Migrate homepage to use bulk allowed_resources() and fix NULL handling in SQL JOINs

- Updated IndexView in datasette/views/index.py to fetch all allowed databases and tables
  in bulk upfront using allowed_resources() instead of calling check_visibility() for each
  database, table, and view individually
- Fixed SQL bug in build_allowed_resources_sql() where USING (parent, child) clauses failed
  for database resources because NULL = NULL evaluates to NULL in SQL, not TRUE
- Changed all INNER JOINs to use explicit ON conditions with NULL-safe comparisons:
  ON b.parent = x.parent AND (b.child = x.child OR (b.child IS NULL AND x.child IS NULL))

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

datasette/utils/actions_sql.py

@@ -255,9 +255,9 @@ async def build_allowed_resources_sql(
                 "      ELSE 0",
                 "    END AS anon_is_allowed",
                 "  FROM base b",
-                "  JOIN anon_child_lvl acl USING (parent, child)",
-                "  JOIN anon_parent_lvl apl USING (parent, child)",
-                "  JOIN anon_global_lvl agl USING (parent, child)",
+                "  JOIN anon_child_lvl acl ON b.parent = acl.parent AND (b.child = acl.child OR (b.child IS NULL AND acl.child IS NULL))",
+                "  JOIN anon_parent_lvl apl ON b.parent = apl.parent AND (b.child = apl.child OR (b.child IS NULL AND apl.child IS NULL))",
+                "  JOIN anon_global_lvl agl ON b.parent = agl.parent AND (b.child = agl.child OR (b.child IS NULL AND agl.child IS NULL))",
                 "),",
             ]
         )
@@ -306,14 +306,16 @@ async def build_allowed_resources_sql(
     query_parts.extend(
         [
             "  FROM base b",
-            "  JOIN child_lvl cl USING (parent, child)",
-            "  JOIN parent_lvl pl USING (parent, child)",
-            "  JOIN global_lvl gl USING (parent, child)",
+            "  JOIN child_lvl cl ON b.parent = cl.parent AND (b.child = cl.child OR (b.child IS NULL AND cl.child IS NULL))",
+            "  JOIN parent_lvl pl ON b.parent = pl.parent AND (b.child = pl.child OR (b.child IS NULL AND pl.child IS NULL))",
+            "  JOIN global_lvl gl ON b.parent = gl.parent AND (b.child = gl.child OR (b.child IS NULL AND gl.child IS NULL))",
         ]
     )
 
     if include_is_private:
-        query_parts.append("  JOIN anon_decisions ad USING (parent, child)")
+        query_parts.append(
+            "  JOIN anon_decisions ad ON b.parent = ad.parent AND (b.child = ad.child OR (b.child IS NULL AND ad.child IS NULL))"
+        )
 
     query_parts.append(")")
 

datasette/views/index.py

@@ -26,27 +26,47 @@ class IndexView(BaseView):
     async def get(self, request):
         as_format = request.url_vars["format"]
         await self.ds.ensure_permissions(request.actor, ["view-instance"])
+
+        # Get all allowed databases and tables in bulk
+        allowed_databases = await self.ds.allowed_resources(
+            "view-database", request.actor, include_is_private=True
+        )
+        allowed_db_dict = {r.parent: r for r in allowed_databases}
+
+        allowed_tables = await self.ds.allowed_resources(
+            "view-table", request.actor, include_is_private=True
+        )
+        # Group by database
+        tables_by_db = {}
+        for t in allowed_tables:
+            if t.parent not in tables_by_db:
+                tables_by_db[t.parent] = {}
+            tables_by_db[t.parent][t.child] = t
+
         databases = []
-        for name, db in self.ds.databases.items():
-            database_visible, database_private = await self.ds.check_visibility(
-                request.actor,
-                "view-database",
-                name,
-            )
-            if not database_visible:
-                continue
-            table_names = await db.table_names()
+        # Iterate over allowed databases instead of all databases
+        for name in allowed_db_dict.keys():
+            db = self.ds.databases[name]
+            database_private = allowed_db_dict[name].private
+
+            # Get allowed tables/views for this database
+            allowed_for_db = tables_by_db.get(name, {})
+
+            # Get table names from allowed set instead of db.table_names()
+            table_names = [child_name for child_name in allowed_for_db.keys()]
+
             hidden_table_names = set(await db.hidden_table_names())
 
-            views = []
-            for view_name in await db.view_names():
-                view_visible, view_private = await self.ds.check_visibility(
-                    request.actor,
-                    "view-table",
-                    (name, view_name),
-                )
-                if view_visible:
-                    views.append({"name": view_name, "private": view_private})
+            # Determine which allowed items are views
+            view_names_set = set(await db.view_names())
+            views = [
+                {"name": child_name, "private": resource.private}
+                for child_name, resource in allowed_for_db.items()
+                if child_name in view_names_set
+            ]
+
+            # Filter to just tables (not views) for table processing
+            table_names = [name for name in table_names if name not in view_names_set]
 
             # Perform counts only for immutable or DBS with <= COUNT_TABLE_LIMIT tables
             table_counts = {}
@@ -58,13 +78,10 @@ class IndexView(BaseView):
 
             tables = {}
             for table in table_names:
-                visible, private = await self.ds.check_visibility(
-                    request.actor,
-                    "view-table",
-                    (name, table),
-                )
-                if not visible:
+                # Check if table is in allowed set
+                if table not in allowed_for_db:
                     continue
+
                 table_columns = await db.table_columns(table)
                 tables[table] = {
                     "name": table,
@@ -74,7 +91,7 @@ class IndexView(BaseView):
                     "hidden": table in hidden_table_names,
                     "fts_table": await db.fts_table(table),
                     "num_relationships_for_sorting": 0,
-                    "private": private,
+                    "private": allowed_for_db[table].private,
                 }
 
             if request.args.get("_sort") == "relationships" or not table_counts: