Use RACK_ENV as usual instead of hard-coded db

Rakefile

@@ -2,20 +2,6 @@ require 'rake'
 require "sinatra/activerecord/rake"
 require ::File.expand_path('../config/environment', __FILE__)
 
-Rake::Task["db:create"].clear
-Rake::Task["db:drop"].clear
-
-# NOTE: Assumes SQLite3 DB
-desc "create the database"
-task "db:create" do
-  touch 'db/db.sqlite3'
-end
-
-desc "drop the database"
-task "db:drop" do
-  rm_f 'db/db.sqlite3'
-end
-
 desc 'Retrieves the current schema version number'
 task "db:version" do
   puts "Current version: #{ActiveRecord::Migrator.current_version}"

config/database.rb

+ENV['RACK_ENV'] ||= 'development'
+DATABASE_PATH = APP_ROOT.join('db', "#{ENV['RACK_ENV']}.sqlite3")
+
 configure do
   # Log queries to STDOUT in development
   if Sinatra::Application.development?
@@ -6,7 +9,7 @@ configure do
 
   set :database, {
     adapter: "sqlite3",
-    database: "db/db.sqlite3"
+    database: DATABASE_PATH
   }
 
   # Load all models from app/models, using autoload instead of require