Initial implementation

.ruby-gemset

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+smartmeter

.ruby-version

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+ruby-1.9.3-p125

Gemfile

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+source "https://rubygems.org"
+
+gem "activerecord", "3.2.13"
+gem "mysql2"
+gem "serialport"
+gem "state_pattern"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    activemodel (3.2.13)
+      activesupport (= 3.2.13)
+      builder (~> 3.0.0)
+    activerecord (3.2.13)
+      activemodel (= 3.2.13)
+      activesupport (= 3.2.13)
+      arel (~> 3.0.2)
+      tzinfo (~> 0.3.29)
+    activesupport (3.2.13)
+      i18n (= 0.6.1)
+      multi_json (~> 1.0)
+    arel (3.0.2)
+    builder (3.0.4)
+    i18n (0.6.1)
+    multi_json (1.7.7)
+    mysql2 (0.3.11)
+    serialport (1.1.0)
+    state_pattern (2.0.1)
+    tzinfo (0.3.37)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activerecord (= 3.2.13)
+  mysql2
+  serialport
+  state_pattern

README.md

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+ActiveRecord Without Rails
+==========================
+
+Just a simple example of using ActiveRecord migrations without Rails
+
+tasks you can do:
+
+* `rake db:create`
+* `rake db:migrate`
+* `rake db:drop`
+
+Or, you can run the thing to show that it'll connect
+
+```
+ruby ar-no-rails
+```
+
+Output:
+> Count of Pages: 0
+
+Lastly, you can IRB it to do stuff:
+
+$ irb
+
+```
+>> require "./ar-no-rails"
+=> true
+>> Page.new
+=> #<Page id: nil, content: nil, published: false>
+>> Page.create content: "the-content"
+=> #<Page id: 1, content: "the-content", published: false>
+```
+
+Copyright
+---------
+None. Really.

Rakefile

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+require "rubygems"
+require "bundler/setup"
+
+require 'mysql2'
+require 'active_record'
+require 'yaml'
+
+namespace :db do
+
+  desc "Migrate the db"
+  task :migrate do
+    connection_details = YAML::load(File.open('config/database.yml'))
+    ActiveRecord::Base.establish_connection(connection_details)
+    ActiveRecord::Migrator.migrate("db/migrate/")
+  end
+
+  desc "Create the db"
+  task :create do
+    connection_details = YAML::load(File.open('config/database.yml'))
+    admin_connection = connection_details.merge({'database'=> 'mysql', 
+                                                'schema_search_path'=> 'public'}) 
+    ActiveRecord::Base.establish_connection(admin_connection)
+    ActiveRecord::Base.connection.create_database(connection_details.fetch('database'))
+  end
+
+  desc "drop the db"
+  task :drop do
+    connection_details = YAML::load(File.open('config/database.yml'))
+    admin_connection = connection_details.merge({'database'=> 'mysql', 
+                                                'schema_search_path'=> 'public'}) 
+    ActiveRecord::Base.establish_connection(admin_connection)
+    ActiveRecord::Base.connection.drop_database(connection_details.fetch('database'))
+  end
+end

app/models/page.rb

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+class Page < ActiveRecord::Base
+
+end

ar-no-rails.rb

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+require "rubygems"
+require "bundler/setup"
+require "active_record"
+
+project_root = File.dirname(File.absolute_path(__FILE__))
+Dir.glob(project_root + "/app/models/*.rb").each{|f| require f}
+
+connection_details = YAML::load(File.open('config/database.yml'))
+ActiveRecord::Base.establish_connection(connection_details)
+
+
+if __FILE__ == $0
+  puts "Count of Pages: #{Page.count}"
+end

config/database.yml

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+host: 'localhost'
+adapter: 'mysql2'
+database: 'smartmeter'
+username: 'root' 
+pool: 5

db/migrate/001_creates_pages.rb

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+class CreatesPages < ActiveRecord::Migration
+  def change
+    create_table :pages do |t|
+      t.text :content
+      t.boolean :published, default: false
+    end
+  end
+end

smartmeter.rb

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+require "rubygems"
+require "bundler/setup"
+require "active_record"
+require "serialport"
+
+project_root = File.dirname(File.absolute_path(__FILE__))
+Dir.glob(project_root + "/app/models/*.rb").each{|f| require f}
+
+connection_details = YAML::load(File.open('config/database.yml'))
+ActiveRecord::Base.establish_connection(connection_details)
+
+# Open connection to serial port
+ser = SerialPort.new("/dev/ttyUSB1", 9600, 7, 1, SerialPort::EVEN)
+
+# read until newline
+response = ser.readline("\r")
+response.chomp!
+print "#{response}\n"