pages: do not create a static page if it already exists

* closes CERNDocumentServer/cds-rdm#160

invenio_app_rdm/fixtures/pages.py

@@ -13,6 +13,7 @@
 from invenio_access.permissions import system_identity
 from invenio_db import db
 from invenio_pages.proxies import current_pages_service
+from invenio_pages.records.errors import PageNotFoundError
 from invenio_rdm_records.fixtures.fixture import FixtureMixin
 
 
@@ -45,11 +46,15 @@ def page_data(self, page):
 
     def create(self, entry):
         """Load a single page."""
-        data = {
-            "url": entry.pop("url"),
-            "title": entry.get("title"),
-            "content": self.page_data(entry.get("template")),
-            "description": entry.get("description"),
-            "template_name": current_app.config["PAGES_DEFAULT_TEMPLATE"],
-        }
-        current_pages_service.create(system_identity, data)
+        url = entry["url"]
+        try:
+            current_pages_service.read_by_url(system_identity, url)
+        except PageNotFoundError:
+            data = {
+                "url": url,
+                "title": entry.get("title", ""),
+                "content": self.page_data(entry["template"]),
+                "description": entry.get("description", ""),
+                "template_name": current_app.config["PAGES_DEFAULT_TEMPLATE"],
+            }
+            current_pages_service.create(system_identity, data)