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Chapter 5: Filling in the layout. Chapter 9: Updating, showing, and deleting users. Chapter Account activation and password reset. The 3rd edition of the Ruby on Rails Tutorial will follow the same basic model as previous editions: a free online version, with ebooks and screencasts available for purchase.
Perhaps the most surprising feature of the 3rd edition is that it is simultaneously easier and more advanced than previous editions. Whereas previous editions required readers to climb sometimes unavoidable brick walls, the 3rd edition is more like a ramp: smoothly increasing in difficulty, but ultimately reaching a greater height than before.
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Use of a standard integrated development environment in the cloud , with a pre-configured workspace specifically tailored to the needs of the Ruby on Rails Tutorial. The 3rd edition of the Ruby on Rails Tutorial uses the default Rails choices for all relevant technologies, thereby substantially reducing the configuration necessary to get started.
The excellent but syntactically heavy RSpec testing framework has been replaced with the default Rails testing stack MiniTest , making for a much gentler introduction to testing than in previous editions. Lighter-weight testing approach. The 3rd edition still covers test-driven development TDD , but uses it more sparingly and judiciously.
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Less emphasis on version-specific features. Rather than trying to incorporate mini-tutorials on new features for each version of Rails, the 3rd edition focuses on the most general principles of web development. This means that, although the tutorial does use the most recent Rails release, this fact is incidental, and it is not tightly coupled to the details of any particular version. By making use of features of the underlying Softcover self-publishing platform , the 3rd edition of the Ruby on Rails Tutorial now includes highlighted lines in many code samples, allowing readers to see at a glance which parts of the code are most important.
An example application might be to print a code on a letter to a customer who would then enter the code as part of the registration process for web access to their account.
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The 4th character of each part is a checkdigit, so client-side scripting can be used to highlight parts which have been mis-typed, before the code is even submitted to the application's back-end validation. The checkdigit algorithm takes into account the position of the part being keyed. So for example '1K7Q' might be valid in the first part but not in the second so if a user typed the parts in the wrong boxes then their error could be highlighted. The code generation algorithm avoids 'undesirable' codes.
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The codes are generated using a SHA1 cryptographic hash of a plaintext. In the event that an 'inappropriate' code is created, the generated hash will be used as a plaintext input for generating a new hash and the process will be repeated. The following functions can be exported from the Algorithm::CouponCode module.
No functions are exported by default. Returns a coupon code as a string of 4-character parts separated by '-' characters. The following optional named parameters may be supplied:.
A byte string which will be hashed using Digest::SHA to produce the code. If you do not supply your own plaintext then a random one will be generated for you. You can supply a regular expression for matching 4-letter words which should not appear in generated output. Takes a code, cleans it up and validates the checkdigits. Returns the normalised and untainted version of the code on success or undef on error.