Fixes active record 7 compatibility

Rakefile

@@ -11,7 +11,7 @@ namespace :db do
   task :migrate do
     connection_details = YAML::load(File.open('config/database.yml'))
     ActiveRecord::Base.establish_connection(connection_details)
-    ActiveRecord::Migrator.migrate("db/migrate/")
+    ActiveRecord::MigrationContext.new("db/migrate/").migrate
   end
 
   desc "Create the db"

db/migrate/003_creates_prices.rb

@@ -1,4 +1,4 @@
-class CreatesPrices << ActiveRecord::Migration[4.2]
+class CreatesPrices < ActiveRecord::Migration[4.2]
   def change
     create_table :prices do |t|
       t.datetime :hour
@@ -7,4 +7,5 @@ class CreatesPrices << ActiveRecord::Migration[4.2]
     end  
     
     add_index :prices, :hour 
+  end
 end

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     restart: unless-stopped
     image: mysql:8.3
     volumes:
-      - /home/pcog/smartmeter/data:/var/lib/mysql
+      - $PWD/data:/var/lib/mysql
     ports:
       - 3306:3306
     environment:
@@ -15,8 +15,8 @@ services:
     restart: unless-stopped
     build: .
     command: 'ruby ./smartmeter.rb'
-    devices:
-      - "/dev/ttyUSB1:/dev/ttyUSB0"
+    #devices:
+    #  - "/dev/ttyUSB1:/dev/ttyUSB0"
     volumes:
       - .:/usr/src/app
     depends_on: