* Added basic import support for PostgreSQL.

* Requiring database adapter is now "require 'ar-extensions/import/<adapter_name>" so it won't conflict with previous versions of ar-extensions or other libraries extracted out of older ar-extensions, which "require 'ar-extensions'"

Rakefile

@@ -1,8 +1,16 @@
 require 'rake/testtask'
 
-task :default => [:test]
+task :default => ["display:notice"]
 
-ADAPTERS = %w(mysql postgresql sqlite sqlite3 oracle)
+ADAPTERS = %w(mysql postgresql sqlite3 oracle)
+
+namespace :display do
+  task :notice do
+    puts
+    puts "To run tests you must supply the adapter, see rake -T for more information."
+    puts
+  end
+end
 
 desc "Runs generic database tests."
 Rake::TestTask.new("test") { |t|

lib/ar-extensions.rb

@@ -1,8 +0,0 @@
-require "active_record"
-require "active_record/version"
-
-module ActiveRecord::Extensions
-end
-
-require "ar-extensions/import"
-require "ar-extensions/active_record/adapters/abstract_adapter"

lib/ar-extensions/active_record/adapters/postgresql_adapter.rb

@@ -0,0 +1,9 @@
+module ActiveRecord # :nodoc:
+  module ConnectionAdapters # :nodoc:
+    class PostgreSQLAdapter # :nodoc:
+      def next_value_for_sequence(sequence_name)
+        %{nextval('#{sequence_name}')}
+      end
+    end
+  end
+end

lib/ar-extensions/import/base.rb

@@ -0,0 +1,13 @@
+require "active_record"
+require "active_record/version"
+
+module ActiveRecord::Extensions
+  AdapterPath = File.join File.expand_path(File.dirname(__FILE__)), "/../active_record/adapters"
+  
+  def self.require_adapter(adapter)
+    require File.join(AdapterPath,"/#{adapter}_adapter")
+  end
+end
+
+require "ar-extensions/import"
+require "ar-extensions/active_record/adapters/abstract_adapter"

lib/ar-extensions/import/mysql.rb

@@ -1,3 +1,6 @@
+require "active_record/connection_adapters/mysql_adapter"
+require File.join File.dirname(__FILE__),  "base"
+
 module ActiveRecord::Extensions::ConnectionAdapters::MysqlAdapter # :nodoc:
 
   include ActiveRecord::Extensions::Import::ImportSupport  

lib/ar-extensions/import/postgresql.rb

@@ -0,0 +1,4 @@
+require "active_record/connection_adapters/postgresql_adapter"
+
+require File.join File.dirname(__FILE__),  "base"
+ActiveRecord::Extensions.require_adapter "postgresql"

lib/ar-extensions/import/sqlite3.rb

@@ -0,0 +1,2 @@
+require "active_record/connection_adapters/sqlite3_adapter"
+require File.join File.dirname(__FILE__),  "base"

test/database.yml

@@ -9,9 +9,10 @@ mysql:
   <<: *common
   adapter: mysql
 
-postgres:
+postgresql:
   <<: *common
-  adapter: postgres
+  username: zdennis
+  adapter: postgresql
   min_messages: warning
 
 oracle:

test/import_test.rb

@@ -77,10 +77,13 @@ describe "#import" do
       topic = Generate(:topic, :title => "foobar")
       assert_no_difference "Topic.count" do
         begin
-          topic.title = "baz"
+          Topic.transaction do
-          Topic.import [topic]
+            topic.title = "baz"
+            Topic.import [topic]
+          end
         rescue Exception
-          # no-op
+          # PostgreSQL raises PgError due to key constraints
+          # I don't know why ActiveRecord doesn't catch these. *sigh*
         end
       end
       assert_equal "foobar", topic.reload.title

test/test_helper.rb

@@ -12,7 +12,7 @@ require 'active_support/core_ext/object/returning'
 
 require "delorean"
 
-require "ar-extensions"
+require "active_record"
 require "logger"
 
 require "ruby-debug"
@@ -89,6 +89,9 @@ require "rails"
 class MyApplication < Rails::Application ; end
 adapter = ENV["ARE_DB"] || "sqlite3"
 
+# load the library
+require "ar-extensions/import/#{adapter}"
+
 ActiveRecord::Base.logger = Logger.new("log/test.log")
 ActiveRecord::Base.logger.level = Logger::DEBUG
 ActiveRecord::Base.configurations["test"] = YAML.load(this_dir.join("database.yml").open)[adapter]