logs user info in officer_assignments

In case user is no longer a poll officer, info on who did what is
stored in officer_assignment

app/models/poll/officer_assignment.rb

@@ -15,5 +15,11 @@ class Poll
 
     scope :voting_days, -> { where(final: false) }
     scope :final,       -> { where(final: true) }
+
+    before_create :log_user_data
+
+    def log_user_data
+      self.user_data_log = "#{officer.user_id} - #{officer.user.name_and_email}"
+    end
   end
 end

db/migrate/20170208114548_add_user_data_log_to_poll_officer_assignments.rb

@@ -0,0 +1,5 @@
+class AddUserDataLogToPollOfficerAssignments < ActiveRecord::Migration
+  def change
+    add_column :poll_officer_assignments, :user_data_log, :string, default: ""
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170203163317) do
+ActiveRecord::Schema.define(version: 20170208114548) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -433,6 +433,7 @@ ActiveRecord::Schema.define(version: 20170203163317) do
     t.datetime "updated_at",                          null: false
     t.date     "date",                                null: false
     t.boolean  "final",               default: false
+    t.string   "user_data_log",       default: ""
   end
 
   create_table "poll_officers", force: :cascade do |t|

spec/models/poll/officer_assignment_spec.rb

@@ -0,0 +1,12 @@
+require 'rails_helper'
+
+describe :officer_assignment do
+  it "should log user data on creation" do
+    user = create(:user, username: "Larry Bird", email: "larry@lege.nd")
+    officer = create(:poll_officer, user: user)
+
+    oa = create(:poll_officer_assignment, officer: officer)
+
+    expect(oa.reload.user_data_log).to eq "#{user.id} - Larry Bird (larry@lege.nd)"
+  end
+end