By Dave Thomas, David Heinemeier Hansson, Sam Ruby
Rails simply retains on altering. either Rails three and four, in addition to Ruby 1.9 and 2.0, carry countless numbers of advancements, together with new APIs and great functionality improvements. The fourth variation of this award-winning vintage has been reorganized and refocused so it's extra worthwhile than ever ahead of for builders new to Ruby and Rails.
Rails four introduces a couple of user-facing alterations, and the publication has been up to date to compare the entire most modern adjustments and new most sensible practices in Rails. This comprises complete help for Ruby 2.0, controller matters, Russian Doll caching, powerful parameters, Turbolinks, new try and bin listing layouts, and masses more.
Ruby on Rails is helping you produce fine quality, beautiful-looking internet functions fast. you think about growing the applying, and Rails looks after the details.
Tens of millions of builders have used this award-winning publication to benefit Rails. It's a extensive, far-reaching educational and reference that's instructed via the Rails middle workforce. If you're new to Rails, you'll get step by step assistance. If you're an skilled developer, this ebook offers you the excellent, insider details you need.
Rails has advanced through the years, and this e-book has developed in addition to it. We nonetheless commence with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails gains. This version now provides new Ruby and Rails clients additional information at the Ruby language and takes extra time to give an explanation for key techniques all through. top practices on find out how to practice Rails proceed to alter, and this version retains up. Examples use issues, Russian Doll caching, and Turbolinks, and the ebook focuses all through at the correct technique to use Rails. also, this variation now works on Ruby 2.0, a brand new unlock of Ruby with giant sensible and function improvements.
This variation is for Rails4.0 and beyond.
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Extra info for Agile Web Development with Rails 4 (Facets of Ruby)
P> There’s a link_to() call within an ERB <%=…%> sequence. This creates a link to a URL that will invoke the goodbye() action. The first parameter in the call to link_to() is the text to be displayed in the hyperlink, and the next parameter tells Rails to generate the link to the goodbye() action. Let’s stop for a minute to consider how we generated the link. We wrote this: link_to "Goodbye", say_goodbye_path First, link_to() is a method call. ) If you come from a language such as Java, you might be surprised that Ruby doesn’t insist on parentheses around method parameters.
When an object receives a message, it looks into its own class for a corresponding method. add_line_item(next_purchase) submit_tag "Add to Cart" Parentheses are generally optional in method calls. In Rails applications, you’ll find that most method calls involved in larger expressions will have parentheses, while those that look more like commands or declarations tend not to have them. Methods have names, as do many other constructs in Ruby. Names in Ruby have special rules, rules that you may not have seen if you come to Ruby from another language.
Ruby also provides means for defining collections of arbitrary objects via arrays and hashes. Arrays and Hashes Ruby’s arrays and hashes are indexed collections. Both store collections of objects, accessible using a key. With arrays, the key is an integer, whereas hashes support any object as a key. Both arrays and hashes grow as needed to hold new elements. It’s more efficient to access array elements, but hashes provide more flexibility. Any particular array or hash can hold objects of differing types; you can have an array containing an integer, a string, and a floating-point number, for example.