By Sam Ruby
Ruby on Rails is helping you produce top quality, beautiful-looking internet functions quick. you consider growing the appliance, and Rails looks after the main points. Tens of millions of builders have used this award-winning publication to benefit Rails. it is a extensive, far-reaching educational and reference that is suggested by means of the Rails center workforce. if you are new to Rails, you will get step by step information. if you are an skilled developer, this publication provide you with the great, insider info you would like. Rails has advanced through the years, and this e-book has developed besides it. We nonetheless commence with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails positive factors. This variation now supplies new Ruby and Rails clients additional information at the Ruby language and takes extra time to provide an explanation for key ideas all through. top practices on how you can follow Rails proceed to alter, and this variation retains up. Examples use cookie subsidized classes, HTTP authentication, and energetic Record-based varieties, and the publication focuses all through at the correct technique to use Rails. also, this version now displays Ruby 1.9, a brand new unencumber of Ruby with enormous sensible and function advancements.
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Extra info for Agile Web Development with Rails (Pragmatic Programmers)
Here is an example: redirect_to action: "edit", id: params[:id] report erratum • discuss Data Types • 39 As you can see, a symbol looks like a variable name, but it’s prefixed with a colon. Examples of symbols include :action, :line_items, and :id. You can think of symbols as string literals that are magically made into constants. ” Now that we have used a few methods, let’s move on to how they are defined. Methods Let’s write a method that returns a cheery, personalized greeting. We’ll invoke that method a couple of times: def say_goodnight(name) result = 'Good night, ' + name return result end # Time for bed...
SQL, referred to by some as Structured Query Language, is the language used to query and update relational databases. report erratum • discuss Rails Model Support • 33 Object-Relational Mapping ORM libraries map database tables to classes. If a database has a table called orders, our program will have a class named Order. Rows in this table correspond to objects of the class—a particular order is represented as an object of class Order. Within that object, attributes are used to get and set the individual columns.
This is an example of the Rails philosophy of favoring convention over configuration. In a Rails application, an incoming request is first sent to a router, which works out where in the application the request should be sent and how the request itself should be parsed. Ultimately, this phase identifies a particular method (called an action in Rails parlance) somewhere in the controller code. The action might look at data in the request, it might interact with the model, and it might cause other actions to be invoked.
Agile Web Development with Rails (Pragmatic Programmers) by Sam Ruby