Read e-book online Objects on Rails PDF

By Avdi Grimm

This booklet is aimed toward the operating Rails developer who's trying to develop and evolve Rails initiatives whereas maintaining them versatile, maintainable, and powerful. the focal point is on pragmatic recommendations which tread a "middle way" among the expedience of the Rails "golden path", and inflexible OO purity.

Show description

Read or Download Objects on Rails PDF

Best programming books

Download PDF by Bill Dudney, Chris Adamson: iPhone SDK Development

Packing the ability of laptop functions right into a small cellular equipment, the iPhone SDK deals builders the power to create dynamic, visually-appealing, and highly-capable cellular purposes, utilizing a similar APIs and instruments that Apple makes use of for its personal applications.

notwithstanding, harnessing that energy skill studying new instruments, new APIs, or even a complete new programming language.

iPhone SDK improvement is a practical advisor to get you begun constructing functions for iPhone and iPod contact. With it, you'll get a whole knowing of the instruments and methods had to be triumphant at the platform:

* Use the XCode IDE to regulate your resource code, pictures, sounds, database documents, and different software assets, construction your app and deploying it onto your individual gadget for testing.

* increase your consumer interface the visible, code-free means, with Interface Builder.

* grasp the iPhone's detailed person interface elements, together with tables, tab bars, navigation bars, and the multi-touch interface.

* attach your iPhone to the surface global with networking, take advantage of the ability of a relational database with SQLite, and rock out with top notch help for audio and video.

* utilize the iPhone's exact cellular APIs, like geolocation and the motion-sensing accelerometer

* Use XCode's strong functionality and debugging instruments to do away with reminiscence leaks, zombies, and different hazards.

* comprehend the method for packaging your software for end-user distribution via Apple's App Store.

With reasons of the massive photo and an eye fixed to the little information that you'll want, _iPhone SDK Development_ might help you be triumphant on today's most vital cellular platform.

How Debuggers Work: Algorithms, Data Structures, and - download pdf or read online

A complete consultant to debuggers: what they do, how they paintings, and the way to exploit them to supply larger courses

"Debuggers are the magnifying glass, the microscope, the common sense analyzer, the profiler, and the browser with which a software should be tested. "-Jonathan B. Rosenberg

Debuggers are an fundamental instrument within the improvement procedure. in reality, through the process the typical software program undertaking, extra hours are spent debugging software program than in compiling code. but, no longer many programmers relatively understand how to constructively interpret the implications they come again from debuggers. or even fewer be aware of what makes those complicated suites of algorithms and knowledge buildings tick. Now during this super obtainable consultant, Jonathan B. Rosenberg demystifies debuggers for programmers and exhibits them tips on how to make larger use of debuggers of their subsequent projects.

Taking a hands-on, problem-solving method of a posh topic, Rosenberg explains how debuggers paintings and why programmers use them. most significantly, he presents useful discussions of debugger algorithms and strategies for his or her use, followed via many sensible examples. the writer additionally discusses a large choice of structures functions, from Microsoft's Win32 debug API to a wide parallel structure.

Read e-book online C# 3.0: The Complete Reference PDF

With its help for Language-Integrated question (LINQ), C# three. zero has revolutionized C# programming, and bestselling writer Herb Schildt has up to date and improved his vintage programming connection with disguise it. utilizing rigorously crafted factors, insider guidance, and hundreds and hundreds of examples, this publication offers in-depth insurance of all facets of C#, together with its key words, syntax, and middle libraries.

Download PDF by Dirk Riehle (auth.), James Noble, Ralph Johnson, Paris: Transactions on Pattern Languages of Programming II: Special

The Transactions on development Languages of Programming subline goals to submit papers on styles and trend languages as utilized to software program layout, improvement, and use, all through all levels of the software program existence cycle, from standards and layout to implementation, upkeep and evolution. the first concentration of this LNCS Transactions subline is on styles, trend collections, and trend languages themselves.

Additional resources for Objects on Rails

Sample text

57 Oh by the way, that post_source? It’s a factory, as in “the Factory pattern”. I didn’t want to scare you off with big pattern talk, so I snuck it in under an assumed name ;-) 57 Sorting and limiting posts OK, now we have timestamps on the posts. On a proper blog, posts are listed in reverse-chronological order, with the most recent post at the top. Let’s implement sorting by timestamp, and while we’re at it, let’s limit the display to the ten most recent posts. rb # ... wont_include(oldest) end end # ...

Each do |k,v| send("#{k}=",v) end end # ... end Listing 20: Implementing keyword arguments Now we just need to update the views to show our posts. body %>

Listing 22: The Blog entry partial Reloading the page, we can see our demo entries. 36 ADDING BLOG ENTRIES 37 Figure 2: Showing entries 37 Submitting posts This is progress, but a blog with static entries doesn’t do us a lot of good. We need to be able to submit new entries. First we’ll add a “New post” link. -- ... -- ... rb # ...

The upgrade goes easily, and everything is working great. Then one day a clever user realizes that if he can guess the ID of someone else’spost, he can modify its content! Why is this possible? find() bypassed any scope constraints imposed by accessing posts from a Blog instance instead of fetching them directly. These are not hypothetical issues; I’ve seen them in production codebases. Using different terms for “the blog’s entries” and “a Post object” doesn’t automatically fix the problem. But if they mentally trip us up a bit, that might just be the nudge we need to remember that the entries managed by a blog are not necessarily equivalent to the set of all Post records.

Download PDF sample

Objects on Rails by Avdi Grimm

by Kevin

Rated 4.06 of 5 – based on 13 votes