When creating database with rake, create schemas in schema_search_path if it doesn't exist.

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -651,6 +651,27 @@ module ActiveRecord
         end
       end
 
+      # Creates a schema for the given user
+      #
+      # Example:
+      #   create_schema('products', 'postgres')
+      def create_schema(schema_name, pg_username)
+        execute("CREATE SCHEMA \"#{schema_name}\" AUTHORIZATION \"#{pg_username}\"")
+      end
+
+      # Drops a schema
+      #
+      # Example:
+      #   drop_schema('products', 'postgres')
+      def drop_schema(schema_name)
+        execute("DROP SCHEMA \"#{schema_name}\"")
+      end
+
+      # Returns an array of all schemas in the database
+      def all_schemas
+        query('SELECT schema_name FROM information_schema.schemata').flatten
+      end
+
       # Returns the list of all tables in the schema search path or a specified schema.
       def tables(name = nil)
         query(<<-SQL, name).map { |row| row[0] }

activerecord/lib/active_record/railties/databases.rake

@@ -85,8 +85,14 @@ namespace :db do
         end
       when 'postgresql'
         @encoding = config[:encoding] || ENV['CHARSET'] || 'utf8'
+        schema_search_path = config['schema_search_path'] || 'public'
+        first_in_schema_search_path = schema_search_path.split(',').first.strip
         begin
           ActiveRecord::Base.establish_connection(config.merge('database' => 'postgres', 'schema_search_path' => 'public'))
+          unless ActiveRecord::Base.connection.all_schemas.include?(first_in_schema_search_path)
+            ActiveRecord::Base.connection.create_schema(first_in_schema_search_path, config['username'])
+            $stderr.puts "Schema #{first_in_schema_search_path} has been created."
+          end
           ActiveRecord::Base.connection.create_database(config['database'], config.merge('encoding' => @encoding))
           ActiveRecord::Base.establish_connection(config)
         rescue

activerecord/test/cases/active_schema_test_postgresql.rb

@@ -17,6 +17,13 @@ class PostgresqlActiveSchemaTest < Test::Unit::TestCase
     assert_equal %(CREATE DATABASE "aimonetti" ENCODING = 'latin1'), create_database(:aimonetti, :encoding => :latin1)
   end
 
+  def test_create_schema
+    assert_equal %(CREATE SCHEMA "rizwan" AUTHORIZATION "postgres"), create_schema(:rizwan, :postgres)
+  end
+
+  def test_drop_schema
+    assert_equal %(DROP SCHEMA "rizwan"), drop_schema(:rizwan)
+  end
   private
     def method_missing(method_symbol, *arguments)
       ActiveRecord::Base.connection.send(method_symbol, *arguments)

activerecord/test/cases/adapter_test.rb

@@ -81,6 +81,12 @@ class AdapterTest < ActiveRecord::TestCase
     def test_encoding
       assert_not_nil @connection.encoding
     end
+
+    def test_all_schemas
+      @connection.create_schema(:test_schema, :postgres)
+      assert @connection.all_schemas.include?('test_schema')
+      @connection.drop_schema(:test_schema)
+    end
   end
 
   def test_table_alias