Technical

irbrc

Wed, 03 Dec 2008 16:05:08 Z

I’ve started moving towards “rsheling” so following can be inputed into ~/.irbrc on nix based systems or read for windows in order to automate some tasks in ./script/console

Get attributes ( fields ) of the Model


def attributes_for(class_name)
   puts class_name.find_first.attributes.keys.sort
end

#Or you could simply do
Person.column_names # Found much later then the attributes_for

#returns all the attributes of the model

Get Help


def ri(*name)
  system(%{ri #{name.map{|name| name.to_s}.join(" ")}})
end

Get Stats ( sweet stats :))


def rake_stats
  system( %{rake stats} )
end

Get methods of the class, object or whatever else you’re inspecting without object’s instance methods ( Thanks to Geoff and Jacob Harris)


# >> "a".self_methods
# => ["%", "*", "+",...]
class Object
  def self_methods
    (self.methods - Object.instance_methods).sort
  end
end
# >> "a".methods.length
# => 216
# >> "a".self_methods.length
# => 141

Run ruby commands or files from console

This one would still need some love since its taking params as a string
if you know a way of changing it please feel free to update.


def run(*name)
  system(%{ ruby #{name} })
end
# Run single integration file
>> run "test/integration/authentication_test.rb" 
Loaded suite test/integration/authentication_test.rb
Started
.........
Finished in 4.805332 seconds.

9 tests, 57 assertions, 0 failures, 0 errors
=> true
# Get ruby version
>> run "-v" 
ruby 1.8.4 (2005-12-24) [i686-linux]
=> true

Run functional or unit tests from console

I am using autotest, nevertheless I found that sometimes it good to run tests individually. Following will let you to brows through all your test files based on your choice(:functional,:unit)

Its much more convenient and batter to run rake tests, but some times you just wanted to run each test individually, also its very unfortunate that its a luxury to have a separate test environment.


def test(*type)
  if ENV['RAILS_ENV']  'test'
   Dir.entries("test/#{type.to_s}").each do |file|
     run "test/#{type.to_s}/#{file}" if file.last(3)  ”.rb” 
   end
  else
  puts “You dont want to run your tests in environment other then ‘test’” 
  end
end
#Not that im sending symbol
test :functional
#Loaded suite test/functional/parent_contact_controller_test
#Started
#.............
#Finished in 2.839345 seconds.
test :unit
#Loaded suite test/unit/legal_entity_exception_test
#Started
#.
#Finished in 0.339246 seconds.

How To inspect helpers from console

Originally I found it on err.the_blog written by PJ Hyett and Chris Wanstrath. – Thank You Im posting it here in case if it will be deleted from original place

in case of any concerns from people mentioned above I promise to remove this peace.


def Object.method_added(method)
  return super(method) unless method == :helper
  (class<<self;self;end).send(:remove_method, :method_added)

  def helper(*helper_names)
    returning $helper_proxy ||= Object.new do |helper|
      helper_names.each { |h| helper.extend "#{h}_helper".classify.constantize }
    end
  end

  helper.instance_variable_set("@controller", ActionController::Integration::Session.new)

  def helper.method_missing(method, *args, &block)
    @controller.send(method, *args, &block) if @controller && method.to_s =~ /_path$|_url$/
  end

  helper :application rescue nil
end if ENV['RAILS_ENV']

or download from http://pastie.caboo.se/27125/text

Geoff’s Contribution(s):


# an irb clear
def clear
  STDOUT.write("#{0x1b.chr}[0;0H")
  STDOUT.write("#{0x1b.chr}[2J")
end
# or ctrl+l (lower l on *nix)
# ctrl+k on mac

# Method searching
#   >> [1,2,3].method_search("sort")
#   => ["sort", "sort!", "sort_by"]
class Object
  def method_search(string)
    self.methods.find_all{ |i| i.match(/#{string}/) }.sort
  end
end

# Tab-completion of methods as seen here: http://showmedo.com/videos/video?name=rubyLakeIrbCompletion
require 'irb/completion'

Auto-tabbing turned on : as found on http://drnicwilliams.com/category/ruby/gems/


#Add in ~/.irbrc
IRB.conf[:AUTO_INDENT]=true

So now if you write itereator, method or anything that would require indent, you would see


>> [1,2].each do |n|
?>     puts n
>>   end
1
2
=> [1, 2]

Some “svnning”


#>> svn :up
#At revision 626.
#=> true
def svn(*action)
  system %(/home/tpdev/bin/linux/svn  #{action})
end

Historify your session by Mike Clark


HISTFILE = "~/.irb.hist" unless defined? HISTFILE
MAXHISTSIZE = 100 unless defined? MAXHISTSIZE

begin
  if defined? Readline::HISTORY
    histfile = File::expand_path(HISTFILE)
    if File::exists?(histfile)
      lines = IO::readlines(histfile).collect { |line| line.chomp }
      Readline::HISTORY.push(*lines)
    end

    Kernel::at_exit {
      lines = Readline::HISTORY.to_a.reverse.uniq.reverse
      lines = lines[-MAXHISTSIZE, MAXHISTSIZE] if lines.nitems > MAXHISTSIZE
      File::open(histfile, File::WRONLY|File::CREAT|File::TRUNC) {|f|
        lines.each {|line| f.puts line }
      }
    }
  end
end

Home Page

Wed, 03 Dec 2008 16:04:32 Z

Testing

UI (a.k.a User Interface)

→ Master User Interface From Rails Studio Users
→ Charts Suitable For Rails

YAML

→ DumpStructureToYAML

VIM

→ Commands
→ ClearWindowsLittering

Web Trickery

→ Cascading Style Sheets

EMACS

→ Rails Ready Emacs For Ubuntu

Where In Files…?

→ Rake Tasks
→ Sybase Ini

Subversion

→ Howto Start New Project With Taging And Branching
→ Howto Create Patches Using Svn
→ Svn Instalation Errors
→ Howto Make Subversion Trac Friendly
→ Svn Stat Greping
→ Howto Merge Dev Branch With Trunk

Ziping Unziping And Maybe Gziping

Wed, 26 Nov 2008 20:22:04 Z

To tar file


tar -cvf file_name.tar file_name

To untar file


tar -xvf file_name.tar

To tar and gzip


tar -pczf file_name.tar.gz file_name

To untar gziped file


tar -zxvf file_name.tar.gz

To just gzip


gzip file_name

To just ungzip


ungzip file_name.gz

Bonus

How to tar and gzip multiple files using irb. In the following case I have bunch of files which are timestamped and spread by year accordingly.


(2000..2006).each{|year| `tar -pczf #{year}.tar.gz #{year}`}

to view process use -v switch

Config Options

Fri, 21 Nov 2008 18:04:05 Z

Sessions


ActionController::Base.session_options[:tmpdir] = '/tmp'
ActionController::Base.session_options[:prefix] = 'dbx_margin.'

Logs


config.log_path = "/tmp/dbx_margin_#{ENV['RAILS_ENV']}.log"

LogRotate

To set log rotate options in config:


 config.logger = Logger.new("#{RAILS_ROOT}/log/#{RAILS_ENV}.log", 5, 104857)

This will span logs in to 5 files and recycle them in 10mb span.

Custom Logger

Some times I just want to be able to output my data to a seperate log file so I could get dipper analysis of data to do that I can do:


l = Logger.new(RAILS_ROOT + "/log/custom_log_file.log")
l.debug("test")

Corporate Evolution

Thu, 06 Nov 2008 19:53:35 Z

How to make the best out of it.
So I went from Corporate Messaging

TO

Corporate Messaging

Thu, 06 Nov 2008 19:53:19 Z

THE most AGILE practices

Agility of this method is that you know about user requirements even before you turn on your computer. I should migrate/upgrade them to the Index Cards, would look more standard.

Follow up to this story

Continuously Monitor Process With Ps And Grep

Thu, 06 Nov 2008 19:47:58 Z

Hello ? Are you there ?

Sometimes you want to see whats happning with your script on the backgound, especially when the script is not very talkative.


while true; do  ps ax | grep store_nyiso; sleep 2; done

where store_nyiso is the part of the script name that is present in my file.

Shelling Commands Tricks And Many More

Thu, 06 Nov 2008 19:35:46 Z

To remove all of the files/folders based on given params


  rm -rf `find . -name '*.html'`

Continuously monitor process


while true; do  ps ax | grep store_nyiso; sleep 2; done

String Manipulations Using Sql

Wed, 29 Oct 2008 20:11:36 Z

gsub Using sql

I had a case where the string was not supposed to show a suffix. String looked like “GOWANUS-ZK-1” and I had to loose ”-1” part. Of course right away I flexed my regex muscles and in the end got the following:


(generator.longname =~ /-1/ ? generator.longname.gsub('-1','') : generator.longname)

cryptic isnt it?

This is how this can be replaced with sql or select statment using rails.


 Generator.find(:all,:select => "REPLACE(longname,'-1','') as longname")

More on the REPLACE function can be found here

Rspeced Mocks

Mon, 27 Oct 2008 23:09:06 Z

Simple mock

Following is a quick example that mocks Net::LDAP library. The use of this example is in showing how to mock methods that receive values or being assigned values as an instance variables of the class. For the mock library it will be the same thing since it does not know nor needs to care about object.


   ldap = Net::LDAP.should_receive(:new).and_return(
      mock("ldap",
           :host= => "test.local",
           :bind_as => @ldap_result)
    )

So in this example host is an instance variable there fore you will see that we set it using :host= whereas the bind_as is a method that returns the ldap results. NOTE: key represents method name and value represents what it returns.Also, you have to use symbol for the key (:host=) if you will stringified key(“host=”) it will not work.

Hover For Table Using Css

Mon, 27 Oct 2008 21:46:25 Z

For more descriptive solution navigate to here
In simple your hover css code looks as following:


table.custom tbody#custom-tbody tr:hover td{
      background-color: #632a2a;
      color: #fff;
}

Cascading Style Sheets

Mon, 27 Oct 2008 21:44:11 Z

I know, I know… Another 480 + milion’s resource that talks about CSS. Well, I had some css that was repeating and was failing since I was forgeting how to get it going so I decided to start recording css as well.

Here it goes:

Hover For Table Using Css

Useful Regex Examples

Thu, 16 Oct 2008 20:32:08 Z

How to parse -h or—help from script input


ARGV[0] =~ /-\?|-h|--help/

How to check if you have Am Or Pm


>> m =  /([0-9]+) +([AP]M)/.match("12 AM")
=> #<MatchData:0xb743cb34>
>> puts " match 1: #{m[0]} match 2: #{m[1]} match 3: #{m[2]}" 
=> match 1: 12 AM match 2: 12 match 3: AM

How To Get exect match for the string

To get exact match you would need to use ^ (which means begining of the string) and $ (which means end of the string) charecters with the string in question in the middle.



"NARROWS"  =~ /(^NARROWS$|^GOWANUS$)/

How to match and retrive values that received the match.

Let say I have the following string "CCF08-987*" and I want to break it in a following manner [CCF][08]-[987][*] Following is a regular expression to do that:


"CCF08-987*" =~ /([a-zA-Z]+)(\d[0-9])-(\d[0-9]*)(\*)/

And following is the way of how to retrieve the matching values:


>> $1
=> "CCF" 
>> $2
=> "08" 
>> $3
=> "987" 
>> $4
=> "*"

Playing around with literals in Regexp

Its very often that you have to parse out the ‘star’ (*) charecter when receiving user’s search input. In my case based on whether star in the begining or end of the string I would have to do either more(>) or less(<)
sign. Following patterns should help u get the matches.

This expresion checks whether star(*) is present in your string


>> "123*" =~ /(\*)/
=> 3 #this is a place at which match was found (starting with 0)

This expression checks if star is at the end of the string


>> "123*" =~ /(\*)$/
=> 3

This expression checks if star is at the begining of the string


>> "*123" =~ /^(\*)/
=> 0
>> $1
=> "*" 
>> $'

RJS

Tue, 07 Oct 2008 21:32:52 Z

To disable Element using RJS


#html
<input id="Sec2Override_nvalue" name="Sec2Override[nvalue]" size="30" type="text" />
#RJS
render :update  do |page|
   page["Sec2Override_nvalue"].disabled = true
end 
#or 
render :update do |page|
  page.element.disable('element_name')
end

To disable form on load or complete


<%= form_tag {:action => ""},{:id => "search_form"} %>
<%= text_field_with_auto_complete :search,
                                  :q,
                                  {
                      :loading =>'Form.disable("search_form")',
                      :complete => 'Form.enable("search_form")'
                      }
<%= end_form_tag %>

To redirect when call was made by form_remote_tag


render :update do |page|
  page.redirect_to :controller => "legal_entity" 
end

form_remote_tag with disable on loading and enable on complete
This should be refactored IMHO, because it can get very harry.


  <%= form_remote_tag(:url => {:action => "search_borrow_list"},
                                :loading => 'Form.disable("search_form")',
                                :complete => 'Form.enable("search_form")',
                          :html => {
                                :id => "search_form",
                                :style => "margin:0px 0px 0px 0px" 
                              }
                         ) %>

link_to_remote – with id and other html parameters

Yes, it confuses me every time I need to use it out of ordinary, and unfortunately Rail’s Docs are really skimpy on this one.


     <%= link_to_remote("&darr;",
         {
          :url => {   
            :action => "show_ordered_averages",
            :order => "bg_location_id",
            :lmp_type_select => params[:lmp_type_select]
          }, #=> url params
          :with => "'bg_location_id_sort_dir='+$('bg_location_id_sort_dir').value",
          :loading => "Element.show('average-title-indicator')",
          :complete => "Element.hide('average-title-indicator')" 
        },
          {:id => "bg_location_id_link"} #=> html params go here
        ) %>

Inserting raw ajax in to the page object


 page << "$('start_stop_flag_div').style.color='red'"

In this particular case I change the color of the text in the start_stop_flag_div to red

How to call custom javascript function from your RJS code

Some times you would want to call js function from your RJS code using your page object ( or however else you called it ). You can do it the following way:


  page.call "play_sound","alert"

Where play_sound is js function and alert is one of the parameters.
For more on the RJS and many other stuff follow this

Rspec Related

Mon, 06 Oct 2008 17:41:12 Z

Articles related to RSpec

Howto Call Rjs Action Using Rspec
Rspeced Mocks

Technical

irbrc

Get attributes ( fields ) of the Model

Get Help

Get Stats ( sweet stats :))

Get methods of the class, object or whatever else you’re inspecting without object’s instance methods ( Thanks to Geoff and Jacob Harris)

Run ruby commands or files from console

Run functional or unit tests from console

How To inspect helpers from console

Geoff’s Contribution(s):

Auto-tabbing turned on : as found on http://drnicwilliams.com/category/ruby/gems/

Some “svnning”

Historify your session by Mike Clark

Home Page

Action Controller

Action View

Active Record

Active Support

Environment Options

IRB

Just Useful

JRuby

Misc

Mysql

Procedures

Plugins

Random On Rails

RJS

Regular Expressions

Rake

Security

Quick Stubs || Dependency Injections

SHELLing

Scripts

Testing

UI (a.k.a User Interface)

YAML

VIM

Web Trickery

EMACS

Where In Files…?

Subversion

Capistrano

Mechanize

Ziping Unziping And Maybe Gziping

To tar file

To untar file

To tar and gzip

To untar gziped file

To just gzip

To just ungzip

Bonus

Config Options

Sessions

Logs

LogRotate

Custom Logger

Corporate Evolution

How to make the best out of it.So I went from Corporate Messaging

TO

Corporate Messaging

Continuously Monitor Process With Ps And Grep

Hello ? Are you there ?

Shelling Commands Tricks And Many More

To remove all of the files/folders based on given params

Continuously monitor process

String Manipulations Using Sql

gsub Using sql

Rspeced Mocks

Simple mock

Hover For Table Using Css

Cascading Style Sheets

Useful Regex Examples

How to parse -h or—help from script input

How to check if you have Am Or Pm

How To Get exect match for the string

How to match and retrive values that received the match.

Playing around with literals in Regexp

RJS

link_to_remote – with id and other html parameters

How to make the best out of it.
So I went from Corporate Messaging