Add function to retrieve survey configurations from DB.

As the survey definitions will no longer be stored in files
under etc/surveys/ but directly on the database, this
function replaces configuration.surveys()

bin/datastore.py

@@ -589,6 +589,36 @@ class Datastore:
 			# we assume that we are in the middle of a transaction
 
 
+
+	def surveys (self, include_archived = False):
+		"""
+		Return list of survey definitions.
+		"""
+
+		if self.conn is None:
+			self.connect()
+
+		if include_archived:
+			qry = """
+				SELECT meta
+				FROM public.projects;
+			"""
+		else:
+			qry = """
+				SELECT meta
+				FROM public.projects
+				WHERE NOT (meta->'archived')::boolean IS true
+			"""
+
+		with self.conn:
+			with self.conn.cursor() as cursor:
+
+				cursor.execute(qry)
+				results = cursor.fetchall()
+				return [r[0] for r in results if r[0]]
+
+
+	# TODO Does this need tweaking on account of #246?
 	def apply_survey_configuration(self, cursor = None):
 		if cursor is None:
 			cur = self.conn.cursor()