stuart11n

git branch -m old_branch new_branch         # Rename branch locally    
git push origin :old_branch                 # Delete the old branch    
git push --set-upstream origin new_branch   # Push the new branch, set local branch to track the new remote

kalys

page.execute_script(%Q{$("#scrollElement").prop("scrollTop", 1000000).trigger('scroll')}) 

kalmbach

namespace :db do
  require "sequel"
  Sequel.extension :migration
  DB = Sequel.connect(ENV['DATABASE_URL'])
  
  desc "Prints current schema version"
  task :version do    
    version = if DB.tables.include?(:schema_info)
      DB[:schema_info].first[:version]
    end || 0

qen

class MyGem
  class << self
    attr_accessor :color
  end
  
  def self.configure(&block)
    instance_eval(&block)
  end
end

runemadsen

Polymorphic Associations reversed

It's pretty easy to do polymorphic associations in Rails: A Picture can belong to either a BlogPost or an Article. But what if you need the relationship the other way around? A Picture, a Text and a Video can belong to an Article, and that article can find all media by calling @article.media

This example shows how to create an ArticleElement join model that handles the polymorphic relationship. To add fields that are common to all polymorphic models, add fields to the join model.

justinko

class MyGem
  class << self
    attr_accessor :color
  end
  
  def self.configure(&block)
    instance_eval(&block)
  end
end