Rails%203%20In%20Action

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1. GET /images/rails.png 2. Does /public/images/rails.pngg exist? Filesystem Browser Middleware ActionDispatch::Static Figure 18.4 ActionDispatch::Static request 1. GET /projects 2. Does /public/projects.html exist? 3. Nope! Filesystem Browser ActionDispatch::Static 4. Serves static asset 3. Yes! Ok, reading... ActionDispatch::BestStandardsSupport ProjectsController (other middleware) (more middleware) Ticketee::Application.routes Middleware Stack Application 6. Is shown the page for /projects 4. Sets XX-UA-Compatible UA header 5. Serves the request as usual 535 Figure 18.5 ActionDispatch::BestStandardsSupport request
536 CHAPTER 18 Rack-based applications In this request, the ActionDispatch::Static middleware first checks for the presence of public/projects.html, which would be there if you had cached the page. Because it’s not there, the request goes through the rest of the middleware stack being passed along. When it gets to ActionDispatch::Best::StandardsSupport, this middleware sets the X-UA-Compatible header and passes along the request to the application, which then serves the request like normal. Let’s dive into exactly how ActionDispatch::Static works. 18.4.2 Investigating ActionDispatch::Static The ActionDispatch::Static class is responsible for serving static requests in the development environment for your application. The code for this piece of middleware can be found in the actionpack gem, which you can view by opening the path provided by the command bundle show actionpack in your editor. The file that defines the ActionDispatch::Static middleware can be found at lib/action_dispatch/ middleware/static.rb. The first 10 lines in this file are shown inthe following listing. Listing 18.10 Listing 18.10 lib/action_dispatch/middleware/static.rb require 'rack/utils' module ActionDispatch class Static FILE_METHODS = %w(GET HEAD).freeze def initialize(app, root) @app = app @file_server = ::Rack::File.new(root) end The first line requires the rack/utilsfile, which contains the Rack::Utils module this file references a little later on. The next three lines define the ActionDispatch ::Static class and a constant called FILE_METHODS. Finally, this middleware defines the initialize method, which takes two arguments, an app and a root. This method then assigns the app argument to the @app variable so that it can be accessed in methods called after this point. The root variable is passed to a call to ::Rack::File.new 7 which is then assigned to the @file_server variable. The Rack::File class is actually a Rack application too, as you’ll see later. So why does this middleware begin in this particular way, and what is app? Well, app is the next piece of middleware in the stack that you can pass requests to if you wish. You’ll see this app variable used later. The instance of your middleware is then cached by the Rails server so it can call the call method on it when a request comes into the stack. The call method in this middleware begins with this: 7 Not-well-known Ruby fact: the double colon (::) of ::Rack::File represents a top-level class, meaning that Ruby will get the Rack::File class defined at the top level of your application, rather than one (potentially) within the current class or module.
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IN ACTION Ryan Bigg Yehuda Katz MAN
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Rails 3 in Action RYAN BIGG YEHUDA
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1 ■ Ruby on Rails, the framework
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viii 3 4 5 6 CONTENTS Developing a
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x 9 10 CONTENTS 8.5 Restricting wri
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xii 13 14 CONTENTS 12.2 Subscribing
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xiv 18 CONTENTS 17.4 Setting up a t
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xvi PREFACE cover. It also takes a
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xviii ACKNOWLEDGMENTS gnarly ePub R
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xx about this book Ruby on Rails is
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xxii ABOUT THIS BOOK By chapter 16,
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about the cover illustration The fi
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2 CHAPTER 1 Ruby on Rails, the fram
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10 CHAPTER 1 Ruby on Rails, the fra
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88 CHAPTER 4 Oh CRUD! 4.2 Editing p
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90 CHAPTER 4 Oh CRUD! 4.2.2 The upd
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94 CHAPTER 4 Oh CRUD! Figure 4.1 Ac
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98 CHAPTER 4 Oh CRUD! functionality
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100 CHAPTER 5 Nested resources New
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102 CHAPTER 5 Nested resources an e
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104 CHAPTER 5 Nested resources 5.1.
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118 CHAPTER 6 Authentication and ba
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138 CHAPTER 7 Basic access control
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212 CHAPTER 8 More authorization 45
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214 CHAPTER 9 File uploading By pro
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216 CHAPTER 9 File uploading that t
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218 CHAPTER 9 File uploading remove
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220 CHAPTER 9 File uploading This f
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222 CHAPTER 9 File uploading asset
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224 CHAPTER 9 File uploading 9.2.2
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232 CHAPTER 9 File uploading You co
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238 CHAPTER 9 File uploading Open a
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240 CHAPTER 9 File uploading This i
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244 CHAPTER 10 Tracking state used,
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246 CHAPTER 10 Tracking state group
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250 CHAPTER 10 Tracking state end @
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288 CHAPTER 11 Tagging And I press
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290 CHAPTER 11 Tagging To define th
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292 CHAPTER 11 Tagging 11.2 Adding
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300 CHAPTER 11 Tagging true, :url
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This chapter covers � Sending ema
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314 CHAPTER 12 Sending email To tes
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342 CHAPTER 12 Sending email 12.4.2
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348 CHAPTER 13 Designing an API One
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386 CHAPTER 14 Deployment done. Thi
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388 CHAPTER 14 Deployment useradd -
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390 CHAPTER 14 Deployment rvm group
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392 CHAPTER 14 Deployment To be as
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398 CHAPTER 14 Deployment The final
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402 CHAPTER 14 Deployment executing
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408 CHAPTER 14 Deployment Once Rail
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