Add a printer job queue via the printer plugin

plugins/printer/app/models/printer_job.rb

@@ -0,0 +1,31 @@
+class PrinterJob < ActiveRecord::Base
+
+  belongs_to :order
+  belongs_to :created_by, class_name: 'User', foreign_key: 'created_by_user_id'
+  belongs_to :finished_by, class_name: 'User', foreign_key: 'finished_by_user_id'
+  has_many :printer_job_updates
+
+  scope :finished, -> { where.not(finished_at: nil) }
+  scope :unfinished, -> { where(finished_at: nil).order(:id) }
+  scope :pending, -> { unfinished.includes(:order).where.not(orders: {state: 'open'}) }
+  scope :queued, -> { unfinished.includes(:order).where(orders: {state: 'open'}) }
+
+  def last_update_at
+    printer_job_updates.order(:created_at).last.try(&:created_at)
+  end
+
+  def last_update_state
+    printer_job_updates.order(:created_at).last.try(&:state)
+  end
+
+  def add_update!(state, message=nil)
+    return unless finished_at.nil?
+    PrinterJobUpdate.create! printer_job: self, state: state, message: message
+  end
+
+  def finish!(user=nil)
+    return unless finished_at.nil?
+    update_attributes finished_at: Time.now, finished_by: user
+  end
+
+end

plugins/printer/app/models/printer_job_update.rb

@@ -0,0 +1,5 @@
+class PrinterJobUpdate < ActiveRecord::Base
+
+  belongs_to :printer_job
+
+end