Fix/update template schema (#2214)

* fix: add template_category_id to template schema

* fix: consider template_category_id when deciding if a template has changed

app/schemas.py

@@ -397,6 +397,7 @@ class TemplateSchema(BaseTemplateSchema):
     is_precompiled_letter = fields.Method("get_is_precompiled_letter")
     process_type = field_for(models.Template, "process_type")
     template_category = fields.Nested(TemplateCategorySchema, dump_only=True)
+    template_category_id = fields.UUID(required=False, allow_none=True)
     redact_personalisation = fields.Method("redact")
     created_at = FlexibleDateTime()
     updated_at = FlexibleDateTime()

app/template/rest.py

@@ -273,7 +273,7 @@ def get_template_versions(service_id, template_id):
 def _template_has_not_changed(current_data, updated_template):
     return all(
         current_data[key] == updated_template[key]
-        for key in ("name", "content", "subject", "archived", "process_type", "postage")
+        for key in ("name", "content", "subject", "archived", "process_type", "postage", "template_category_id")
     )