fixes #22, AR code doesn't create new connections like it is going out of style

The code that switches ActiveRecord adapters to take a model class
instead of a connection hash or name.

README.textile

@@ -148,7 +148,13 @@ Sometimes you need to use multiple ORMs in your application. You can use Databas
   DatabaseCleaner[:mongo_mapper].strategy = :truncation
 
   #How to specify particular connections
-  DatabaseCleaner[:active_record,{:connection => :two}]
+
+  # with DataMapper you pass in the name of the repository
+  DatabaseCleaner[:data_mapper,{:connection => :my_other_repository}]
+
+  # With ActiveRecord you pass in the model whose #connection DataCleaner should use
+  DatabaseCleaner[:active_record,{:connection => Widget}]
+  DatabaseCleaner[:active_record,{:connection => "Widget"}] # You may pass in the model as a String in case you need/want to delay loading.
 </pre>
 
 Usage beyond that remains the same with DatabaseCleaner.start calling any setup on the different configured connections, and DatabaseCleaner.clean executing afterwards.

examples/features/step_definitions/activerecord_steps.rb

@@ -1,9 +1,9 @@
 Given /^I have setup database cleaner to clean multiple databases using activerecord$/ do
   #DatabaseCleaner
-  # require "#{File.dirname(__FILE__)}/../../../lib/datamapper_models"
+  # require "#{File.dirname(__FILE__)}/../../../lib/activerecord_models"
   #
-  # DatabaseCleaner[:datamapper, {:connection => :one} ].strategy = :truncation
-  # DatabaseCleaner[:datamapper, {:connection => :two} ].strategy = :truncation
+  # DatabaseCleaner[:active_record, {:connection => 'ActiveRecordWidgetUsingDatabaseOne'} ].strategy = whatever
+  # DatabaseCleaner[:active_record, {:connection => 'ActiveRecordWidgetUsingDatabaseTwo'} ].strategy = whatever
 end
 
 When /^I create a widget using activerecord$/ do

examples/features/support/env.rb

@@ -42,9 +42,13 @@ if orm && strategy
     DatabaseCleaner.app_root = "#{File.dirname(__FILE__)}/../.."
     orm_sym = orm.gsub(/(.)([A-Z]+)/,'\1_\2').downcase.to_sym
 
-    if orm_sym == :mongo_mapper
-      DatabaseCleaner[ orm_sym, {:connection => 'database_cleaner_test_one'} ].strategy = strategy.to_sym
-      DatabaseCleaner[ orm_sym, {:connection => 'database_cleaner_test_two'} ].strategy = strategy.to_sym
+    case orm_sym
+    when :mongo_mapper
+      DatabaseCleaner[:mongo_mapper, {:connection => 'database_cleaner_test_one'} ].strategy = strategy.to_sym
+      DatabaseCleaner[:mongo_mapper, {:connection => 'database_cleaner_test_two'} ].strategy = strategy.to_sym
+    when :active_record
+      DatabaseCleaner[:active_record, {:connection => 'ActiveRecordWidgetUsingDatabaseOne'} ].strategy = strategy.to_sym
+      DatabaseCleaner[:active_record, {:connection => 'ActiveRecordWidgetUsingDatabaseTwo'} ].strategy = strategy.to_sym
     else
       DatabaseCleaner[ orm_sym, {:connection => :one} ].strategy = strategy.to_sym
       DatabaseCleaner[ orm_sym, {:connection => :two} ].strategy = strategy.to_sym

features/cleaning_multiple_dbs.feature

@@ -17,5 +17,4 @@ Feature: multiple database cleaning
   | DataMapper   | truncation    |
   | MongoMapper  | truncation    |
   | DataMapper   | transaction   |
-# Not working...
-#| ActiveRecord | transaction   |
+  | ActiveRecord | transaction   |

lib/database_cleaner/active_record/base.rb

@@ -9,44 +9,24 @@ module DatabaseCleaner
       %w[truncation transaction deletion]
     end
 
-    def self.config_file_location=(path)
-      @config_file_location = path
-    end
-
-    def self.config_file_location
-      @config_file_location ||= "#{DatabaseCleaner.app_root}/config/database.yml"
-    end
-
     module Base
       include ::DatabaseCleaner::Generic::Base
 
-      attr_accessor :connection_hash
-
-      def db=(desired_db)
-        @db = desired_db
-        load_config
+      def db=(model_class)
+        @model_class = model_class unless model_class == :default # hack. this design sucks.
+        @connection_class = nil
       end
 
       def db
-        @db || super
+        @model_class || ::ActiveRecord::Base
       end
 
-      def load_config
-        if self.db != :default && File.file?(ActiveRecord.config_file_location)
-          connection_details   = YAML::load(ERB.new(IO.read(ActiveRecord.config_file_location)).result)
-          @connection_hash = connection_details[self.db.to_s]
-        end
+      def connection
+        connection_class.connection
       end
 
-      def create_connection_klass
-        Class.new(::ActiveRecord::Base)
-      end
-
-      def connection_klass
-        return ::ActiveRecord::Base unless connection_hash
-        klass = create_connection_klass
-        klass.send :establish_connection, connection_hash
-        klass
+      def connection_class
+        @connection_class ||=  db.is_a?(String) ? Module.const_get(db) : db
       end
     end
   end

lib/database_cleaner/active_record/deletion.rb

@@ -53,7 +53,6 @@ module DatabaseCleaner::ActiveRecord
   class Deletion < Truncation
 
     def clean
-      connection = connection_klass.connection
       tables_to_truncate(connection).each do |table_name|
         connection.delete_table table_name
       end

lib/database_cleaner/active_record/transaction.rb

@@ -4,24 +4,24 @@ module DatabaseCleaner::ActiveRecord
     include ::DatabaseCleaner::ActiveRecord::Base
 
     def start
-      if connection_klass.connection.respond_to?(:increment_open_transactions)
-        connection_klass.connection.increment_open_transactions
+      if connection.respond_to?(:increment_open_transactions)
+        connection.increment_open_transactions
       else
-        connection_klass.__send__(:increment_open_transactions)
+        connection_class.__send__(:increment_open_transactions)
       end
-      connection_klass.connection.begin_db_transaction
+      connection.begin_db_transaction
     end
 
 
     def clean
-      return unless connection_klass.connection.open_transactions > 0
+      return unless connection.open_transactions > 0
 
-      connection_klass.connection.rollback_db_transaction
+      connection.rollback_db_transaction
 
-      if connection_klass.connection.respond_to?(:decrement_open_transactions)
-        connection_klass.connection.decrement_open_transactions
+      if connection.respond_to?(:decrement_open_transactions)
+        connection.decrement_open_transactions
       else
-        connection_klass.__send__(:decrement_open_transactions)
+        connection_class.__send__(:decrement_open_transactions)
       end
     end
   end

lib/database_cleaner/active_record/truncation.rb

@@ -119,7 +119,6 @@ module DatabaseCleaner::ActiveRecord
     include ::DatabaseCleaner::Generic::Truncation
 
     def clean
-      connection = connection_klass.connection
       connection.disable_referential_integrity do
         connection.truncate_tables(tables_to_truncate(connection))
       end
@@ -138,6 +137,3 @@ module DatabaseCleaner::ActiveRecord
 
   end
 end
-
-
-

spec/database_cleaner/active_record/base_spec.rb

@@ -3,140 +3,37 @@ require 'active_record'
 require 'database_cleaner/active_record/base'
 require 'database_cleaner/shared_strategy_spec'
 
+class FakeModel
+  def self.connection
+    :fake_connection
+  end
+end
+
 module DatabaseCleaner
-  describe ActiveRecord do
-    it { should respond_to(:available_strategies) }
-
-    describe "config_file_location" do
-      subject { ActiveRecord.config_file_location }
-
-      it "should default to DatabaseCleaner.root / config / database.yml" do
-        ActiveRecord.config_file_location=nil
-        DatabaseCleaner.should_receive(:app_root).and_return("/path/to")
-        subject.should == '/path/to/config/database.yml'
-      end
-    end
-
-  end
-
   module ActiveRecord
     class ExampleStrategy
       include ::DatabaseCleaner::ActiveRecord::Base
     end
 
     describe ExampleStrategy do
-      let :config_location do
-        '/path/to/config/database.yml'
-      end
-
-      before { ::DatabaseCleaner::ActiveRecord.stub(:config_file_location).and_return(config_location) }
 
       it_should_behave_like "a generic strategy"
 
-      describe "db" do
 
-        it "should store my desired db" do
-          subject.stub(:load_config)
-
-          subject.db = :my_db
-          subject.db.should == :my_db
+      describe "#connection" do
+        it "returns the connection from ActiveRecord::Base by default" do
+          ::ActiveRecord::Base.stub!(:connection).and_return(:fake_connection)
+          subject.connection.should == :fake_connection
         end
 
-        it "should default to :default" do
-          subject.db.should == :default
+        it "returns the connection of the model provided" do
+          subject.db = FakeModel
+          subject.connection.should == :fake_connection
         end
 
-        it "should load_config when I set db" do
-          subject.should_receive(:load_config)
-          subject.db = :my_db
-        end
-      end
-
-      describe "load_config" do
-
-        before do
-          subject.db = :my_db
-          yaml = <<-Y
-my_db:
-  database: <%= "ONE".downcase %>
-          Y
-          File.stub(:file?).with(config_location).and_return(true)
-          IO.stub(:read).with(config_location).and_return(yaml)
-        end
-
-        it "should parse the config" do
-          YAML.should_receive(:load).and_return( {:nil => nil} )
-          subject.load_config
-        end
-
-        it "should process erb in the config" do
-          transformed = <<-Y
-my_db:
-  database: one
-          Y
-          YAML.should_receive(:load).with(transformed).and_return({ "my_db" => {"database" => "one"} })
-          subject.load_config
-        end
-
-        it "should store the relevant config in connection_hash" do
-          subject.load_config
-          subject.connection_hash.should == {"database" => "one"}
-        end
-
-        it "should skip config if config file is not available" do
-          File.should_receive(:file?).with(config_location).and_return(false)
-          subject.load_config
-          subject.connection_hash.should be_blank
-        end
-
-        it "skips the file when the db is set to :default" do
-          # to avoid https://github.com/bmabey/database_cleaner/issues/72
-          subject.db = :default
-          YAML.should_not_receive(:load)
-          subject.load_config
-        end
-
-      end
-
-      describe "connection_hash" do
-        it "should store connection_hash" do
-          subject.connection_hash = { :key => "value" }
-          subject.connection_hash.should == { :key => "value" }
-        end
-      end
-
-      describe "create_connection_klass" do
-        it "should return a class" do
-          subject.create_connection_klass.should be_a(Class)
-        end
-
-        it "should return a class extending ::ActiveRecord::Base" do
-          subject.create_connection_klass.ancestors.should include(::ActiveRecord::Base)
-        end
-      end
-
-      describe "connection_klass" do
-        it { expect{ subject.connection_klass }.to_not raise_error }
-        it "should default to ActiveRecord::Base" do
-          subject.connection_klass.should == ::ActiveRecord::Base
-        end
-
-        context "when connection_hash is set" do
-          let(:hash) { mock("hash") }
-          before { subject.stub(:connection_hash).and_return(hash) }
-
-          it "should create connection_klass if it doesnt exist if connection_hash is set" do
-            subject.should_receive(:create_connection_klass).and_return(mock('class').as_null_object)
-            subject.connection_klass
-          end
-
-          it  "should configure the class from create_connection_klass if connection_hash is set" do
-            klass = mock('klass')
-            klass.should_receive(:establish_connection).with(hash)
-
-            subject.should_receive(:create_connection_klass).and_return(klass)
-            subject.connection_klass
-          end
+        it "allows for the model to be passed in as a string" do
+          subject.db = "FakeModel"
+          subject.connection.should == :fake_connection
         end
       end
     end