unknown attribute 'guid' for NfcTag. raise

20220816124058_create_nfc_tags

class CreateNfcTags < ActiveRecord::Migration[6.1]
  def change
    create_table :nfc_tags do |t|
      t.string :guid
      t.integer :number

      t.timestamps
    end
  end
end

app.rb

require "rubygems"
require "bundler"
Bundler.require

require "sinatra"
require "securerandom"
require "sinatra/activerecord"
require "debug"

set :database, { adapter: "sqlite3", database: "nfc_writer_helper.sqlite3" }

class NfcTag < ActiveRecord::Base
end

get "/:number" do
  begin
    tag = NfcTag.find number: params[:number]
  rescue ActiveRecord::RecordNotFound
    tag = NfcTag.create guid: SecureRandom.uuid, number: params[:number].to_i
  end

  "https://MY_URL.TEST/id/#{tag.guid}/?nfc_number=#{tag.number}"
end

schema.rb

# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# This file is the source Rails uses to define your schema when running `bin/rails
# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
# be faster and is potentially less error prone than running all of your
# migrations from scratch. Old migrations may fail to apply correctly if those
# migrations use external dependencies or application code.
#
# It's strongly recommended that you check this file into your version control system.

ActiveRecord::Schema.define(version: 2022_08_16_124058) do

  create_table "nfc_tags", force: :cascade do |t|
    t.string "guid"
    t.integer "number"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
  end

end