Dev-Feeds

<%= '&nbsp;' * 5 %>

Outputs:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

numeric_var  =~ /^[-+]?[0-9]*\.?[0-9]+$/

To get the current time:
time = Time.now

To get the current year:
year =  Time.now.Year

Search past 3 months records: 
Event.find(:all, :conditions => ["created_at > ? ",Time.now - 3.month])

Activate Menu-> Ctrl+Shift+F10
Add Bookmark -> Ctrl_Shift+B
Clear Scrollbak and Reset -> Ctrl+Shift+X
Close Active Tab -> Ctrl+Shift+S
Close Other Tabs -> Ctrl+Shift+O
Close Current Tab -> Ctrl+Shift+W
Copy -> Ctrl+Shift+C
Detach Current Tab -> Ctrl+Shift+H
Enlarge Font -> Ctrl++
Expand View -> Ctrl+Shift+]
Find Next Search-> F3
Find Previous Search -> Shift+F3
Find -> Ctrl+Shift+F
Monitor for Activity -> Cttl+Shift+A
Monitor for Silence -> Ctrl+Shift+I
Move to Left Tab -> Ctrl+Shift+Left
Move to Right Tab -> Ctrl+Shift+Right
Open New Tab -> Ctrl+Shift+T
Open New Window -> Ctrl+Shift+N
Move to Next Tab -> Shift+Right
Next View Container -> Shift+Tab
None -> Ctrl+Shift+/
Paste -> Ctrl+Shift+V or Shift+Ins
Paste Selection -> Ctrl+Shift+Ins
Previous TAb -> Shift+Left
Quit -> Ctrl+Shift+Q
Rename Tab -> Ctrl+Alt+S

This will create an array with the 10 empty elements.

>> Array.new(10, '')
Output
=> ["", "", "", "", "", "", "", "", "", ""]

To run the single migration in the db.

rake db:migrate       # Runs the full db migration
rake db:migrate VERSION=x #Runs the particular version

PostgreSQL: Reset the sequence value of the table

Result

  setval
--------
   1706
(1 row)

===============================

Example2(Recommanded)

Result

  setval
--------
   1706
(1 row)

 

===============================

PostgreSQL: Get the next sequence value of the table

select nextval('students_id_seq');

Result

 nextval
---------
    1707
(1 row)

  dERs = Student.find(:all,:select => "id", :conditions => "")
  dER_ids = dERs.map(&:id)

This updates all records that mathcing with the given conditions

 People.update_all( "name = 'Joe'", "name ilike '%joe%'" )

cookies[:login] = { :value => "asdf", :expires => Time.now + 600} 

The above cookie will :expires in 10 min .

To Delete the Cookie in Ruby on rails:

cookies.delete :login 

To Delete Cookie in Javascript:

createCookie(":login","",-1); 

Create new controller in ruby on rails is the easy thing. Just follow the following process

[root]# script/generate controller <controller-name>

Sample
script/generate controller registration

this will genereate the following folders/files.

      exists  app/controllers/
      exists  app/helpers/
      create  app/views/registration
      exists  test/functional/
      create  app/controllers/registration_controller.rb
      create  test/functional/registration_controller_test.rb
      create  app/helpers/registration_helper.rb