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 [Ruby on Rails]Rails代码片段
软件技术
lhwork 发表于 2007/1/19 15:57:25 |
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1Debugging Views in Development
ruby 代码
<!--javascript_include_tag 'prototype'-->
<!--/span><span class="keyword">if</span><span> ENV['RAILS_ENV'] == 'development'-->
"debug" style="margin: 40px 5px 5px 5px;">
"#" onclick="Element.toggle('debug_info');return false" style="text-decoration: none; color: #ccc;">Show Debug Info ➲
"debug_info" style="display : none;">
<!--debug session-->
<!--debug params-->
还有一个相关的插件：TextmateFootnotesPlugin
ruby 代码
class << Dispatcher
def dispatch(cgi = CGI.new,
session_options = ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS)
begin
request, response =
ActionController::CgiRequest.new(cgi, session_options),
ActionController::CgiResponse.new(cgi)
prepare_application
ActionController::Routing::Routes.recognize!(request).process(request, response).out
rescue Object => exception
begin
ActionController::Base.process_with_exception(request, response, exception).out
rescue
# The rescue action above failed also, probably for the same reason
# the original action failed. Do something simple which is unlikely
# to fail. You might want to redirect to a static page instead of this.
e = exception
cgi.header("type" => "text/html")
cgi.out('cookie' => '') do
<<-RESPONSE
Application Error
#{e.class}: #{e.message}
#{e.backtrace.join("\n")}
RESPONSE
end
end
ensure
reset_application
end
end
end
3 SQL Logging in Rails
ruby 代码
SQL_LOGGING = true
SQL_LOG_MAX_LINES = 5000
SQL_LOG_FILE = File::join(RAILS_ROOT, '/log/sql_log.txt')
# $sql_log is a global var that will hold the results of the last sql statement executed
$sql_log = ""
# permit logging if we are in development environment
if RAILS_ENV_DEV || RAILS_ENV_TEST
connection = ActiveRecord::Base.connection
class << connection
alias :original_exec :execute
def execute(sql, *name)
# try to log sql command but ignore any errors that occur in this block
# we log before executing, in case the execution raises an error
begin
if SQL_LOGGING
if File::exists?(SQL_LOG_FILE) : lines = IO::readlines(SQL_LOG_FILE)
else lines = Array.new(); end
log = File.new(SQL_LOG_FILE, "w+")
# keep the log to specified max lines
if lines.length > SQL_LOG_MAX_LINES
lines.slice!(0..(lines.length-SQL_LOG_MAX_LINES))
end
lines << Time.now.strftime("%x %I:%M:%S %p")+": "+sql+"n"
log.write(lines)
log.close
$sql_log = sql
end # if
rescue Exception => e
;
end
# execute original statement
original_exec(sql, *name)
end # def execute
end # class <<
end # if RAILS_ENV_DEV
Here's the constant setting code (put in application.rb or something it requires before the code above gets run):
class CoreERR_RailsEnvironment < StandardError; end
#RAILS specific constants
#setup global constants for manipulating states
RAILS_ENV_VAR = "RAILS_ENV"
#set ENV to development if explicit or not present
RAILS_ENV_DEV = (ENV[RAILS_ENV_VAR]=="development" || (not ENV[RAILS_ENV_VAR]))
RAILS_ENV_LIVETEST = ENV[RAILS_ENV_VAR]=="livetest"
RAILS_ENV_TEST = ENV[RAILS_ENV_VAR]=="test"
if (RAILS_ENV_DEV) or (RAILS_ENV_TEST)
RAILS_ENV_PRODUCTION = false
else
RAILS_ENV_PRODUCTION = true
end
# check positively: if production environment is implied because test and development are not found
# but production doesn't show up positively, raise exception
if RAILS_ENV_PRODUCTION and (RAILS_ENV_PRODUCTION != (ENV[RAILS_ENV_VAR]=="production"))
raise CoreERR_RailsEnvironment, "Production environment implied but not detected: "+ENV[RAILS_ENV_VAR]
end
RAILS_DB_SU = ENV[RAILS_ENV_VAR]+'_su'
RAILS_ENV_DEV.freeze
RAILS_ENV_TEST.freeze
RAILS_ENV_PRODUCTION.freeze
3 Digest MD5 & SHA1
Digest 支援 MD5 和 SHA1 兩種編碼, 你若有儲存密碼的需求就要用到, 一般是用 SHA1.
MD5 計算
require 'digest/md5'
puts Digest::MD5.hexdigest("Hello World!")
計算檔案的 MD5, 可以確保檔案未曾被修改
require 'digest/md5'
#method 1
puts Digest::MD5.hexdigest(File.read("o.rb"))
#method 2
class Digest::MD5
def self.open(path)
o = new
File.open(path) { |f|
buf = ""
while f.read(256, buf)
o << buf
end
}
o
end
end
puts Digest::MD5.open("o.rb").hexdigest
SHA1 計算
require 'digest/sha1'
puts Digest::SHA1.hexdigest("Hello World!")
最后更新：2007-01-11 20:23 |
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