By Avdi Grimm

This publication is geared toward the operating Rails developer who's seeking to develop and evolve Rails initiatives whereas conserving them versatile, maintainable, and strong. the point of interest is on pragmatic suggestions which tread a "middle way" among the expedience of the Rails "golden path", and inflexible OO purity.

Show description

Read Online or Download Objects on Rails PDF

Similar programming books

Learning to Program with MATLAB: Building GUI Tools - download pdf or read online

Author Craig Lent’s 1st version of studying to application with MATLAB: development GUI instruments teaches the middle recommendations of machine programming, equivalent to arrays, loops, functionality, uncomplicated information buildings, and so on. , utilizing MATLAB. The textual content has a spotlight at the basics of programming and builds as much as an emphasis on GUI instruments, protecting text-based courses first, then courses that produce images. This creates a visible expression of the underlying arithmetic of an issue or layout. short and to-the-point, the textual content comprises fabric that may be switched over with supplementary reference fabric designed to attract clients to continue their copy.

Read e-book online PHP Web Services: APIs for the Modern Web (2nd Edition) PDF

Even if you're sharing facts among inner platforms or construction an API in order that clients can entry their information, this useful consultant has every thing you want to construct APIs with Hypertext Preprocessor. writer Lorna Jane Mitchell offers plenty of hands-on code samples, real-world examples, and recommendation in accordance with her large event to steer you thru the process—from the underlying thought to tools for making your provider powerful.

Download e-book for kindle: On Conceptual Modelling: Perspectives from Artificial by John Mylopoulos, Hector J. Levesque (auth.), Michael L.

The growing to be call for for platforms of ever-increasing complexity and precision has encouraged the necessity for better point ideas, instruments, and strategies in each sector of computing device technology. a few of these components, particularly synthetic Intelligence, Databases, and Programming Lan­ guages, are trying to satisfy this call for through defining a brand new, extra summary point of method description.

Extra info for Objects on Rails

Example text

51 ADDING TIMESTAMPS 52 # ... describe "#pubdate" do # ... describe "after publishing" do before do @clock = stub! blog = stub! publish(@clock) end # ... must_equal(@now) end end end # ... Listing 43: Specifying timestamp correctness That’s a lot of test setup; any more and we’d want to find a way to refactor the tests. Now, besides creating a stubbed blog instance, we’re also creating a @clock stub. We create a fixed @now time for the clock to respond with when #now is called on it. Then we pass the clock into the Post#publish method and assert that it uses the @now time to set its #pubdate attribute.

Rejecting them has serious implications for extensibility, as well as for security and correctness. That’s why I regard any bare references to a class as a red flag, especially in Rails controller actions. I feel a lot more comfortable when I can clearly see the tree structure—trunk to limb, limb to branches, branches to twigs, twigs to leaves. 45 Getting the tests running again Unfortunately, our changes to the Posts model have broken our tests. Our nicely isolated tests don’t know where to find ActiveModel.

Method in order to present validation failures in a user-friendly way. And besides, why write that method when it’s a one-liner using ActiveModel? 61 ADDING VALIDATION 62 class Post # ... include ActiveModel::Validations validates :title, presence: true # ... end Listing 53: Implementing entry title validation with ActiveModel Now that we’re using ActiveModel to satisfy our own expectations as well as Rails’ expectations, we can no longer stub out the ActiveModel modules when running in isolation.

Download PDF sample

Objects on Rails by Avdi Grimm

by Kevin

Rated 4.82 of 5 – based on 20 votes