add support for user name changes

app/models/user_name_change_request.rb

@@ -0,0 +1,48 @@
+class UserNameChangeRequest < ActiveRecord::Base
+  validates_presence_of :user_id, :original_name, :desired_name
+  validates_inclusion_of :status, :in => %w(pending approved rejected)
+  belongs_to :user
+  belongs_to :approver, :class_name => "User"
+  validate :uniqueness_of_desired_name
+  validates_length_of :desired_name, :within => 2..100, :on => :create
+  validates_format_of :desired_name, :with => /\A[^\s:]+\Z/, :on => :create, :message => "cannot have whitespace or colons"
+  after_create :notify_admins
+  
+  def self.pending
+    where(:status => "pending")
+  end
+  
+  def feedback
+    UserFeedback.for_user(user_id).order("id desc").all
+  end
+  
+  def notify_admins
+    title = "#{original_name} is requesting a name change to #{desired_name}"
+    body = title + "\n\n\"See request\":/user_name_change_requests/#{id}"
+    User.admins.find_each do |user|
+      Dmail.create_split(:title => title, :body => body, :to_id => user.id)
+    end
+  end
+  
+  def approve!
+    update_attribute(:status, "approved")
+    user.update_attribute(:name, desired_name)
+    body = "Your name change request has been approved. Be sure to log in with your new user name."
+    Dmail.create_split(:title => "Name change request approved", :body => body, :to_id => user_id)
+  end
+  
+  def reject!(reason)
+    update_attributes(:status => "rejected", :rejection_reason => reason)
+    body = "Your name change request has been rejected for the following reason: #{rejection_reason}"
+    Dmail.create_split(:title => "Name change request rejected", :body => body, :to_id => user_id)
+  end
+  
+  def uniqueness_of_desired_name
+    if User.find_by_name(desired_name)
+      errors.add(:desired_name, "already exists")
+      return false
+    else
+      return true
+    end
+  end
+end