你可能错过的 Rails 技巧 —Posted by bigcircle
记得前段时间 RailsConf2012 之后看过一个不错的pdf，10 things you didn’t know rails could do
说是10个，但是给出了42个实例，这几天抽空又回味了下，料很多，写的很好，顺便总结学习下
Pass 掉第一个 fridayhug，我们是开心拥抱每一天
%w(action_controller/railtie coderay markaby).map &method(:require)
run TheSmallestRailsApp ||= Class.new(Rails::Application) {
config.secret_token = routes.append {
root to: proc {
[200, {"Content-Type" => "text/html"}, [Markaby::Builder.new.html {
title @title = "The Smallest Rails App"
h3 "I am #@title!"
p "Here is my source code:"
div { CodeRay.scan_file(__FILE__).div(line_numbers: :table) }
p { a "Make me smaller", href: "//goo.gl/YdRpy" }
}]]
}
}.to_s
initialize!
}
2 – 提醒功能 TODO
class UsersController < ApplicationController
# TODO: Make it possible to create new users.
end
class User < ActiveRecord::Base
# FIXME: Should token really be accessible?
attr_accessible :bil, :email, :name, :token
end
执行 rake notes
app/controllers/users_controller.rb:
* [ 2] [TODO] Make it possible to create new users.
app/models/user.rb:
* [ 2] [FIXME] Should token really be accessible?
app/views/articles/index.html.erb:
* [ 1] [OPTIMIZE] Paginate this listing.
查看单独的 TODO / FIXME / OPTIMIZE
rake notes:todo
app/controllers/users_controller.rb:
* [ 2] Make it possible to create new users.
可以自定义提醒名称
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
# JEG2: Add that code from your blog here.
end
不过需要敲一长串，可以alias个快捷键
rake notes:custom ANNOTATION=JEG2
app/models/article.rb:
* [ 4]Add that code from your blog here.
3 – 沙箱模式执行 rails c
rails c --sandbox
沙箱模式会有回滚事务机制，对数据库的操作在退出之前都会自动回滚到之前未修改的数据
4 – 在 rails c 控制台中使用 rails helper 方法
$ rails c
Loading development environment (Rails 3.2.3)
>> helper.number_to_currency(100)
=> "$100.00"
>> helper.time_ago_in_words(3.days.ago)
=> "3 days"
5 – 开发模式用 thin 代替 webrick
group :development do
gem 'thin'
end
rails s thin / thin start
6 – 允许自定义配置
- lib/custom/railtie.rb
module Custom
class Railtie < Rails::Railtie
config.custom = ActiveSupport::OrderedOptions.new
end
end
- config/application.rb
require_relative "../lib/custom/railtie"
module Blog
class Application < Rails::Application
# ...
config.custom.setting = 42
end
end
7 – keep funny
作者给出了个介绍 ruby 以及一些相关 blog的网站 rubydramas，搞笑的是这个网站右上角标明
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用 isitrails.com 检查了下，果然不是用 rails 做的，这个应该是作者分享 ppt 过程中的一个小插曲吧
8 -理解简写的迁移文件
rails g resources user name:string email:string token:string bio:text
字段会被默认为 string 属性，查看了下 源码，果然有初始化定义
rails g resources user name email token:string{6} bio:text
会生成用样的 migration 文件
class CreateUsers < ActiveRecord::Migration def change create_table :users do |t| t.string :name t.string :email t.string :token, :limit => 6
t.text :bio
t.timestamps
end
end
end
9 – 给 migration 添加索引
rails g resource user name:index email:uniq token:string{6} bio:text
会生成 name 和 email 的索引，同时限定 email 唯一
class CreateUsers < ActiveRecord::Migration def change create_table :users do |t| t.string :name t.string :email t.string :token, :limit => 6
t.text :bio
t.timestamps
end
add_index :users, :name
add_index :users, :email, :unique => true
end
end
10 – 添加关联关系
rails g resource article user:references subject body:text
会自动关联生成对应的 belongs_to 和 外键，并添加索引
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.references :user
t.string :subject
t.text :body
t.timestamps
end
add_index :articles, :user_id
end
end
class Article < ActiveRecord::Base
belongs_to :user
attr_accessible :body, :subject
end
11 – 显示数据迁移记录
rake db:migrate:status
会输出 migration 的状态，这在解决迁移版本冲突的时候很有用
database: db/development.sqlite3
status Migration ID Migration Name
---------------------------------------
up 20120414155612 Create users
up 20120414160528 Create articles
down 20120414161355 Create comments
12 – 导入 csv 文件
csv 文件内容如下
Name,Email
James,james@example.com
Dana,dana@example.com
Summer,summer@example.com
创建 rake 任务导入 users 表
require 'csv'
namespace :users do
desc "Import users from a CSV file"
task :import => :environment do
path = ENV.fetch("CSV_FILE") {
File.join(File.dirname(__FILE__), *%w[.. .. db data users.csv])
}
CSV.foreach(path, headers: true, header_converters: :symbol) do |row|
User.create(row.to_hash)
end
end
end
13 – 数据库中储存 csv
class Article < ActiveRecord::Base
require 'csv'
module CSVSerializer
module_function
def load(field); field.to_s.parse_csv; end
def dump(object); Array(object).to_csv; end
end
serialize :categories, CSVSerializer
attr_accessible :body, :subject, :categories
end
serialize 用于在文本字段储存序列化的值，如序列，Hash，Array等，例如
user = User.create(:preferences => { "background" => "black", "display" => large })
User.find(user.id).preferences # => { "background" => "black", "display" => large }
这个例子中将 CSVSerializer to_csv序列化之后储存在 categories 这个文本类型字段中
14 – 用 pluck 查询
$ rails c
loading development environment(Rails 3.2.3)
>> User.select(:email).map(&:email)
User Load(0.1ms) SELECT email FROM "users"
=> ["james@example.com", "dana@example.com", "summer@example.com"]
>> User.pluck(:email)
(0.2ms) SELECT email FROM "users"
=> ["james@example.com", "dana@example.com", "summer@example.com"]
>> User.uniq.pluck(:email)
(0.2ms) SELECT DISTINCT email FROM "users"
=> ["james@example.com", "dana@example.com", "summer@example.com"]
pluck 的实现方式其实也是 select 之后再 map
def pluck(column_name)
column_name = column_name.to_s
klass.connection.select_all(select(column_name).arel).map! do |attributes|
klass.type_cast_attribute(attributes.keys.first, klass.initialize_attributes(attributes))
end
end
15 – 使用 group count
创建 article 关联 model event
rails g resource event article:belongs_to triggle
创建3条 edit 记录和10条 view 记录。 Event.count 标明有13条记录，
group(:triggle).count 表示统计 triggle group 之后的数量，也可以用 count(:group => :trigger)
$ rails c
>> article = Article.last
=> #<article id:1="">>> {edit:3, view:10}.each do |trigger, count| ?> count.times do ?> Event.new(trigger: trigger).tap{ |e| e.article= article; e.save! } ?> end => {:edit => 3, :view => 10} >> Event.count => 13 >> Event.group(:trigger).count => {"edit" => 3, "view" => 10}</article>
16 – 覆盖关联关系
class Car < ActiveRecord::Base
belongs_to :owner
belongs_to :previous_owner, class_name: "Owner"
def owner=(new_owner)
self.previous_owner = owner
super
end
end
car更改 owner 时，如果有了 new_owner，就把原 owner 赋给 previous_owner，注意要加上 super
17 – 构造示例数据
$ rails c
Loading development environment (Rails 3.2.3)
>> User.find(1)
=> #
>> jeg2 = User.instantiate("id" => 1, "email" => "
=> #
>> jeg2.name = "James Edward Gray II"
=> "James Edward Gray II"
>> jeg2.save!
=> true
>> User.find(1)
james@example.com", ...>
伪造一条记录，并不是数据库中的真实数据，也不会把原有数据覆盖
18 – PostgreSQL 中使用无限制的 string
去掉适配器中对 string 长度的限制，这个应该是 PostgreSQL 数据库的特性
module PsqlApp
class Application < Rails::Application
# Switch to limitless strings
initializer "postgresql.no_default_string_limit" do
ActiveSupport.on_load(:active_record) do
adapter = ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
adapter::NATIVE_DATABASE_TYPES[:string].delete(:limit)
end
end
end
end
创建 user 表，bio 字符串
rails g resource user bio
$ rails c
Loading development environment (Rails 3.2.3)
>> very_long_bio = "X" * 10_000; :set
=> :set
>> User.create!(bio: very_long_bio)
=> #
>> User.last.bio.size
=> 10000
19 – PostgreSQL 中使用全文搜
rails g resource article subject body:text
更改迁移文件，添加索引和 articles_search_update 触发器
class CreateArticles < ActiveRecord::Migration
def change
create_table :articles do |t|
t.string :subject
t.text :body
t.column :search, "tsvector"
t.timestamps
end
execute <
Model 中添加 search 方法
class Article < ActiveRecord::Base
attr_accessible :body, :subject
def self.search(query)
sql = sanitize_sql_array(["plainto_tsquery('english', ?)", query])
where(
"search @@ #{sql}"
).order(
"ts_rank_cd(search, #{sql}) DESC"
)
end
end
PostgreSQL 数据库没用过，这段看例子吧
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Full Text Search")
=> #<article id:="" 1="">>> Article.create!(body: "A stemmed search.") => #<article id:="" 2="">>> Article.create!(body: "You won't find me!") => #<article id:="" 3="">>> Article.search("search").map { |a| a.subject || a.body } => ["Full Text Search", "A stemmed search."] >> Article.search("stemming").map { |a| a.subject || a.body } => ["A stemmed search."]</article></article></article>
21 – 每个用户使用不同的数据库
- user_database.rb
def connect_to_user_database(name)
config = ActiveRecord::Base.configurations["development"].merge("database" => "db/#{name}.sqlite3")
ActiveRecord::Base.establish_connection(config)
end
创建 rake 任务：新增用户数据库和创建
require "user_database"
namespace :db do
desc "Add a new user database"
task :add => %w[environment load_config] do
name = ENV.fetch("DB_NAME") { fail "DB_NAME is required" }
connect_to_user_database(name)
ActiveRecord::Base.connection
end
namespace :migrate do
desc "Migrate all user databases"
task :all => %w[environment load_config] do
ActiveRecord::Migration.verbose = ENV.fetch("VERBOSE", "true") == "true"
Dir.glob("db/*.sqlite3") do |file|
next if file == "db/test.sqlite3"
connect_to_user_database(File.basename(file, ".sqlite3"))
ActiveRecord::Migrator.migrate(
ActiveRecord::Migrator.migrations_paths,
ENV["VERSION"] && ENV["VERSION"].to_i
) do |migration|
ENV["SCOPE"].blank? || (ENV["SCOPE"] == migration.scope)
end
end
end
end
end
执行几个rake 任务创建不同的数据库
$ rails g resource user name
$ rake db:add DB_NAME=ruby_rogues
$ rake db:add DB_NAME=grays
$ rake db:migrate:all
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0008s
== CreateUsers: migrated (0.0008s) =========================
== CreateUsers: migrating ==================================
-- create_table(:users)
-> 0.0007s
== CreateUsers: migrated (0.0008s) =========================
创建几条记录，为不同的数据库创建不同的数据
$ rails c
>> connect_to_user_database("ruby_rogues")
=> #
>> User.create!(name: "Chuck")
=> #
>> User.create!(name: "Josh")
=> #
>> User.create!(name: "Avdi")
=> #
...
>> connect_to_user_database("grays")
=> #
>> User.create!(name: "James")
=> #
>> User.create!(name: "Dana")
=> #
>> User.create!(name: "Summer")
=> #
ApplicationController 里面添加 before_filter 根据登陆的二级域名判断连接哪个数据库
class ApplicationController < ActionController::Base
protect_from_forgery
before_filter :connect_to_database
private
def connect_to_database
connect_to_user_database(request.subdomains.first)
end
end
中场休息时，去找了下 RailsConf 2012 的视频看了看，刚好看到关于 这篇 的介绍，片子还挺长，41分钟，演讲者长相和声音都很不符合大家对 Rails 的认知，大家有兴趣的可以去听听
21 – 自动写文件
class Comment < ActiveRecord::Base
# ...
Q_DIR = (Rails.root + "comment_queue").tap(&:mkpath)
after_save :queue_comment
def queue_comment
File.atomic_write(Q_DIR + "#{id}.txt") do |f|
f.puts "Article: #{article.subject}"
f.puts "User: #{user.name}"
f.puts body
end
end
end
找了下 Api 是 Rails 对 Ruby 基础类的扩展
22 – 合并嵌套 Hash
$ rails c
Loading development environment (Rails 3.2.3)
>> {nested: {one: 1}}.merge(nested: {two: 2})
=> {:nested=>{:two=>2}}
>> {nested: {one: 1}}.deep_merge(nested: {two: 2})
=> {:nested=>{:one=>1, :two=>2}}
主要是用到了 deep_merge 合并相同的 key
23 – Hash except
$ rails c
Loading development environment (Rails 3.2.3)
>> params = {controller: "home", action: "index", from: "Google"}
=> {:controller=>"home", :action=>"index", :from=>"Google"}
>> params.except(:controller, :action)
=> {:from=>"Google"}
这个方法经常会用到，可能用的人也很多
24 – add defaults to Hash
$ rails c
Loading development environment (Rails 3.2.3)
>> {required: true}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true}.reverse_merge(optional: true)
=> {:optional=>true, :required=>true}
>> {required: true, optional: false}.merge(optional: true)
=> {:required=>true, :optional=>true}
>> {required: true, optional: false}.reverse_merge(optional: true)
=> {:optional=>false, :required=>true}
这几个都是对 Hash 类的增强，merge 会替换原有相同 key 的值，但 reverse_merge 不会
从源码就可以看出，会事先 copy 一份 default hash
def reverse_merge(other_hash)
super
self.class.new_from_hash_copying_default(other_hash)
end
25 – String.value? 方法
看下面的几个例子
$ rails c
Loading development environment (Rails 3.2.3)
>> env = Rails.env
=> “development”
>> env.development?
=> true
>> env.test?
=> false
>> “magic”.inquiry.magic?
=> true
>> article = Article.first
=> #
>> article.draft?
=> true
>> article.published?
=> false
env, “magic” 可以直接使用 value? 的方法，这个扩展是 String#inquiry 方法
def inquiry
ActiveSupport::StringInquirer.new(self)
end
# 用method_missing 实现
def method_missing(method_name, *arguments)
if method_name.to_s[-1,1] == "?"
self == method_name.to_s[0..-2]
else
super
end
end
类型的一个例子，同样用到了 inquiry 方法
class Article < ActiveRecord::Base
# ...
STATUSES = %w[Draft Published]
validates_inclusion_of :status, in: STATUSES
def method_missing(method, *args, &block)
if method =~ /\A#{STATUSES.map(&:downcase).join("|")}\?\z/
status.downcase.inquiry.send(method)
else
super
end
end
end
26 - 让你成为杂志的封面 （暖场之用）
搞笑哥拿出了 DHH 当选 Linux journal 杂志封面的图片，会场也是哄堂大笑 ^.^
27 – 隐藏注释
<h1>Home Page</h1>
# 生成的 html<!-- HTML comments stay in the rendered content -->
<h1>Home Page</h1>
这个一下没看懂。。试了下项目里面的代码，原来是隐藏的意思。。 28 – 理解更短的 erb 语法
# ...
module Blog
class Application < Rails::Application
# Broken: config.action_view.erb_trim_mode = '%'
ActionView::Template::Handlers::ERB.erb_implementation =
Class.new(ActionView::Template::Handlers::Erubis) do
include ::Erubis::PercentLineEnhancer
end
end
end
end
接着在 view 页面替换用 % 表示原来，有点像 slim
% if current_user.try(:admin?)
% end
29 – 用 block 避免视图层赋值
<table>
<% @cart.products.each do |product| %>
<tr>
<td><%= product.name %></td>
<td><%= number_to_currency product.price %></td>
</tr>
<% end %>
<tr>
<td>Subtotal</td>
<td><%= number_to_currency @cart.total %></td>
</tr>
<tr>
<td>Tax</td>
<td><%= number_to_currency(tax = calculate_tax(@cart.total)) %></td>
</tr>
<tr>
<td>Total</td>
<td><%= number_to_currency(@cart.total + tax) %></td>
</tr>
</table>
tax = calculate_tax(@cart.total) 会先被赋值再被下面引用 用 block 重构下，把逻辑代码放到 helper 里面
module CartHelper
def calculate_tax(total, user = current_user)
tax = TaxTable.for(user).calculate(total)
if block_given?
yield tax
else
tax
end
end
end
<table>
<% @cart.products.each do |product| %>
<tr>
<td><%= product.name %></td>
<td><%= number_to_currency product.price %></td>
</tr>
<% end %>
<tr>
<td>Subtotal</td>
<td><%= number_to_currency @cart.total %></td>
</tr>
<% calculate_tax @cart.total do |tax| %>
<tr>
<td>Tax</td>
<td><%= number_to_currency tax %></td>
</tr>
<tr>
<td>Total</td>
<td><%= number_to_currency(@cart.total + tax) %></td>
</tr>
<% end %>
</table>
30 – 同时生成多个标签
<h1>Articles</h1>
<% @articles.each do |article| %>
<%= content_tag_for(:div, article) do %>
<h2><%= article.subject %></h2>
<% end %>
<% end %>
<%= content_tag_for(:div, @articles) do |article| %>
<h2><%= article.subject %></h2>
<% end %>
content_tag_for 具体用法可以参考 Api，意思比较明白 to_partial_path 是 ActiveModel 內建的实例方法，返回一个和可识别关联对象路径的字符串，原文是这么说的，目前还没看明白这么用的目的在哪
这篇 blog 介绍了4个最喜欢的 Rails3.2 隐藏特性，
这4条都在这个系列中，作者可能也是从这学来的吧
31 – Render Any Object
class Event < ActiveRecord::Base
# ...
def to_partial_path
"events/#{trigger}" # events/edit or events/view
end
end
to_partial_path 是 ActiveModel 內建的实例方法，返回一个和可识别关联对象路径的字符串，原文是这么说的，目前还没看明白这么用的目的在哪
Returns a string identifying the path associated with the object.
ActionPack uses this to find a suitable partial to represent the object.
32 – 生成 group option
%w[One Two Three],
"Group B" => %w[One Two Three]
) ) %>
这个其实就是用到了 grouped_options_for_select ，我在前面的 博文 提到过这几个 select 的用法
33 -定制你自己喜欢的 form 表单
class LabeledFieldsWithErrors < ActionView::Helpers::FormBuilder
def errors_for(attribute)
if (errors = object.errors[attribute]).any?
@template.content_tag(:span, errors.to_sentence, class: "error")
end
end
def method_missing(method, *args, &block)
if %r{ \A (?labeled_)?
(?\w+?)
(?_with_errors)? \z }x =~ method and
respond_to?(wrapped) and [labeled, with_errors].any?(&:present?)
attribute, tags = args.first, [ ]
tags << label(attribute) if labeled.present?
tags << send(wrapped, *args, &block)
tags << errors_for(attribute) if with_errors.present?
tags.join(" ").html_safe
else
super
end
end
end
定义了几个不想去看懂的 method_missing 方法。。 修改 application.rb，添加配置
class Application < Rails::Application
# ...
require "labeled_fields_with_errors"
config.action_view.default_form_builder = LabeledFieldsWithErrors
config.action_view.field_error_proc = ->(field, _) { field }
end
创建 form 表单可以这样书写
<%= form_for @article do |f| %>
<p><%= f.text_field
<p><%= f.labeled_text_field
<p><%= f.text_field_with_errors
<p><%= f.labeled_text_field_with_errors :subject %></p>
<%= f.submit %>
<% end %>
生成如下的 html 页面
<p><input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p>
<p><label for="article_subject">Subject</label>
<input id="article_subject" name="article[subject]" size="30" type="text" value="" /></p>
<p><input id="article_subject" name="article[subject]" size="30" type="text" value="" />
<span class="error">can't be blank</span></p>
<p><label for="article_subject">Subject</label>
<input id="article_subject" name="article[subject]" size="30" type="text" value="" />
<span class="error">can't be blank</span></p>
<!-- ... -->
不是很喜欢这种方式，反而把简单的html搞复杂了，让后来维护的人增加额外的学习成本 不是很喜欢这种方式，反而把简单的html搞复杂了，让后来维护的人增加额外的学习成本
34 - Inspire theme songs about your work (再次暖场时刻)
2011年 Farmhouse Conf 上主持人 Ron Evans 专门用口琴演奏了为大神 Tenderlove 写的歌 - Ruby Hero Tenderlove! ，听了半天不知道唱的啥。。 想找下有没有美女 Rubist, 看了下貌似没有，都是大妈，这位 Meghann Millard 尚可远观，大姐装束妖娆，手握纸条，蚊蝇环绕，不时微笑，长的真有点像 gossip girl 里面的 Jenny Humphrey
35 - 灵活的异常操作
修改 application.rb 定义
class Application < Rails::Application
# ...
config.exceptions_app = routes
end
每次有异常时路由都会被调用，你可以用下面的方法简单 render 404 页面
match "/404", :to => "errors#not_found"
这个例子也在开头提到的那篇博文里面，感兴趣可以去自己研究下
36 – 给 Sinatra 添加路由
- Gemfile
source 'https://rubygems.org'
# ...
gem "resque", require: "resque/server"
module AdminValidator
def matches?(request)
if (id = request.env["rack.session"]["user_id"])
current_user = User.find_by_id(id)
current_user.try(:admin?)
else
false
end
end
end
挂载 Resque::Server 至 /admin/resqu
Blog::Application.routes.draw do
# ...
require "admin_validator"
constraints AdminValidator do
mount Resque::Server, at: "/admin/resque"
end
end
这个也没有试验，不清楚具体用法，sinatra 平时也基本不用
37 – 导出CSV流
class ArticlesController < ApplicationController
def index
respond_to do |format|
format.html do
@articles = Article.all
end
format.csv do
headers["Content-Disposition"] = %Q{attachment; filename="articles.csv"}
self.response_body = Enumerator.new do |response|
csv = CSV.new(response, row_sep: "\n")
csv << %w[Subject Created Status]
Article.find_each do |article|
csv << [ article.subject,
article.created_at.to_s(:long),
article.status ]
 end
end
end
end
end
# ...
end
导出 csv 是很常用的功能，很多时候报表都需要，这个还是比较实用的
38 - do some work in the background
给 articles 添加文本类型 stats 字段
rails g migration add_stats_to_articles stats:text
添加一个计算 stats 方法 和 一个 after_create 方法，在创建一条记录后，会把 calculate_stats 添加到 Queue 队列，当队列中有任务时，后台创建一个线程执行该 job
class Article < ActiveRecord::Base
# ...
serialize :stats
def calculate_stats
words = Hash.new(0)
body.to_s.scan(/\S+/) { |word| words[word] += 1 }
sleep 10 # simulate a lot of work
self.stats = {words: words}
end
require "thread"
def self.queue; @queue ||= Queue.new end
def self.thread
@thread ||= Thread.new do
while job = queue.pop
job.call
end
end
end
thread # start the Thread
after_create :add_stats
def add_stats
self.class.queue << -> { calculate_stats; save }
end
end
添加一条记录，10秒后会自动给该记录 stats 字段添加 words Hash
$ rails c
Loading development environment (Rails 3.2.3)
>> Article.create!(subject: "Stats", body: "Lorem ipsum...");
Time.now.strftime("%H:%M:%S")
=> "15:24:10"
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=> [nil, "15:24:13"]
>> [Article.last.stats, Time.now.strftime("%H:%M:%S")]
=>[{:words=>{"Lorem"=>1, "ipsum"=>1, ...}, "15:24:26"]
39 – 用 Rails 生成静态站点
修改 config/environment/development.rb
Static::Application.configure do
# ...
# Show full error reports and disable caching
config.consider_all_requests_local = true
config.action_controller.perform_caching = !!ENV["GENERATING_SITE"]
# ...
# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = !ENV["GENERATING_SITE"]
# Generate digests for assets URLs
config.assets.digest = !!ENV["GENERATING_SITE"]
# ...
end
class ApplicationController < ActionController::Base
protect_from_forgery
if ENV["GENERATING_SITE"]
after_filter do |c|
c.cache_page(nil, nil, Zlib::BEST_COMPRESSION)
end
end
end
修改 rake static:generate 任务
require "open-uri"
namespace :static do
desc "Generate a static copy of the site"
task :generate => %w[environment assets:precompile] do
site = ENV.fetch("RSYNC_SITE_TO") { fail "Must set RSYNC_SITE_TO" }
server = spawn( {"GENERATING_SITE" => "true"},
"bundle exec rails s thin -p 3001" )
sleep 10 # FIXME: start when the server is up
# FIXME: improve the following super crude spider
paths = %w[/]
files = [ ]
while path = paths.shift
files << File.join("public", path.sub(%r{/\z}, "/index") + ".html")
File.unlink(files.last) if File.exist? files.last
files << files.last + ".gz"
File.unlink(files.last) if File.exist? files.last
page = open("http://localhost:3001#{path}") { |url| url.read }
page.scan(/]+href="([^"]+)"/) do |link|
paths << link.first
end
end
system("rsync -a public #{site}")
Process.kill("INT", server)
Process.wait(server)
system("bundle exec rake assets:clean")
files.each do |file|
File.unlink(file)
end
end
end
生成到某个地方，去查看吧
rake static:generate RSYNC_SITE_TO=/Users/james/Desktop
后面几个都不感兴趣，没有测试，说好的42个，瞎扯了3个pass掉了，实在是吐血了
Over.
