Fix mastodon pagination to use returned IDs

api/pagination.py

@@ -1,5 +1,7 @@
 import dataclasses
 import urllib.parse
+from collections.abc import Callable
+from typing import Any
 
 from django.db import models
 from django.http import HttpRequest
@@ -19,6 +21,9 @@ class PaginationResult:
     #: The actual applied limit, which may be different from what was requested.
     limit: int
 
+    #: A list of transformed JSON objects
+    json_results: list[dict] | None = None
+
     @classmethod
     def empty(cls):
         return cls(results=[], limit=20)
@@ -29,9 +34,10 @@ class PaginationResult:
         """
         if not self.results:
             return None
-
+        if self.json_results is None:
+            raise ValueError("You must JSONify the results first")
         params = self.filter_params(request, allowed_params)
-        params["max_id"] = self.results[-1].pk
+        params["max_id"] = self.json_results[-1]["id"]
 
         return f"{request.build_absolute_uri(request.path)}?{urllib.parse.urlencode(params)}"
 
@@ -41,9 +47,10 @@ class PaginationResult:
         """
         if not self.results:
             return None
-
+        if self.json_results is None:
+            raise ValueError("You must JSONify the results first")
         params = self.filter_params(request, allowed_params)
-        params["min_id"] = self.results[0].pk
+        params["min_id"] = self.json_results[0]["id"]
 
         return f"{request.build_absolute_uri(request.path)}?{urllib.parse.urlencode(params)}"
 
@@ -58,6 +65,45 @@ class PaginationResult:
             )
         )
 
+    def jsonify_results(self, map_function: Callable[[Any], Any]):
+        """
+        Replaces our results with ones transformed via map_function
+        """
+        self.json_results = [map_function(result) for result in self.results]
+
+    def jsonify_posts(self, identity):
+        """
+        Predefined way of JSON-ifying Post objects
+        """
+        interactions = PostInteraction.get_post_interactions(self.results, identity)
+        self.jsonify_results(
+            lambda post: post.to_mastodon_json(interactions=interactions)
+        )
+
+    def jsonify_status_events(self, identity):
+        """
+        Predefined way of JSON-ifying TimelineEvent objects representing statuses
+        """
+        interactions = PostInteraction.get_event_interactions(self.results, identity)
+        self.jsonify_results(
+            lambda event: event.to_mastodon_status_json(interactions=interactions)
+        )
+
+    def jsonify_notification_events(self, identity):
+        """
+        Predefined way of JSON-ifying TimelineEvent objects representing notifications
+        """
+        interactions = PostInteraction.get_event_interactions(self.results, identity)
+        self.jsonify_results(
+            lambda event: event.to_mastodon_notification_json(interactions=interactions)
+        )
+
+    def jsonify_identities(self):
+        """
+        Predefined way of JSON-ifying Identity objects
+        """
+        self.jsonify_results(lambda identity: identity.to_mastodon_json())
+
     @staticmethod
     def filter_params(request: HttpRequest, allowed_params: list[str]):
         params = {}

api/views/accounts.py

@@ -3,7 +3,7 @@ from django.http import HttpRequest, HttpResponse, JsonResponse
 from django.shortcuts import get_object_or_404
 from ninja import Field
 
-from activities.models import Post, PostInteraction
+from activities.models import Post
 from activities.services import SearchService
 from api import schemas
 from api.decorators import identity_required
@@ -143,7 +143,7 @@ def account_statuses(
         queryset = queryset.filter(attachments__pk__isnull=False)
     if tagged:
         queryset = queryset.tagged_with(tagged)
-
+    # Get user posts with pagination
     paginator = MastodonPaginator(Post, sort_attribute="published")
     pager = paginator.paginate(
         queryset,
@@ -152,7 +152,9 @@ def account_statuses(
         since_id=since_id,
         limit=limit,
     )
-
+    # Convert those to the JSON form
+    pager.jsonify_posts(identity=request.identity)
+    # Add a link header if we need to
     if pager.results:
         response.headers["Link"] = pager.link_header(
             request,
@@ -166,11 +168,7 @@ def account_statuses(
                 "tagged",
             ],
         )
-
-    interactions = PostInteraction.get_post_interactions(
-        pager.results, request.identity
-    )
-    return [post.to_mastodon_json(interactions=interactions) for post in pager.results]
+    return pager.json_results
 
 
 @api_router.post("/v1/accounts/{id}/follow", response=schemas.Relationship)
@@ -222,6 +220,7 @@ def account_following(
         since_id=since_id,
         limit=limit,
     )
+    pager.jsonify_identities()
 
     if pager.results:
         response.headers["Link"] = pager.link_header(
@@ -229,4 +228,4 @@ def account_following(
             ["limit"],
         )
 
-    return [result.to_mastodon_json() for result in pager.results]
+    return pager.json_results

api/views/notifications.py

@@ -1,6 +1,6 @@
 from django.http import HttpRequest, HttpResponse
 
-from activities.models import PostInteraction, TimelineEvent
+from activities.models import TimelineEvent
 from activities.services import TimelineService
 from api import schemas
 from api.decorators import identity_required
@@ -43,14 +43,9 @@ def notifications(
         since_id=since_id,
         limit=limit,
     )
+    pager.jsonify_notification_events(identity=request.identity)
 
     if pager.results:
         response.headers["Link"] = pager.link_header(request, ["limit", "account_id"])
 
-    interactions = PostInteraction.get_event_interactions(
-        pager.results, request.identity
-    )
-    return [
-        event.to_mastodon_notification_json(interactions=interactions)
-        for event in pager.results
-    ]
+    return pager.json_results

api/views/statuses.py

@@ -155,6 +155,7 @@ def favourited_by(
         since_id=since_id,
         limit=limit,
     )
+    pager.jsonify_identities()
 
     if pager.results:
         response.headers["Link"] = pager.link_header(
@@ -162,7 +163,7 @@ def favourited_by(
             ["limit"],
         )
 
-    return [result.identity.to_mastodon_json() for result in pager.results]
+    return pager.json_results
 
 
 @api_router.post("/v1/statuses/{id}/reblog", response=schemas.Status)

api/views/timelines.py

@@ -1,6 +1,6 @@
 from django.http import HttpRequest, HttpResponse, JsonResponse
 
-from activities.models import Post, PostInteraction
+from activities.models import Post
 from activities.services import TimelineService
 from api import schemas
 from api.decorators import identity_required
@@ -19,6 +19,7 @@ def home(
     min_id: str | None = None,
     limit: int = 20,
 ):
+    # Grab a paginated result set of instances
     paginator = MastodonPaginator(Post, sort_attribute="published")
     queryset = TimelineService(request.identity).home()
     pager = paginator.paginate(
@@ -28,17 +29,12 @@ def home(
         since_id=since_id,
         limit=limit,
     )
-    interactions = PostInteraction.get_event_interactions(
-        pager.results, request.identity
-    )
-
+    # Convert those to the JSON form
+    pager.jsonify_status_events(identity=request.identity)
+    # Add the link header if needed
     if pager.results:
         response.headers["Link"] = pager.link_header(request, ["limit"])
-
-    return [
-        event.to_mastodon_status_json(interactions=interactions)
-        for event in pager.results
-    ]
+    return pager.json_results
 
 
 @api_router.get("/v1/timelines/public", response=list[schemas.Status])
@@ -64,6 +60,7 @@ def public(
         queryset = queryset.filter(local=False)
     if only_media:
         queryset = queryset.filter(attachments__id__isnull=True)
+    # Grab a paginated result set of instances
     paginator = MastodonPaginator(Post, sort_attribute="published")
     pager = paginator.paginate(
         queryset,
@@ -72,17 +69,15 @@ def public(
         since_id=since_id,
         limit=limit,
     )
-
+    # Convert those to the JSON form
+    pager.jsonify_posts(identity=request.identity)
+    # Add the link header if needed
     if pager.results:
         response.headers["Link"] = pager.link_header(
             request,
             ["limit", "local", "remote", "only_media"],
         )
-
-    interactions = PostInteraction.get_post_interactions(
-        pager.results, request.identity
-    )
-    return [post.to_mastodon_json(interactions=interactions) for post in pager.results]
+    return pager.json_results
 
 
 @api_router.get("/v1/timelines/tag/{hashtag}", response=list[schemas.Status])
@@ -105,6 +100,7 @@ def hashtag(
         queryset = queryset.filter(local=True)
     if only_media:
         queryset = queryset.filter(attachments__id__isnull=True)
+    # Grab a paginated result set of instances
     paginator = MastodonPaginator(Post, sort_attribute="published")
     pager = paginator.paginate(
         queryset,
@@ -113,17 +109,15 @@ def hashtag(
         since_id=since_id,
         limit=limit,
     )
-
+    # Convert those to the JSON form
+    pager.jsonify_posts(identity=request.identity)
+    # Add a link header if we need to
     if pager.results:
         response.headers["Link"] = pager.link_header(
             request,
             ["limit", "local", "remote", "only_media"],
         )
-
-    interactions = PostInteraction.get_post_interactions(
-        pager.results, request.identity
-    )
-    return [post.to_mastodon_json(interactions=interactions) for post in pager.results]
+    return pager.json_results
 
 
 @api_router.get("/v1/conversations", response=list[schemas.Status])