PostgreSQL: create_ and drop_database support. Closes #9042.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@9182 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* PostgreSQL: create_ and drop_database support.  #9042 [ez, pedz, nicksieger]
+
 * Ensure that validates_uniqueness_of works with with_scope. Closes #9235. [nik.wakelin, cavalle]
 
 * Partial updates include only unsaved attributes. Off by default; set YourClass.partial_updates = true to enable.  [Jeremy Kemper]

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -474,6 +474,50 @@ module ActiveRecord
 
       # SCHEMA STATEMENTS ========================================
 
+      def recreate_database(name) #:nodoc:
+        drop_database(name)
+        create_database(name)
+      end
+
+      # Create a new PostgreSQL database.  Options include :owner, :template,
+      # :encoding, :tablespace, and :connection_limit (note that MySQL uses
+      # :charset while PostgreSQL uses :encoding).
+      #
+      # Example:
+      #   create_database config[:database], config
+      #   create_database 'foo_development', :encoding => 'unicode'
+      def create_database(name, options = {})
+        options = options.reverse_merge(:encoding => "utf8")
+
+        option_string = options.symbolize_keys.sum do |key, value|
+          case key
+          when :owner
+            " OWNER = '#{value}'"
+          when :template
+            " TEMPLATE = #{value}"
+          when :encoding
+            " ENCODING = '#{value}'"
+          when :tablespace
+            " TABLESPACE = #{value}"
+          when :connection_limit
+            " CONNECTION LIMIT = #{value}"
+          else
+            ""
+          end
+        end
+
+        execute "CREATE DATABASE #{name}#{option_string}"
+      end
+
+      # Drops a PostgreSQL database
+      #
+      # Example:
+      #   drop_database 'matt_development'
+      def drop_database(name) #:nodoc:
+        execute "DROP DATABASE IF EXISTS #{name}"
+      end
+
+
       # Returns the list of all tables in the schema search path or a specified schema.
       def tables(name = nil)
         schemas = schema_search_path.split(/,/).map { |p| quote(p) }.join(',')

activerecord/test/cases/active_schema_test_postgresql.rb

@@ -0,0 +1,24 @@
+require 'cases/helper'
+
+class PostgresqlActiveSchemaTest < Test::Unit::TestCase
+  def setup
+    ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.class_eval do
+      alias_method :real_execute, :execute
+      def execute(sql, name = nil) sql end
+    end
+  end
+
+  def teardown
+    ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.send(:alias_method, :execute, :real_execute)
+  end
+
+  def test_create_database_with_encoding
+    assert_equal "CREATE DATABASE matt ENCODING = 'utf8'", create_database(:matt)
+    assert_equal "CREATE DATABASE aimonetti ENCODING = 'latin1'", create_database(:aimonetti, :encoding => :latin1)
+  end
+
+  private
+    def method_missing(method_symbol, *arguments)
+      ActiveRecord::Base.connection.send(method_symbol, *arguments)
+    end
+end