Hck questions

Hck answers

• How to accomplish an update_attributes without actually saving the changes [duplicate]
• How to delete the entire row in the csv file in ruby 1.9.2
• Find in a hash any values greater then a specific value
• How to delete everything from all tables without dropping the database [duplicate]
• Implementing Notifications in Rails
• validate email format only if not blank Rails 3
• Rails edit form not showing nested item
• FactoryGirl trouble
• Flatten a nested json object
• NoMethodError (undefined method `[]' for nil:NilClass)