Template history endpoint added. All tests passing.

Code quality fix.

app/dao/templates_dao.py

@@ -22,11 +22,20 @@ def dao_update_template(template):
     db.session.add(template)
 
 
-def dao_get_template_by_id_and_service_id(template_id, service_id):
+def dao_get_template_by_id_and_service_id(template_id, service_id, version=None):
+    if version is not None:
+        return Template.get_history_model().query.filter_by(
+            id=template_id,
+            service_id=service_id,
+            version=version).one()
     return Template.query.filter_by(id=template_id, service_id=service_id).one()
 
 
-def dao_get_template_by_id(template_id):
+def dao_get_template_by_id(template_id, version=None):
+    if version is not None:
+        return Template.get_history_model().query.filter_by(
+            id=template_id,
+            version=version).one()
     return Template.query.filter_by(id=template_id).one()
 
 

app/schemas.py

@@ -1,5 +1,6 @@
 from datetime import date
 from flask_marshmallow.fields import fields
+from sqlalchemy.orm import load_only
 
 from marshmallow import (
     post_load,
@@ -93,6 +94,11 @@ class BaseTemplateSchema(BaseSchema):
 class TemplateSchema(BaseTemplateSchema):
 
     created_by = field_for(models.Template, 'created_by', required=True)
+    versions = fields.Method("template_versions", dump_only=True)
+
+    def template_versions(self, template):
+        return [x.version for x in models.Template.get_history_model().query.filter_by(
+                id=template.id).options(load_only("version"))]
 
     @validates_schema
     def validate_type(self, data):
@@ -103,6 +109,11 @@ class TemplateSchema(BaseTemplateSchema):
                 raise ValidationError('Invalid template subject', 'subject')
 
 
+class TemplateHistorySchema(BaseTemplateSchema):
+
+    created_by = field_for(models.Template, 'created_by', required=True)
+
+
 class NotificationsStatisticsSchema(BaseSchema):
     class Meta:
         model = models.NotificationStatistics
@@ -302,18 +313,6 @@ class ApiKeyHistorySchema(ma.Schema):
     created_by_id = fields.UUID()
 
 
-class TemplateHistorySchema(ma.Schema):
-    id = fields.UUID()
-    name = fields.String()
-    template_type = fields.String()
-    created_at = fields.DateTime()
-    updated_at = fields.DateTime()
-    content = fields.String()
-    service_id = fields.UUID()
-    subject = fields.String()
-    created_by_id = fields.UUID()
-
-
 class EventSchema(BaseSchema):
     class Meta:
         model = models.Event

app/template/rest.py

@@ -15,7 +15,7 @@ from app.dao.templates_dao import (
 )
 from notifications_utils.template import Template
 from app.dao.services_dao import dao_fetch_service_by_id
-from app.schemas import template_schema
+from app.schemas import (template_schema, template_history_schema)
 
 template = Blueprint('template', __name__, url_prefix='/service/<uuid:service_id>/template')
 
@@ -96,5 +96,18 @@ def get_template_by_id_and_service_id(service_id, template_id):
     return jsonify(data=data)
 
 
+@template.route('/<uuid:template_id>/version/<int:version>')
+def get_template_version(service_id, template_id, version):
+    fetched_template = dao_get_template_by_id_and_service_id(
+        template_id=template_id,
+        service_id=service_id,
+        version=version
+    )
+    data, errors = template_history_schema.dump(fetched_template)
+    if errors:
+        return json_resp(result=error, message=errors), 400
+    return jsonify(data=data)
+
+
 def _strip_html(content):
     return bleach.clean(content, tags=[], strip=True)