⚡️(backend) remove content from Document serializer when asked

The frontend can fetch the retrieve endpoint just for having the title.
Everytime, the content is added and to get the content, a request is
made to the s3 bucket. A query string `without_content` can be used, if
the value is `true` then the content is not added (and not also not
fetch).

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to
 - ✨(frontend) Can print a doc #1832
 - ✨(backend) manage reconciliation requests for user accounts #1878
 - 👷(CI) add GHCR workflow for forked repo testing #1851
+- ⚡️(backend) remove content from Document serializer when asked #1910
 - ✨(backend) allow the duplication of subpages #1893
 - ✨(backend) Onboarding docs for new users #1891
 - 🩺(trivy) add trivyignore file and add minimatch CVE #1915

src/backend/core/api/serializers.py

@@ -225,8 +225,16 @@ class DocumentSerializer(ListDocumentSerializer):
         fields = super().get_fields()
 
         request = self.context.get("request")
-        if request and request.method == "POST":
-            fields["id"].read_only = False
+        if request:
+            if request.method == "POST":
+                fields["id"].read_only = False
+            if (
+                serializers.BooleanField().to_internal_value(
+                    request.query_params.get("without_content", False)
+                )
+                is True
+            ):
+                del fields["content"]
 
         return fields
 

src/backend/core/tests/documents/test_api_documents_retrieve.py

@@ -1057,3 +1057,48 @@ def test_api_documents_retrieve_permanently_deleted_related(role, depth):
 
     assert response.status_code == 404
     assert response.json() == {"detail": "Not found."}
+
+
+def test_api_documents_retrieve_without_content():
+    """
+    Test retrieve using without_content query string should remove the content in the response
+    """
+
+    user = factories.UserFactory()
+
+    document = factories.DocumentFactory(creator=user, users=[(user, "owner")])
+
+    client = APIClient()
+    client.force_login(user)
+
+    with mock.patch("core.models.Document.content") as mock_document_content:
+        response = client.get(
+            f"/api/v1.0/documents/{document.id!s}/?without_content=true"
+        )
+
+    assert response.status_code == 200
+
+    payload = response.json()
+    assert "content" not in payload
+    mock_document_content.assert_not_called()
+
+
+def test_api_documents_retrieve_without_content_invalid_value():
+    """
+    Test retrieve using without_content query string but an invalid value
+    should return a 400
+    """
+
+    user = factories.UserFactory()
+
+    document = factories.DocumentFactory(creator=user, users=[(user, "owner")])
+
+    client = APIClient()
+    client.force_login(user)
+
+    response = client.get(
+        f"/api/v1.0/documents/{document.id!s}/?without_content=invalid-value"
+    )
+    assert response.status_code == 400
+
+    assert response.json() == ["Must be a valid boolean."]