- active record dependency. People rarely use active record, and if t…

…hey do, they pull it in themselves.

P.S: FREEDOOOOOM!

server/lib/picky.rb

@@ -13,7 +13,6 @@ class << self
   require 'text'
   require 'yajl'
   require 'active_support/core_ext'
-  require 'active_record'
 
   # Require the constants.
   #

server/lib/picky/sources/db.rb

@@ -33,11 +33,22 @@ class DB < Base
       @@traversal_id = :__picky_id
 
       def initialize select_statement, options = { file: 'app/db.yml' }
+        check_gem
+
         @select_statement = select_statement
         @database         = create_database_adapter
         @options          = options
       end
 
+      # Tries to require the active_record gem.
+      #
+      def check_gem # :nodoc:
+        require 'active_record'
+      rescue LoadError
+        warn_gem_missing 'active_record', 'the (ActiveRecord) DB source'
+        exit 1
+      end
+
       def to_s
         parameters = [select_statement.inspect]
         parameters << options unless options.empty?