Fix ArgumentError when loading newer Private Mentions (#25399)

app/controllers/api/v1/conversations_controller.rb

@@ -45,7 +45,7 @@ class Api::V1::ConversationsController < Api::BaseController
                            },
                          ]
                        )
-                       .to_a_paginated_by_id(limit_param(LIMIT), **params_slice(:max_id, :since_id, :min_id))
+                       .to_a_paginated_by_id(limit_param(LIMIT), params_slice(:max_id, :since_id, :min_id))
   end
 
   def insert_pagination_headers

app/models/account_conversation.rb

@@ -43,22 +43,21 @@ class AccountConversation < ApplicationRecord
   end
 
   class << self
-    def to_a_paginated_by_id(limit, min_id: nil, max_id: nil, since_id: nil, preload_participants: true)
+    def to_a_paginated_by_id(limit, options = {})
       array = begin
-        if min_id
-          paginate_by_min_id(limit, min_id, max_id).reverse
+        if options[:min_id]
+          paginate_by_min_id(limit, options[:min_id], options[:max_id]).reverse
         else
-          paginate_by_max_id(limit, max_id, since_id).to_a
+          paginate_by_max_id(limit, options[:max_id], options[:since_id]).to_a
         end
       end
 
-      if preload_participants
-        participant_ids = array.flat_map(&:participant_account_ids)
-        accounts_by_id = Account.where(id: participant_ids).index_by(&:id)
+      # Preload participants
+      participant_ids = array.flat_map(&:participant_account_ids)
+      accounts_by_id = Account.where(id: participant_ids).index_by(&:id)
 
-        array.each do |conversation|
-          conversation.participant_accounts = conversation.participant_account_ids.filter_map { |id| accounts_by_id[id] }
-        end
+      array.each do |conversation|
+        conversation.participant_accounts = conversation.participant_account_ids.filter_map { |id| accounts_by_id[id] }
       end
 
       array

spec/controllers/api/v1/conversations_controller_spec.rb

@@ -35,5 +35,23 @@ RSpec.describe Api::V1::ConversationsController do
       json = body_as_json
       expect(json.size).to eq 1
     end
+
+    context 'with since_id' do
+      context 'when requesting old posts' do
+        it 'returns conversations' do
+          get :index, params: { since_id: Mastodon::Snowflake.id_at(1.hour.ago, with_random: false) }
+          json = body_as_json
+          expect(json.size).to eq 1
+        end
+      end
+
+      context 'when requesting posts in the future' do
+        it 'returns no conversation' do
+          get :index, params: { since_id: Mastodon::Snowflake.id_at(1.hour.from_now, with_random: false) }
+          json = body_as_json
+          expect(json.size).to eq 0
+        end
+      end
+    end
   end
 end