Protected: Ruby on Rails 3.1.x application Deployment on Heroku

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Mysql::Error: query: not connected while rake db:migrate

With Ruby 1.9.2 and Rails 3.0.10,
If you are facing following problem while doing “rake db:migrate”,

Mysql::Error: query: not connected: SHOW TABLES

then you may need to download ‘libmySQL’ from http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/libmySQL.dll and paste that in C:\Ruby192\bin folder.

HTTP authentication for Ruby on Rails application

You may want to add HTTP authentication to your Ruby on Rails site, add following to your application controller file,


before_filter :authenticate

protected

def authenticate
authenticate_or_request_with_http_basic do |username, password|
username == "test" && password == "test"
end
end


After adding these lines, application will ask for username and password.

Protected: Ruby on Rails 3.0.x application Deployment on Heroku

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select with :onchange in Ruby on Rails

In Ruby on Rails, We can use ‘select’ with nchange as following code block,

= f.select :my_attribute, @my_values.collect{|a| [a.name, a.id]}, {}, { nChange => 'remote_function(blabla....)' }