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I tried upgrading my version of rubygems to the most current version by running
sudo gem update –system
Which introduced this error:
/usr/bin/gem:23: uninitialized constant Gem::GemRunner(NameError)
whenever I tried to run rubygems. On the rails forum, I found a fix for it!
Simply add the line to the file /usr/bin/gem (may be different on a mac)
require ‘rubygems/gem_runner’
after
require ‘rubygems’
This fixed […]

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I’ve been writing this web app that has the following models: Order, Recipient, Message. An order has many recipients and a recipient has many messages. The recipients are also dependent upon the order and the messages are dependent upon the recipient.
In Ruby code this looks like:
Order.rb

class Order < ActiveRecord::Base
has_many :recipients, :dependent => :destroy
has_many […]

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