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Over the course of this project, we ve explored quite a number of topics. We started out by implementing a file upload solution using the excellent plug-in attachment_fu. We next discussed and implemented a simple authentication solution that we could use to protect access

Web design is all about rectangles, to put it plainly. Every element represented visually is a rectangle of some sort. (That we aren t dealing with circles, triangles, or irregular polygons is a blessing. Be thankful.) Typically, these rectangles are placed onto the page in a way that represents their hierarchical relationship. The rectangle created by a table cell, for instance, will appear inside the one created by its table row. A parent element, then, acts as a containing block for its children.

Listing 10-3. Report Controller (app/controllers/report_controller.rb)

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This is the default rendering behavior for most elements because it s a visual conveyance of the elements semantics. Most parent-child relationships have meaning. A list item belongs to an unordered list; a legend belongs to a fieldset; a table cell belongs to a table row. As you ll learn, though, there are ways to override this default arrangement. With CSS, you can have near-perfect control of how elements are placed.

require 'tempfile' require 'gruff' class ReportController < ApplicationController def combined @rails_pdf_inline

to our application s pages and wrapped up our project by experimenting with the three different types of caching that are available within Rails. You saw how page caching is a great solution in situations where the content never (or very rarely changes) and doesn t need any level of additional processing, such as inserting dynamic content or checking authentication. We then explored action caching as a solution for still providing the benefits of caching while maintaining the ability to check authentication levels before serving the page. Action caching is a good solution where you need to be able to run before, after, or around filters for each request but don t need to be able to insert dynamic content into the page. Finally, we explored fragment caching, which allows us to cache data within the page template, thereby allowing us to use dynamic data in the pages that we deliver to the end users while still gaining many of the benefits of caching.

Before you take a look at this page, make sure you ve installed Mozilla Firefox and the Firebug extension. If you haven t, you can visit two easy-to-remember URLs: http:// getfirefox.com and http://getfirebug.com. Both tools are free, easy to install, and available on all major platforms. Save index.html, and then open it in Firefox. (You can simply drag the file into a browser window, if you like.) It won t look like much, but since you ve included Prototype on this page, you can use it as a playground. Click the icon at the bottom-right side of the screen; it should be a green circle with a check box. (If it s a gray circle, you should click it and select Enable Firebug for local files. ) Firebug will pop up a windowpane with several tabs. The one you re interested in right now is Console; it acts as a JavaScript shell, letting you run code in the context of the current page (see Figure 1-2).

@graph_files = { 'Graph of per-sale costs'=> get_sale_graph_tempfile, 'Graph of total visitors from each advertiser'=> get_visitor_graph_tempfile } # Note that the key is the label and the value is the

Let s try a couple of statements. Type in Prototype, then press Enter (see Figure 1-3).

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