Add attachment to TOS record

app/models/terms_of_service_file.rb

@@ -1,6 +1,10 @@
 # frozen_string_literal: true
 
 class TermsOfServiceFile < ApplicationRecord
+  has_attached_file :attachment
+
+  validates :attachment, presence: true
+
   # The most recently uploaded file is the current one.
   def self.current
     order(:id).last

db/migrate/20210415052410_add_attachment_to_terms_of_service_file.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class AddAttachmentToTermsOfServiceFile < ActiveRecord::Migration[5.0]
+  def up
+    add_attachment :terms_of_service_files, :attachment
+  end
+
+  def down
+    remove_attachment :terms_of_service_files, :attachment
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_04_15_015550) do
+ActiveRecord::Schema.define(version: 2021_04_15_052410) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1146,8 +1146,12 @@ ActiveRecord::Schema.define(version: 2021_04_15_015550) do
   end
 
   create_table "terms_of_service_files", force: :cascade do |t|
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime "created_at",              null: false
+    t.datetime "updated_at",              null: false
+    t.string   "attachment_file_name"
+    t.string   "attachment_content_type"
+    t.integer  "attachment_file_size"
+    t.datetime "attachment_updated_at"
   end
 
   create_table "variant_overrides", force: :cascade do |t|

spec/models/terms_of_service_file_spec.rb

@@ -3,6 +3,8 @@
 require 'rails_helper'
 
 describe TermsOfServiceFile do
+  let(:pdf) { File.open(Rails.root.join("public/Terms-of-service.pdf")) }
+
   describe ".current" do
     it "returns nil" do
       expect(TermsOfServiceFile.current).to be_nil
@@ -10,8 +12,8 @@ describe TermsOfServiceFile do
 
     it "returns the last one" do
       existing = [
-        TermsOfServiceFile.create!,
-        TermsOfServiceFile.create!,
+        TermsOfServiceFile.create!(attachment: pdf),
+        TermsOfServiceFile.create!(attachment: pdf),
       ]
 
       expect(TermsOfServiceFile.current).to eq existing.last