def handle(self, *args, **options):
        """
        Compares current database with a migrations.
        
        Creates a temporary database, applies all the migrations to it, and
        then dumps the schema from both current and temporary, diffs them,
        then report the diffs to the user.
        """
        self.db = options.get("database", DEFAULT_DB_ALIAS)
        self.current_name = connections[self.db].settings_dict["NAME"]
        self.compare_name = options.get("db_name")
        self.lines = options.get("lines")
        self.ignore = int(options.get('ignore'))

        if not self.compare_name:
            self.compare_name = "%s_compare" % self.current_name
        
        command = NASHVEGAS.get("dumpdb", "pg_dump -s {dbname}")
        
        print "Getting schema for current database..."
        current_sql = Popen(
            command.format(dbname=self.current_name),
            shell=True,
            stdout=PIPE
        ).stdout.readlines()
        
        print "Getting schema for fresh database..."
        self.setup_database()
        connections[self.db].close()
        connections[self.db].settings_dict["NAME"] = self.compare_name
        try:
            call_command("syncdb", interactive=False, verbosity=0, migrations=False)
            new_sql = Popen(
                command.format(dbname=self.compare_name).split(),
                stdout=PIPE
            ).stdout.readlines()
        finally:
            connections[self.db].close()
            connections[self.db].settings_dict["NAME"] = self.current_name
            self.teardown_database()
        
        print "Outputing diff between the two..."
        print "".join(difflib.unified_diff(normalize_sql(current_sql, self.ignore),
                                           normalize_sql(new_sql, self.ignore),
                                           n=int(self.lines)))
Compares current database with a migrations.
        
        Creates a temporary database, applies all the migrations to it, and
        then dumps the schema from both current and temporary, diffs them,
        then report the diffs to the user.