By Sam Ruby, Dave Thomas, David Heinemeier Hansson
Ruby on Rails is helping you produce top quality, beautiful-looking net functions fast. you think about developing the applying, and Rails looks after the main points. Tens of hundreds of thousands of builders have used this award-winning ebook to benefit Rails. it is a huge, far-reaching instructional and reference that is urged through the Rails middle group. in case you are new to Rails, you will get step by step suggestions. in case you are an skilled developer, this e-book provide you with the excellent, insider details you wish. Rails has developed through the years, and this ebook has advanced in addition to it. We nonetheless begin with a step by step walkthrough of creating a true program, and in-depth chapters examine the integrated Rails positive aspects. This version now provides new Ruby and Rails clients additional info at the Ruby language and takes extra time to provide an explanation for key suggestions all through. most sensible practices on tips to observe Rails proceed to alter, and this variation retains up. Examples use cookie sponsored periods, HTTP authentication, and lively Record-based types, and the booklet focuses all through at the correct option to use Rails. also, this version now displays Ruby 1.9, a brand new liberate of Ruby with monstrous sensible and function advancements.
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Extra resources for Agile Web Development with Rails (Bata 10.0 2010.10.29)
2. Rails then matches the route pattern, which it previously split into two parts and analyzed. rb). 3. The next part of the pattern, hello, identifies an action. Rails invokes a method of that name in the controller. This action method creates a new Time object holding the current time and tucks it away in the @time instance variable. 4. Rails looks for a template to display the result. erb). 5. Rails processes this file through the ERb templating system, executing any embedded Ruby and substituting in values set up by the controller.
The model is responsible for maintaining the state of the application. Sometimes this state is transient, lasting for just a couple of interactions with the user. Sometimes the state is permanent and will be stored outside the application, often in a database. A model is more than just data; it enforces all the business rules that apply to that data. For example, if a discount shouldn’t be applied to orders of less than $20, the model will enforce the constraint. This makes sense; by putting the implementation of these business rules in the model, we make sure that nothing else in the application can make our data invalid.
We don’t need code for a model, because we’re not dealing with any data. Let’s start with the controller. In the same way that we used the rails command to create a new Rails application, we can also use a generator script to create a new controller for our project. This command is called rails generate. rb The rails generate command logs the files and directories it examines, noting when it adds new Ruby scripts or directories to your application. erb file. The first source file we’ll be looking at is the controller.
Agile Web Development with Rails (Bata 10.0 2010.10.29) by Sam Ruby, Dave Thomas, David Heinemeier Hansson