Suppose you want to remove a 'comments' table from a blog application. You can do so by performing the following tasks from the command line (e.g., Terminal). Step one: $ rails console Step two: $ ActiveRecord::Migration.drop_table(:c...

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Delete table

Answer 1 In Ruby, nil in an object (a single instance of the class NilClass) so methods can be called on it. nil? is a standard method in Ruby that can be called on all objects and returns true for the nil object and false for anything else. emp...

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Difference between .nil?, .blank? and .empty in Ruby?

The map method takes an enumerable object and a block, and runs the block for each element, outputting each returned value from the block (the original object is unchanged unless you use map!): [1, 2, 3].map { |n| n * n } #=> [1, 4, 9] Array ...

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What does the "map" method do in Ruby? How is it dif...

Download Ruby and install Check ruby installation: ruby -e "puts 1+1" -> 2 irb - for interactive ruby commands Download devkit for corresponding ruby version and extract to c:\devkit Browse to c:\devkit and run this: ruby dk.rb init type...

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Installing Ruby on Windows

Development Install Ruby Install DevKit (http://rubyinstaller.org/downloads/) gem install capistrano --no-ri --no-rdoc Deployment Machine Update the software sources list And upgrade the dated applications: aptitude update aptitud...

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Capistrano - Installation and configuration