it-ebooks - Rails 102
Here you can read online it-ebooks - Rails 102 full text of the book (entire story) in english for free. Download pdf and epub, get meaning, cover and reviews about this ebook. year: 2016, publisher: iBooker it-ebooks, genre: Computer. Description of the work, (preface) as well as reviews are available. Best literature library LitArk.com created for fans of good reading and offers a wide selection of genres:
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Rails 102 — read online for free the complete book (whole text) full work
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MVC(Model)(View)(Controller)RailsMVC
MVC
Ruby on RailsRailsRubyWebMVC
- Don't Repeat Yourself
- Convention Over Configuration
http://zh.wikipedia.org/wiki/Ruby_on_Rails
Ruby1993224Ruby199512fjRubyPerlPerl6pearlRuby7ruby
RubyPerlPythonRubyRuby2000Ruby
2004RoRRubyRuby2006TIOBE
http://zh.wikipedia.org/wiki/Ruby
Ruby Coding Style
array = [ "A" , "B" , "C" , "D" ] # better array = %w(A B C D):symbool"string" Hash key
# bad { "foo" => "bar" } # good { :foo => "bar" }"string"Ruby key string object
"string" :
string1 = { "foo" => "bar" }string2 = { "foo" => "rab" }string1.each_key {|key| puts key.object_id.to_s} # => 2191071500 string2.each_key {|key| puts key.object_id.to_s} # => 2191041700:symbol :
string1 = { :foo => "bar" }string2 = { :foo => "rab" }string1.each_key {|key| puts key.object_id.to_s} # => 304828 string2.each_key {|key| puts key.object_id.to_s} # => 304828[:symbol]"string" Hash key case object
Asset Pipeline (minify) (compress) Javascript / CSS CoffeeScript / SASS / ERB assets
(assets stylesheets / javascripts / images )
Yahoo Best Practices for Speeding Up Your Web Site
- Minimize HTTP Requests
- Use a CDN
- Split Components Across Domains
- Gzip Components
- Minify JavaScript and CSS
- CSS Sprites
Rails
stylesheets_include_tag "aaa" , "bbb" , :cache => true %> javascrupt_link_tag "ccc" , "ddd" , :cache => "customized-functions" %>HTTP requests
config/enviroments/production.rb
config.asset_host = "cdn%d.example.org"- http://cdn0.example.org
- http://cdn1.example.org
- http://cdn2.example.org
- http://cdn3.example.org
CSS Bootstrap prototyping CSS JavaScript 1MB size
Rails
(trim / uglify / gzip)
:
- / (trim)
- ( uglify )
- gz
Rails asset query string invalid browser cache
image_tag( "example.gif" ) %>< img src = "/example.gif?1234567" />query string assets deploy assets query string browser URI
CDN query string
stylesheets images query string
background : url (" logo-bg .gif ");CSS CDN query string deploy CDN panel invalid assets browser
Rails 3.1 Asset Pipeline
- Fingerprinting Assets
Asset SCSS / Compass / CoffeeScript Rails
Ruby begin-end block rescue
begin # code rescue AExceptionClass => some_variable # AExceptionClass run code rescue BExceptionClass => some_other_variable # BExceptionClass run code else # run code ensure # run code endhttp://www.ruby-doc.org/core-2.1.2/Exception.html
def foo # rescue # endrails save!, create!savecreate boolean save!create!ActiveRecord::RecordInvalid
ActiveRecord::RecordInvalid
begin complex_operation_that_calls_save!_internallyrescue ActiveRecord::RecordInvalid => invalid puts invalid.record.errorsendBlockruby code{}
def block_test puts "test start" yield puts "test done" end block_test{ puts "block working here!" } # => "test start" # => "block working here!" # => "test done"blockblock_testblockyield
do....endblock
@people .each do |person| puts person.name end&& || and / or bug and or if / else boolean and / or
- foo = ( 42 && foo ) / 2
foo = && foo / => NoMethodError : undefined method '/' for nil: NilClassfood = and foo / =>next if widget = widgets.popwidget = widgets.pop and nextraise "Not ready!" unless ready_to_rock?ready_to_rock? or raise "Not ready!"- Avdi Using and and or in Ruby
# def find_book(author,title, options={}) # .... end # def word_count # .... end# link_to( "Back" , post_path(post)) # redirect_to post_path(post)# if post.content_size > # .... end # if (post.content.size > ) && post.is_promotion? # .... endRuby (space)(parentheses) Ruby parsing
Ruby super super()
class Foo def initialize(*args) args.each {|arg| puts arg} end end class Bar < Foo def initialize( a, b, c) super end end> a, b, c = * %W[a b c] > Bar .new a, b, cabc
class Foo def initialize(*args) args.each {|arg| puts arg} end end class Bar < Foo def initialize( a, b, c) super () end end> a, b, c = * %W[a b c] > Bar .new a, b, cbuilders Template Handler erb erb HTML js buildererb HTML jshandler builder XMLRSSAtom handler
Builder templates are a more programmatic alternative to ERB. They are especially useful for generating XML content. An XmlMarkup object named xml is automatically made available to templates with a .builder extension.
more programmatic alternative to ERB generate XML file tag
app/views/topics/show.xml.builder
xml.topic do |t| t.title @topic.title t.content @topic.contentendxml
< topic > < title > Topic Title </<span class="hljs-title">title > < content > Topic Content Here </<span class="hljs-title">content > </<span class="hljs-title">topic > jbuilder JSON
RSSAtom XML RSS ATOM XML Build XML RSS Tag rss version tag channel tag
app/views/topics/index.rss.builder
xml.instruct! :xml, :version => "1.0"xml.rss :version => "2.0" do xml.channel do xml.title "Rails102" xml.description "Intermediate to Rails" xml.link root_url for topic in @topics xml.item do xml.title topic.title xml.description topic.content xml.pubDate topic.created_at.to_s(:rfc822) xml.link board_topic_url(topic.board_id, topic) xml.guid board_topic_url(topic.board_id, topic) end end endendFont size:
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