Fix for deleting audit template

We need to update sqlalchemy/api and sqlalchemy/models (and appropriate tests)
to support deleting audit templates and recreating them with the same names.

Change-Id: Icf54cf1ed989a3f2ad689e25be4474b16a3a3eb2
Related-Bug: #1510179

watcher/db/sqlalchemy/api.py

@@ -308,6 +308,13 @@ class Connection(api.BaseConnection):
         if not values.get('uuid'):
             values['uuid'] = utils.generate_uuid()
 
+        query = model_query(models.AuditTemplate)
+        query = query.filter_by(name=values.get('name'),
+                                deleted_at=None)
+
+        if len(query.all()) > 0:
+            raise exception.AuditTemplateAlreadyExists(uuid=values['uuid'])
+
         audit_template = models.AuditTemplate()
         audit_template.update(values)
 
@@ -349,14 +356,10 @@ class Connection(api.BaseConnection):
 
     def get_audit_template_by_name(self, context, audit_template_name):
         query = model_query(models.AuditTemplate)
-        query = query.filter_by(name=audit_template_name)
+        query = query.filter_by(name=audit_template_name,
+                                deleted_at=None)
         try:
-            audit_template = query.one()
-            if not context.show_deleted:
-                if audit_template.deleted_at is not None:
-                    raise exception.AuditTemplateNotFound(
-                        audit_template=audit_template_name)
-            return audit_template
+            return query.one()
         except exc.MultipleResultsFound:
             raise exception.Conflict(
                 _('Multiple audit templates exist with the same name.'

watcher/db/sqlalchemy/models.py

@@ -116,7 +116,6 @@ class AuditTemplate(Base):
     __tablename__ = 'audit_templates'
     __table_args__ = (
         schema.UniqueConstraint('uuid', name='uniq_audit_templates0uuid'),
-        schema.UniqueConstraint('name', name='uniq_audit_templates0name'),
         table_args()
     )
     id = Column(Integer, primary_key=True)