ruby on rails代碼參數詳解

2020-02-24 15:40:57

字體：大中小

來源：轉載

供稿：網友

　　今天小編跟大家分享一篇ruby on rails代碼參數詳解，感興趣的朋友跟小編一起來了解一下吧!

　　git倉庫輸出

　　git archive --format=tar --prefix=actasfavor/ HEAD | (cd /home/holin/work/ && tar xf -)

　　輸出到/home/holin/work/actasfavor/目錄下

　　Posted by holin At May 16, 2008 16:42

　　加載plugins中的controller和model

　　# Include hook code here

　　require 'act_as_favor'

　　# make plugin controller, model, helper available to app

　　config.load_paths += %W(#{ActAsFavor::PLUGIN_CONTROLLER_PATH} #{ActAsFavor::PLUGIN_HELPER_PATH} #{ActAsFavor::PLUGIN_MODELS_PATH})

　　Rails::Initializer.run(:set_load_path, config)

　　# require the controller

　　require 'favors_controller'

　　# require models

　　require 'favor'

　　Posted by holin At May 15, 2008 15:36

　　使用最頻繁的前5個命令

　　history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn| head -n5

　　Posted by holin At May 15, 2008 10:40

　　按數組元素的某屬性排序

　　@users.sort!{|a, b| a.last b.last }

　　Posted by holin At May 11, 2008 14:35

　　按日期備份數據庫

　　mysqldump db_name -uroot > "/root/db_backup/kaoshi_web_`date +"%Y-%m-%d"`.sql"

　　Posted by holin At May 08, 2008 12:05

　　用memcached手動cache數據

　　sql = "SELECT * FROM blogs LIMIT 100"

　　Blog.class

　　k = MD5.new(sql)

　　@blogs = Cache.get k

　　if @blogs.blank?

　　@blogs = Blog.find_by_sql(sql)

　　Cache.put k, @blogs, 60*30 #expire after 30min

　　end

　　memcache-client 1.5.0:

　　get(key, expiry = 0)

　　put(key, value, expiry = 0)

　　Posted by devon At May 04, 2008 20:39

　　shuffle an array

　　class Array

　　def shuffle

　　sort_by { rand }

　　end

　　def shuffle!

　　self.replace shuffle

　　end

　　Posted by holin At May 04, 2008 15:39

　　讓所有的ajax請求都不render :layout

　　def render(*args)

　　args.first[:layout] = false if request.xhr? and args.first[:layout].nil?

　　super

　　end

　　Posted by devon At May 03, 2008 10:53

　　Find with Hash

　　Event.find(

　　:all,

　　:conditions => [ "title like :search or description like :search",

　　{:search => "%Tiki%"}]

　　)

　　Posted by devon At May 03, 2008 10:49

　　執行sql語句腳本

　　mysql -uroot -p123

　　use dbame;

　　delete from results;

　　delete from examings;

　　quit

　　END

　　Posted by holin At May 01, 2008 12:14

　　SQL Transaction in Rails

　　def fetch_value

　　sql = ActiveRecord::Base.connection();

　　sql.execute "SET autocommit=0";

　　sql.begin_db_transaction

　　id, value =

　　sql.execute("SELECT id, value FROM sometable WHERE used=0 LIMIT 1 FOR UPDATE").fetch_row;

　　sql.update "UPDATE sometable SET used=1 WHERE id=#{id}";

　　sql.commit_db_transaction

　　value;

　　end

　　Posted by holin At April 30, 2008 09:37

　　顯示 Flash 消息的動態效果

class="warning">

　　setTimeout("new Effect.Fade('notice');", 15000)

　　15000 毫秒后自動 notice Div 自動消失。

　　Posted by devon At April 29, 2008 13:02

　　刪除環境中的常量

　　Object.send(:remove_const, :A)

　　>> Math

　　=> Math

　　>> Object.send(:remove_const, :Math)

　　=> Math

　　>> Math

　　NameError: uninitialized constant Math

　　Posted by devon At April 28, 2008 18:24

　　手動加上 authenticity_token

　　Posted by devon At April 28, 2008 14:24

　　Rails group_by

?

　　 'article', :collection => articles %>

　　articles 按天數分組

　　Posted by devon At April 25, 2008 22:32

　　讀寫文件

　　# Open and read from a text file

　　# Note that since a block is given, file will

　　# automatically be closed when the block terminates

　　File.open('p014constructs.rb', 'r') do |f1|

　　while line = f1.gets

　　puts line

　　end

　　# Create a new file and write to it

　　File.open('test.rb', 'w') do |f2|

　　# use "/n" for two lines of text

　　f2.puts "Created by Satish/nThank God!"

　　end

　　Posted by holin At April 17, 2008 02:10

　　遍歷目錄

　　Dir.glob(File.join('app/controllers', "**", "*_controller.rb")) { |filename| puts filename }

　　Posted by holin At April 16, 2008 15:28

　　字符串到 model

　　>> 'tag_course'.camelize.constantize.find(:first)

　　=> #

　　*camelize(lower_case_and_underscored_word, first_letter_in_uppercase = true)*

　　By default, camelize converts strings to UpperCamelCase. If the argument to camelize is set to ":lower" then camelize produces lowerCamelCase.

　　*constantize(camel_cased_word)*

　　Constantize tries to find a declared constant with the name specified in the string. It raises a NameError when the name is not in CamelCase or is not initialized.

　　Posted by devon At April 07, 2008 17:32

　　調用Proc

　　a = Proc.new { |i| puts i }

　　a['haha']

　　a.call('hehe')

　　Posted by holin At March 28, 2008 23:10

　　Rails中Host靜態文件

　　config.action_controller.asset_host = "http://assets.example.com"

　　config.action_controller.asset_host = "http://assets-%d.example.com"

　　The Rails image_path and similar helper methods will then use that host to reference files in the public directory.

　　The second line will distribute asset requests across assets-0.example.com,assets-1.example.com, assets-2.example.com, and assets-3.example.com.

　　Posted by devon At March 26, 2008 18:18

　　打包gems到項目目錄中

　　$ mkdir vendor/gems

　　$ cd vendor/gems

　　$ gem unpack hpricot

　　Unpacked gem: 'hpricot-0.4'

　　config.load_paths += Dir["#{RAILS_ROOT}/vendor/gems/**"].map do |dir|

　　File.directory?(lib = "#{dir}/lib") ? lib : dir

　　end

　　Posted by devon At March 26, 2008 18:12

　　在當前上下文中執行文件中的代碼

　　instance_eval(File.read('param.txt'))

　　# such as

　　@father = 'Father'

　　instance_eval("puts @father")

　　#Produces:

　　#Father

　　Posted by holin At March 20, 2008 01:13

　　將當前文件所在目錄加入require路徑

　　$LOAD_PATH

　　# or

　　# this one puts current path before the other path.

　　$:.unshift( File.expand_path(File.dirname(__FILE__)) )

　　*__ FILE __* 當前文件路徑

　　Posted by holin At March 19, 2008 01:40

　　多字段模糊搜索

　　conditions = []

　　[:name, :school, :province, :city].each { |attr| conditions

　　conditions = conditions.any? ? conditions.collect { |c| "(#{c})" }.join(' OR ') : nil

　　在profile表里，按name, school, province, city模糊搜索

　　Posted by devon At March 17, 2008 17:25

　　nginx 啟動腳本

　　#! /bin/sh

　　# chkconfig: - 58 74

　　# description: nginx is the Nginx daemon.

　　# Description: Startup script for nginx webserver on Debian. Place in /etc/init.d and

　　# run 'sudo update-rc.d nginx defaults', or use the appropriate command on your

　　# distro.

　　# Author: Ryan Norbauer

　　# Modified: Geoffrey Grosenbach http://topfunky.com

　　# Modified: David Krmpotic http://davidhq.com

　　set -e

　　PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

　　DESC="nginx daemon"

　　NAME=nginx

　　DAEMON=/usr/local/nginx/sbin/$NAME

　　CONFIGFILE=/usr/local/nginx/conf/nginx.conf

　　DAEMON=/usr/local/nginx/sbin/$NAME

　　CONFIGFILE=/usr/local/nginx/conf/nginx.conf

　　PIDFILE=/usr/local/nginx/logs/$NAME.pid

　　SCRIPTNAME=/etc/init.d/$NAME

　　# Gracefully exit if the package has been removed.

　　test -x $DAEMON || exit 0

　　d_start() {

　　$DAEMON -c $CONFIGFILE || echo -en "/n already running"

　　}

　　d_stop() {

　　kill -QUIT `cat $PIDFILE` || echo -en "/n not running"

　　}

　　d_reload() {

　　kill -HUP `cat $PIDFILE` || echo -en "/n can't reload"

　　}

　　case "$1" in

　　start)

　　echo -n "Starting $DESC: $NAME"

　　d_start

　　echo "."

　　stop)

　　echo -n "Stopping $DESC: $NAME"

　　d_stop

　　echo "."

　　reload)

　　echo -n "Reloading $DESC configuration..."

　　d_reload

　　echo "."

　　restart)

　　echo -n "Restarting $DESC: $NAME"

　　d_stop

　　# One second might not be time enough for a daemon to stop,

　　# if this happens, d_start will fail (and dpkg will break if

　　# the package is being upgraded). Change the timeout if needed

　　# be, or change d_stop to have start-stop-daemon use --retry.

　　# Notice that using --retry slows down the shutdown process

　　# somewhat.

　　sleep 1

　　d_start

　　echo "."

　　echo "Usage: $SCRIPTNAME {start|stop|restart|reload}" >&2

　　exit 3

　　esac

　　exit 0

　　將文件寫入到 /etc/init.d/nginx

　　sudo chmod +x /etc/init.d/nginx

　　測試是否可正確運行

　　sudo /etc/init.d/nginx start

　　設置自動啟動

　　sudo /sbin/chkconfig --level 345 nginx on

　　Posted by devon At March 16, 2008 12:26

　　link_to_remote 取靜態頁面

　　 'post', :method => 'get', :url => '/post_1.html' %>

　　將 url 改為靜態面頁的地址即可。

　　Posted by devon At March 16, 2008 11:07

　　in_place_editor for rails2.0

　　module InPlaceMacrosHelper

　　# Makes an HTML element specified by the DOM ID +field_id+ become an in-place

　　# editor of a property.

　　# A form is automatically created and displayed when the user clicks the element,

　　# something like this:

　　# The form is serialized and sent to the server using an AJAX call, the action on

　　# the server should process the value and return the updated value in the body of

　　# the reponse. The element will automatically be updated with the changed value

　　# (as returned from the server).

　　# Required +options+ are:

　　# :url:: Specifies the url where the updated value should

　　# be sent after the user presses "ok".

　　# Addtional +options+ are:

　　# :rows:: Number of rows (more than 1 will use a TEXTAREA)

　　# :cols:: Number of characters the text input should span (works for both INPUT and TEXTAREA)

　　# :size:: Synonym for :cols when using a single line text input.

　　# :cancel_text:: The text on the cancel link. (default: "cancel")

　　# :save_text:: The text on the save link. (default: "ok")

　　# :loading_text:: The text to display while the data is being loaded from the server (default: "Loading...")

　　# :saving_text:: The text to display when submitting to the server (default: "Saving...")

　　# :external_control:: The id of an external control used to enter edit mode.

　　# :load_text_url:: URL where initial value of editor (content) is retrieved.

　　# :options:: Pass through options to the AJAX call (see prototype's Ajax.Updater)

　　# :with:: JavaScript snippet that should return what is to be sent

　　# in the AJAX call, +form+ is an implicit parameter

　　# :script:: Instructs the in-place editor to evaluate the remote JavaScript response (default: false)

　　# :click_to_edit_text::The text shown during mouseover the editable text (default: "Click to edit")

　　def in_place_editor(field_id, options = {})

　　function = "new Ajax.InPlaceEditor("

　　function

　　js_options = {}

　　if protect_against_forgery?

　　options[:with] ||= "Form.serialize(form)"

　　options[:with] += " + '&authenticity_token=' + encodeURIComponent('#{form_authenticity_token}')"

　　end

　　js_options['cancelText'] = %('#{options[:cancel_text]}') if options[:cancel_text]

　　js_options['okText'] = %('#{options[:save_text]}') if options[:save_text]

　　js_options['loadingText'] = %('#{options[:loading_text]}') if options[:loading_text]

　　js_options['savingText'] = %('#{options[:saving_text]}') if options[:saving_text]

　　js_options['rows'] = options[:rows] if options[:rows]

　　js_options['cols'] = options[:cols] if options[:cols]

　　js_options['size'] = options[:size] if options[:size]

　　js_options['externalControl'] = "'#{options[:external_control]}'" if options[:external_control]

　　js_options['loadTextURL'] = "'#{url_for(options[:load_text_url])}'" if options[:load_text_url]

　　js_options['ajaxOptions'] = options[:options] if options[:options]

　　# js_options['evalScripts'] = options[:script] if options[:script]

　　js_options['htmlResponse'] = !options[:script] if options[:script]

　　js_options['callback'] = "function(form) { return #{options[:with]} }" if options[:with]

　　js_options['clickToEditText'] = %('#{options[:click_to_edit_text]}') if options[:click_to_edit_text]

　　js_options['textBetweenControls'] = %('#{options[:text_between_controls]}') if options[:text_between_controls]

　　function

　　javascript_tag(function)

　　end

　　# Renders the value of the specified object and method with in-place editing capabilities.

　　def in_place_editor_field(object, method, tag_options = {}, in_place_editor_options = {})

　　tag = ::ActionView::Helpers::InstanceTag.new(object, method, self)

　　tag_options = {:tag => "span", :id => "#{object}_#{method}_#{tag.object.id}_in_place_editor", :class => "in_place_editor_field"}.merge!(tag_options)

　　in_place_editor_options[:url] = in_place_editor_options[:url] || url_for({ :action => "set_#{object}_#{method}", :id => tag.object.id })

　　tag.to_content_tag(tag_options.delete(:tag), tag_options) +

　　in_place_editor(tag_options[:id], in_place_editor_options)

　　end

　　解決在rails2.0以上版本使用in_place_editor時出現的 ActionController::InvalidAuthenticityToken 錯誤。

　　Posted by devon At March 15, 2008 16:20

　　capture in view

　　Welcome to my shiny new web page! The date and time is

　　The capture method allows you to extract part of a template into a variable. You can then use this variable anywhere in your templates or layout.

　　Posted by devon At March 13, 2008 14:06

　　在 before_filter 中使用不同的layout

　　before_filter Proc.new {|controller| layout 'iframe' unless controller.request.env["HTTP_REFERER"] =~ /localhost/ }

　　如果不是從localhost這個站點來訪問的，則使用 iframe 的 layout

　　Posted by devon At March 11, 2008 17:38

　　Rails中獲取 HTTP_REFERER

　　request.env["HTTP_REFERER"]

　　可以取到的參數包括：

　　SERVER_NAME: localhost

　　PATH_INFO: /forum/forums

　　HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/522.11 (KHTML, like Gecko) Version/3.0.2 Safari/522.12

　　HTTP_ACCEPT_ENCODING: gzip, deflate

　　SCRIPT_NAME: /

　　SERVER_PROTOCOL: HTTP/1.1

　　HTTP_HOST: localhost:3000

　　HTTP_CACHE_CONTROL: max-age=0

　　HTTP_ACCEPT_LANGUAGE: en

　　REMOTE_ADDR: 127.0.0.1

　　SERVER_SOFTWARE: Mongrel 1.1.3

　　REQUEST_PATH: /forum/forums

　　HTTP_REFERER: http://localhost:3000/

　　HTTP_COOKIE: _matchsession=BAh7BzoMY3NyZl9pZCIlNWJiNzg4NDUzOWQzNWFhZTQ4MGRkNTUwYzc0MDc5%250AZGYiCmZsYXNoSUM6J0FjdGlvbkNvbnRyb2xsZXI6OkZsYXNoOjpGbGFzaEhh%250Ac2h7AAY6CkB1c2VkewA%253D268e6091590591d959128f3b17b62ff46244a0a3; _slemail=temp%40email.com; _slhash=9dfd86431742273e3e96e06a1c20541d69f74dc9; _haha_session=BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo%250ASGFzaHsABjoKQHVzZWR7AA%253D%253D--96565e41694dc839bd244af40b5d5121a923c8e3

　　HTTP_VERSION: HTTP/1.1

　　REQUEST_URI: /forum/forums

　　SERVER_PORT: "3000"

　　GATEWAY_INTERFACE: CGI/1.2

　　HTTP_ACCEPT: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5

　　HTTP_CONNECTION: keep-alive

　　REQUEST_METHOD: GET

　　以上就是ruby on rails代碼參數詳解，想必都了解了吧，更多相關內容請繼續關注武林技術頻道。

上一篇：CentOS中配置Ruby on Rails的詳細教程

下一篇：rails連接mysql出現異常的處理方法