Tweak Materials to allow anything

db/migrate/20200710215300_add_url_to_rooms.rb

@@ -1,5 +1,5 @@
 class AddUrlToRooms < ActiveRecord::Migration[5.2]
   def change
-    add_column :rooms, :url, :text
+    add_column :rooms, :url, :string
   end
 end

db/schema.rb

@@ -406,7 +406,7 @@ ActiveRecord::Schema.define(version: 2020_07_10_215300) do
     t.string "name", null: false
     t.integer "size"
     t.integer "venue_id", null: false
-    t.text "url"
+    t.string "url"
   end
 
   create_table "schedules", force: :cascade do |t|