Refactor db:charset task

In a similar vein to Pat's work on create, drop etc, the db:charset
task is now a one liner in databases.rake

activerecord/lib/active_record/railties/databases.rake

@@ -143,20 +143,7 @@ db_namespace = namespace :db do
 
   # desc "Retrieves the charset for the current environment's database"
   task :charset => [:environment, :load_config] do
-    config = ActiveRecord::Base.configurations[Rails.env || 'development']
-    case config['adapter']
-    when /mysql/
-      ActiveRecord::Base.establish_connection(config)
-      puts ActiveRecord::Base.connection.charset
-    when /postgresql/
-      ActiveRecord::Base.establish_connection(config)
-      puts ActiveRecord::Base.connection.encoding
-    when /sqlite/
-      ActiveRecord::Base.establish_connection(config)
-      puts ActiveRecord::Base.connection.encoding
-    else
-      $stderr.puts 'sorry, your database adapter is not supported yet, feel free to submit a patch'
-    end
+    puts ActiveRecord::Tasks::DatabaseTasks.charset_current
   end
 
   # desc "Retrieves the collation for the current environment's database"

activerecord/lib/active_record/tasks/database_tasks.rb

@@ -47,6 +47,15 @@ def drop_current(environment = Rails.env)
         }
       end
 
+      def charset_current(environment = Rails.env)
+        charset ActiveRecord::Base.configurations[environment]
+      end
+
+      def charset(*arguments)
+        configuration = arguments.first
+        class_for_adapter(configuration['adapter']).new(*arguments).charset
+      end
+
       def purge(configuration)
         class_for_adapter(configuration['adapter']).new(configuration).purge
       end

activerecord/lib/active_record/tasks/mysql_database_tasks.rb

@@ -40,6 +40,10 @@ def purge
         connection.recreate_database configuration['database'], creation_options
       end
 
+      def charset
+        connection.charset
+      end
+
       private
 
       def configuration
@@ -90,4 +94,4 @@ def root_password
       end
     end
   end
-end
\ No newline at end of file
+end

activerecord/lib/active_record/tasks/postgresql_database_tasks.rb

@@ -23,6 +23,10 @@ def drop
         connection.drop_database configuration['database']
       end
 
+      def charset
+        connection.encoding
+      end
+
       def purge
         clear_active_connections!
         drop
@@ -47,4 +51,4 @@ def establish_master_connection
       end
     end
   end
-end
\ No newline at end of file
+end

activerecord/lib/active_record/tasks/sqlite_database_tasks.rb

@@ -27,6 +27,10 @@ def drop
       end
       alias :purge :drop
 
+      def charset
+        connection.encoding
+      end
+
       private
 
       def configuration
@@ -38,4 +42,4 @@ def root
       end
     end
   end
-end
\ No newline at end of file
+end

activerecord/test/cases/database_tasks_test.rb

@@ -294,4 +294,38 @@ def test_sqlite_create
       ActiveRecord::Tasks::DatabaseTasks.purge 'adapter' => 'sqlite3'
     end
   end
+
+  class DatabaseTasksCharsetTest < ActiveRecord::TestCase
+    def setup
+      @mysql_tasks, @postgresql_tasks, @sqlite_tasks = stub, stub, stub
+      ActiveRecord::Tasks::MySQLDatabaseTasks.stubs(:new).returns @mysql_tasks
+      ActiveRecord::Tasks::PostgreSQLDatabaseTasks.stubs(:new).
+        returns @postgresql_tasks
+      ActiveRecord::Tasks::SQLiteDatabaseTasks.stubs(:new).returns @sqlite_tasks
+    end
+
+    def test_mysql_charset
+      @mysql_tasks.expects(:charset)
+
+      ActiveRecord::Tasks::DatabaseTasks.charset 'adapter' => 'mysql'
+    end
+
+    def test_mysql2_charset
+      @mysql_tasks.expects(:charset)
+
+      ActiveRecord::Tasks::DatabaseTasks.charset 'adapter' => 'mysql2'
+    end
+
+    def test_postgresql_charset
+      @postgresql_tasks.expects(:charset)
+
+      ActiveRecord::Tasks::DatabaseTasks.charset 'adapter' => 'postgresql'
+    end
+
+    def test_sqlite_charset
+      @sqlite_tasks.expects(:charset)
+
+      ActiveRecord::Tasks::DatabaseTasks.charset 'adapter' => 'sqlite3'
+    end
+  end
 end

activerecord/test/cases/mysql_rake_test.rb

@@ -176,4 +176,22 @@ def test_recreates_database_with_the_given_options
       )
     end
   end
-end
\ No newline at end of file
+
+  class MysqlDBCharsetTest < ActiveRecord::TestCase
+    def setup
+      @connection    = stub(:create_database => true)
+      @configuration = {
+        'adapter'  => 'mysql',
+        'database' => 'my-app-db'
+      }
+
+      ActiveRecord::Base.stubs(:connection).returns(@connection)
+      ActiveRecord::Base.stubs(:establish_connection).returns(true)
+    end
+
+    def test_db_retrieves_charset
+      @connection.expects(:charset)
+      ActiveRecord::Tasks::DatabaseTasks.charset @configuration
+    end
+  end
+end

activerecord/test/cases/postgresql_rake_test.rb

@@ -132,4 +132,22 @@ def test_establishes_connection
       ActiveRecord::Tasks::DatabaseTasks.purge @configuration
     end
   end
-end
\ No newline at end of file
+
+  class PostgreSQLDBCharsetTest < ActiveRecord::TestCase
+    def setup
+      @connection    = stub(:create_database => true)
+      @configuration = {
+        'adapter'  => 'postgresql',
+        'database' => 'my-app-db'
+      }
+
+      ActiveRecord::Base.stubs(:connection).returns(@connection)
+      ActiveRecord::Base.stubs(:establish_connection).returns(true)
+    end
+
+    def test_db_retrieves_charset
+      @connection.expects(:encoding)
+      ActiveRecord::Tasks::DatabaseTasks.charset @configuration
+    end
+  end
+end

activerecord/test/cases/sqlite_rake_test.rb

@@ -103,4 +103,24 @@ def test_removes_file_with_relative_path
       ActiveRecord::Tasks::DatabaseTasks.drop @configuration, '/rails/root'
     end
   end
-end
\ No newline at end of file
+
+  class SqliteDBCharsetTest < ActiveRecord::TestCase
+    def setup
+      @database      = 'db_create.sqlite3'
+      @connection    = stub :connection
+      @configuration = {
+        'adapter'  => 'sqlite3',
+        'database' => @database
+      }
+
+      File.stubs(:exist?).returns(false)
+      ActiveRecord::Base.stubs(:connection).returns(@connection)
+      ActiveRecord::Base.stubs(:establish_connection).returns(true)
+    end
+
+    def test_db_retrieves_charset
+      @connection.expects(:encoding)
+      ActiveRecord::Tasks::DatabaseTasks.charset @configuration, '/rails/root'
+    end
+  end
+end