Ruby on rails code skills

Git repository output
Git archive -- format = tar -- prefix = actasfavor/HEAD | (cd/home/holin/work/& tar xf -)
Output to the/home/holin/work/actasfavor/directory

Posted by holin At May 16,200 8
Load controller and model in plugins

# 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 15,200 8
The first five most frequently used commands
History | awk {'print $ 2'} | sort | uniq-c | sort-k1-rn | head-n5

Posted by holin At May 15,200
Sort by an attribute of an array element
@ Users. sort! {| A, B | a. last <=> B. last}

Posted by holin At May 11,200 8
Back up databases by date
Mysqldump db_name-uroot> "/root/db_backup/kaoshi_web _ 'date +" % Y-% m-% d "'. SQL"

Posted by holin At May 08,200 8
Use memcached to manually cache data

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 30 min
End
Memcache-client 1.5.0:
Get (key, expiry = 0)
Put (key, value, expiry = 0)

Posted by devon At May 04,200 8
Shuffle an array

Class Array
Def shuffle
Sort_by {rand}
End
Def shuffle!
Self. replace shuffle
End
End

Posted by holin At May 04,200 8
Make all ajax requests not render: layout

Def render (* args)
Args. first [: layout] = false if request. xhr? And args. first [: layout]. nil?
Super
End

Posted by devon At May 03,200 8
Find with Hash

Event. find (
: All,
: Conditions => ["title like: search or description like: search ",
{: Search => "% Tiki %"}]
)

Posted by devon At May 03,200 8
Execute the SQL statement script

Mysql-uroot-p123 <END
Use dbame;
Delete from results;
Delete from examings;
Quit
END

Posted by holin At May 01,200 8
SQL Transaction in Rails

Def fetch_value
SQL = ActiveRecord: Base. connection ();
SQL .exe cute "SET autocommit = 0 ";
SQL. begin_db_transaction
Id, value =
SQL .exe cute ("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 limit l 30,200 8
Display the dynamic effect of Flash messages

<% If flash [: warning] or flash [: notice] %>
<Div id = "notice" <% if flash [: warning] %> class = "warning" <% end %>
<% = Flash [: warning] | flash [: notice] %>
</Div>
<Script type = "text/javascript">
SetTimeout ("new Effect. Fade ('notice ');", 15000)
</Script>
<% End %>
Automatic notice Div disappears after 15000 milliseconds.

Posted by devon At least l 29,200 8
Delete constants in the environment

Object. send (: remove_const,:)
> Math
=> Math
> Object. send (: remove_const,: Math)
=> Math
> Math
NameError: uninitialized constant Math

Posted by devon At least l 28,200 8
Manually add authenticity_token
<Div style = "margin: 0; padding: 0 "> <input name =" authenticity_token "type =" hidden "value =" <% = form_authenticity_token %> "/> </div>

Posted by devon At least l 28,200 8
Rails group_by

<% @ Articles. group_by (&: day). each do | day, articles | %>
<Div id = 'day' style = "padding: 10px 0;">
<H2> <% = day. to_date.strftime ('% y % m % dday') %> <% = Render: partial => 'Article',: collection => articles %>
</Div>
<% End %>
Articles are grouped by days

Posted by devon At least l 25,200 8
Read/write files

# 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
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 limit l 17,200 8
Traverse directories
Dir. glob (File. join ('app/controllers', "**", "* _ controller. rb") {| filename | puts filename}

Posted by holin At limit l 16,200 8
String to model
1
2
> 'Tag _ course'. camw.e. constantize. find (: first)
==## <TagCourse id: 7, tag_id: 83, course_id: 2>
* Camelize (lower_case_and_underscored_word, first_letter_in_uppercase = true )*
By default, camw.e converts strings to UpperCamelCase. If the argument to cam%e is set to ": lower" then cam%e 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 least l 07,200 8
Call Proc
1
2
3
A = Proc. new {| I | puts I}
A ['hahaha']
A. call ('hehes ')

Posted by holin At March 28,200 8
Host static files in Rails
1
2
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 guest SS assets-0.example.com, assets-1.example.com, assets-2.example.com, and assets-3.example.com.

Posted by devon At March 26,200 8
Package gems to the project directory

$ Mkdir vendor/gems
$ Cd vendor/gems
$ Gem unpack hpricot
Unpacked gem: 'hpricot-8080'
Config. load_paths + = Dir ["# {RAILS_ROOT}/vendor/gems/**"]. map do | dir |
File. directory? (Lib = "# {dir}/lib ")? Lib: dir
End

Posted by devon At March 26,200 8
Execute the code in the file in the current context

Instance_eval(File.read('param.txt '))
# Such
@ Father = 'father'
Instance_eval ("puts @ father ")
# Produces:
# Father

Posted by holin At March 20,200 8
Add the directory of the current file to the require path

$ LOAD_PATH <File. expand_path (File. dirname (_ FILE __))
# Or
$: <File. expand_path (File. dirname (_ FILE __))
# This one puts current path before the other path.
$:. Unshift (File. expand_path (File. dirname (_ FILE __)))
* _ FILE _ * current FILE path

Posted by holin At March 19,200 8
Multi-field fuzzy search

Conditions = []
[: Name,: school,: province,: city]. each {| attr | conditions <Profile. send (: sanitize_ SQL, ["# {attr} LIKE? "," % # {Params [: q]} % "]) if params [: q]}
Conditions = conditions. any? ? Conditions. collect {| c | "(# {c})"}. join ('OR'): nil
In the profile table, perform fuzzy search by name, school, province, and city.

Posted by devon At March 17,200 8
Nginx Startup Script


#! /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
Write the file to/etc/init. d/nginx
Sudo chmod + x/etc/init. d/nginx
Test availability
Sudo/etc/init. d/nginx start
Set automatic start
Sudo/sbin/chkconfig -- level 345 nginx on

Posted by devon At March 16,200 8
Link_to_remote Static Page
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<% = Link_to_remote "update post",: update => 'post',: method => 'get',: url => '/post_1.html' %>
<Div id = 'post'> </div>
Change the url to the address of the Static Page.

Posted by devon At March 16,200 8
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:
# <Form id = "myElement-in-place-edit-form" target = "specified url">
# <Input name = "value" text = "The content of myElement"/>
# <Input type = "submit" value = "OK"/>
# <A onclick = "javascript to cancel the editing"> cancel </a>
# </Form>
#
# The form is serialized and sent to the server using an AJAX call, the action on
# The server shocould process the value and return the updated value in the body
# The reponse. The element will automatically be updated with the changed value
# (As returned from the server ).
#
# Required + options + are:
# <Tt>: url </tt>: Specifies the url where the updated value shoshould
# Be sent after the user presses "OK ".
#
# Addtional + options + are:
# <Tt>: rows </tt>: Number of rows (more than 1 will use a TEXTAREA)
# <Tt>: cols </tt>: Number of characters the text input shoshould span (works for both INPUT and TEXTAREA)
# <Tt>: size </tt>: Synonym for: cols when using a single line text input.
# <Tt>: cancel_text </tt>: The text on the cancel link. (default: "cancel ")
# <Tt>: save_text </tt>: The text on the save link. (default: "OK ")
# <Tt>: loading_text </tt>: The text to display while the data is being loaded from the server (default: "Loading ...")
# <Tt>: saving_text </tt>: The text to display when submitting to the server (default: "Saving ...")
# <Tt>: external_control </tt>: The id of an external control used to enter edit mode.
# <Tt>: load_text_url </tt>: URL where initial value of editor (content) is retrieved.
# <Tt>: options </tt>: Pass through options to the AJAX call (see prototype's Ajax. Updater)
# <Tt>: with </tt>: JavaScript snippet that shoshould return what is to be sent
# In the AJAX call, + form + is an implicit parameter
# <Tt>: script </tt>: Instructs the in-place editor to evaluate the remote JavaScript response (default: false)
# <Tt>: click_to_edit_text </tt>: The text shown during mouseover the editable text (default: "Click to edit ")
Def in_place_editor (field_id, options = {})
Function = "new Ajax. InPlaceEditor ("
Function <"'# {field_id }',"
Function <"'# {url_for (options [: url])}'"
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 <(',' + options_for_javascript (js_options) unless js_options.empty?
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
End
Solve the ActionController: InvalidAuthenticityToken error when in_place_editor is used in rails2.0 or later versions.

Posted by devon At March 15,200 8
Capture in view

<% @ Greeting = capture do %>
Welcome to my shiny new web page! The date and time is
<% = Time. now %>
<% End %>
<Html>
<Head> <title> <% = @ greeting %> </title> <Body>
<B> <% = @ greeting %> </B>
</Body> 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 13,200 8
Use different layout in before_filter
Before_filter Proc. new {| controller | layout 'iframe' unless controller. request. env ["HTTP_REFERER"] = ~ /Localhost /}
If it is not accessed from the localhost site, use layout of iframe

Posted by devon At March 11,200 8
Get HTTP_REFERER in Rails
Request. env ["HTTP_REFERER"]
The following parameters can be obtained:
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 = %%%%%%%%%%;_ slemail = temp % 40email.com; _ slhash = %;_ haha_session = %%%250asgfzahsabjokqhvzzwr7aa % 253D % 253D -- reset
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