/whenToUseGet.html) verify :method => :post, :only => [ :destroy, :create, :update ], :redirect_to => { :action => :list } def list @event_pages, @events = paginate :events, :per_page => 10 end def show @event = Event.find(params[:id]) end def new @event = Event.new end def create @event = Event.new(params[:event]) if @event.save flash[:notice] = 'Event was successfully created.' redirect_to :action => 'list' else render :action => 'new' end end
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CHAPTER 3 GETTING SOMETHING RUNNING
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def edit @event = Event.find(params[:id]) end def update @event = Event.find(params[:id]) if @event.update_attributes(params[:event]) flash[:notice] = 'Event was successfully updated.' redirect_to :action => 'show', :id => @event else render :action => 'edit' end end def destroy Event.find(params[:id]).destroy redirect_to :action => 'list' end end
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If you refresh the application in your browser, you ll notice that nothing has changed. The generated scaffold is identical in every way to the dynamic type. The big difference, though, is that once you ve generated scaffolding, if you change your model, you ll have to regenerate it if you want your application to follow suit. Most of the time, however, you ll make the changes by hand. It s important that you realize why scaffolding exists and that you re aware of its limitations. As we ve just demonstrated, scaffolding helps when you need to get something running quickly to test your assumptions. It won t take you very far in the real world, and eventually you ll end up replacing most (if not all) of it. Explore the generated code and see if you can figure out how it hangs together. Don t worry if you can t understand all of it. We ll discuss it in depth in the chapters that follow. With everything you know about Rails already, you should be able to piece together most of it. Try changing a few things to see what happens. If you inadvertently break something, you can always run the scaffolding generator again to revert to the original. Can you see how the views in app/views/events are related to the actions What about the response messages, like Event was successfully created What happens when you change them See if you can find where the error messages for failed validations are rendered. If you remove the message, does the record still get saved You ll learn a lot by exploring, so take as much time as you need.
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We started this chapter by outlining the basics of our sample application. Then we rolled up our sleeves and created our database and configuration files. Based on the goals of our application, we began by creating the tables necessary to run the core of our Event model and got a first look at the simplicity and flexibility that migrations give our development processes. Then the scaffolding allowed us to test our assumptions about the model and table we created by getting a firsthand look at it in action. Also, we took a first crack at adding in validations that ensure that we maintain the integrity of our data. In the chapters that follow, we will investigate each of these concepts in depth.
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Working with a Database: Active Record
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n the previous chapter, we took a whirlwind tour through creating a basic Rails application using the built-in scaffolding feature. We sketched out a basic model for our sample application, an event manager, and created the project databases. We used the built-in web server to deploy the application locally, and practiced adding and managing events from the web browser. In this chapter, we re going to take a more in-depth look at how things work, starting with what is arguably the most important part of Rails: Active Record. You might recall from 1 that Active Record is the Ruby library that handles database abstraction and interaction for Rails. In fact, whether you realized it or not, in the previous chapter, all the access to the database adding, editing, and deleting events happened through the magic of Active Record. Active Record is the name given to the object-relational mapping library that ships with Rails. If you re not sure what exactly object-relational mapping is, don t worry. By the end of this chapter, you will know. For now, it s best if you think of Active Record as being an intermediary that sits between your code and your database, allowing you to work with data effectively and naturally. When you use Active Record, you communicate with your database using pure Ruby code. Active Record translates the Ruby you write into a language that databases can understand. The purpose of this chapter is to teach you how to use Active Record to talk to your database and perform basic operations. We ll introduce you to the concepts you need to know about communicating with databases and object-relational mapping. Then we ll take a look at Active Record and walk you through the techniques you need to know to effectively work with a database from Rails. If you don t have a lot of database experience under your belt, you needn t worry. You ll find that working with databases through Active Record is a painless and even enjoyable experience. If you re an experienced database guru, you ll find that Active Record is an intelligent and efficient way to perform database operations without the need for low-level database-specific commands.
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