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Specifies the conditions in which the records are returned as a WHERE SQL fragment Specifies the order in which the records are returned as an ORDER BY SQL fragment Specifies the number of records to be returned as a LIMIT SQL fragment Specifies associated tables to be joined in as a JOIN SQL fragment Specifies associated tables to be joined and loaded as Active Record objects in a JOIN SQL fragment

Now delete the list action. This cuts down on the clutter. Also, using the index action as the collection action (wherein we display a list of resources) is a Rails convention not yet applied to the scaffold generator. We can apply another of the techniques you ve learned rendering a collection of partials to further improve the code.

With scaffolding, you get a basic but complete data-driven web application with just a few lines at the command prompt. However, next you need to look at what the scaffolding generator actually generated, and learn how to customize the models, controllers, and views to create the specific application that you want. This experience will be particularly valuable if you choose to pursue Rails development further.

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In the last section, you put together a basic web application that allowed you to create, edit, list, and delete diary entries. You used scaffolding, which let you put a whole working application together with no direct coding effort required. In this section, you re going to look at what the scaffolding generated, how it works, and how you can extend the application a little.

Article.where("title = 'Advanced Active Record'")

Pagination is the process of dividing up a result set into groups of pages, and you ll find examples of it all over the web. Google uses pagination to show you ten results per page for any query. Since it s so common in web development, Rails includes a pagination helper. Here s an example from the index action on the events controller.

The first URL you accessed within your application was http://localhost/entries/list. This URL takes you to the entries controller s list method. Let s look in app/controllers/ entries_controller.rb to find it: class EntriesController < ApplicationController # GET /entries # GET /entries.xml def index @entries = Entry.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @entries } end end # GET /entries/1 # GET /entries/1.xml def show @entry = Entry.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @entry } end end # GET /entries/new # GET /entries/new.xml def new @entry = Entry.new

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The paginate method returns a two-element array. In the preceding example, we re assigning each element to the @events_pages and @events instance variables, respectively. @events_pages contains the paginated object, and @events contains a collection of no more than the specified number of Event objects (in this case, 10). When it s time to display paginated results in a template, you can ask the current @events_pages object for its next and previous page and pass it to the controller via the :page parameter.

Article.order("published_at DESC")

respond_to do |format| format.html # new.html.erb format.xml { render :xml => @entry } end end # GET /entries/1/edit def edit @entry = Entry.find(params[:id]) end # POST /entries # POST /entries.xml def create @entry = Entry.new(params[:entry]) respond_to do |format| if @entry.save flash[:notice] = 'Entry was successfully created.' format.html { redirect_to(@entry) } format.xml { render :xml => @entry, :status => :created, :location => @entry } else format.html { render :action => "new" } format.xml { render :xml => @entry.errors, :status => :unprocessable_entity } end end end # PUT /entries/1 # PUT /entries/1.xml def update @entry = Entry.find(params[:id]) respond_to do |format| if @entry.update_attributes(params[:entry]) flash[:notice] = 'Entry was successfully updated.' format.html { redirect_to(@entry) } format.xml { head :ok } else format.html { render :action => "edit" } format.xml { render :xml => @entry.errors, :status => :unprocessable_entity } end end end

link_to('Previous', :page => @events_pages.current.previous) link_to('Next', :page => @events_pages.current.next)