Download E-books Rails Recipes: Rails 3 Edition PDF

By Chad Fowler

Thousands of builders have used the 1st version of Rails Recipes to unravel difficulties identified to prevent even skilled programmers of their tracks. Now, 5 years later with Rails 3.1 published, it is time for a brand new variation of this demonstrated selection of strategies, thoroughly revised through Rails grasp Chad Fowler.

Written for amateur to intermediate Rails builders, Rails Recipes: Rails three Edition is choked with ideas to 70 of the main vexing difficulties you are more likely to face at the task. From development customized types and powering pages with JQuery to integrating with legacy databases, it is all the following. each one recipe has been up-to-date to mirror the most recent good points of Rails 3.1 and every lays out a particular approach to an issue you can be dealing with at the present time or may good come upon day after today. additionally, you will discover part the e-book is stocked with new eye-opening strategies to such universal difficulties as tips to expand Rails, try and set up your websites, or upload an internet carrier on your activities. and every recipe not just lays out a succinct resolution, yet explains its intent and the applied sciences that make it work.

Loaded with the insights of a Rails group chief, participants of the Rails center group and different specialists, this can be the e-book you need to have at your facet as you craft your subsequent project.

What You Need:

Ruby 1.8.7 or above

Rails 3.1 or above

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My standard day of programming includes again and again imagining the “perfect” resolution, imposing it, and repeating that approach. Here’s the cool half: we will be able to do that in exams. This strategy is named Test-Driven improvement, or TDD for brief. while performed correct, a few humans additionally name it Behavior-Driven improvement, or BDD. It doesn’t really count what we name it. It’s a effective method, it generates repeatable computerized checks, and it’s enjoyable. Let’s attempt including a function to our version this manner. I’d prefer to introduce the idea that of an Album to the approach. i need Songs to belong to Albums, so I’m going to exploit a has_many() dating from Album to music. as soon as that’s performed, I’d wish to be capable of ask an Album for its period, which it may get through calculating the length of the songs. First I’ll generate the version and claim the relationships: $ rails g version Album title:string artist:string invoke active_record create db/migrate/20101102002840_create_albums. rb create app/models/album. rb invoke test_unit create test/unit/album_test. rb create test/fixtures/albums. yml $ rake db:migrate (in /rr2/testing_your_models) == CreateAlbums: migrating ... == CreateAlbums: migrated (0. 0013s) The Album version itself will appear like this for now: rr2/testing_your_models/app/models/album_has_many. rb category Album < ActiveRecord::Base has_many :songs finish Now let’s cross into our new AlbumTest and look at how we'd like this selection to paintings. I frequently begin by means of making a new try out and simply writing the statement I’m document erratum • talk about 140 • checking out Recipes trying to make. that provides me a transparent target. So, i would commence with whatever like this: try out "should be capable to file period according to \ the mixed period of its songs" do assert_equal 15, album. length finish We haven’t even exact what album is assigned to but, so this isn’t sufficient code. yet we will bet that we’re going to have a few example of Album on which we’ll manage to name a mode referred to as duration(). additionally, detect how descriptive the attempt identify is. We’re specifying a habit we think from the approach, not only naming a section of code we’re operating. Readers of this code later can be in a position to learn the try out identify and comprehend what the code does. Let’s code the remainder of the try out: rr2/testing_your_models/test/unit/album_test. rb try out "should have the ability to file period established \ at the mixed period of its songs" do album = Album. create three. occasions do album. songs. create(:duration_in_seconds => five) finish assert_equal 15, album. period finish If we run our exams now, we see an blunders complaining that the duration() process doesn’t exist on Album. That’s what we anticipated. We wrote a try out for it after which ran the attempt to ensure it wasn’t already there. Now it’s time to write down that procedure within the Album category. rr2/testing_your_models/app/models/album. rb def length songs. sum(&:duration_in_seconds) finish One little try out and one little technique to make it move. great and easy. That’s the rhythm of Test-Driven improvement. trying out is a deep subject, and there are numerous instruments and tips surrounding it.

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