Avoid casting to an integer

Not all ids are integers. Existing tests still pass without the cast,
and removing the cast causes uuid joins to work.

activerecord/lib/active_record/disable_joins_association_relation.rb

@@ -30,7 +30,7 @@ def load
         record[key]
       end
 
-      records = ids.flat_map { |id| records_by_id[id.to_i] }
+      records = ids.flat_map { |id| records_by_id[id] }
       records.compact!
 
       @records = records

activerecord/test/cases/adapters/postgresql/uuid_test.rb

@@ -413,3 +413,63 @@ def test_find_by_with_uuid
     assert_nil UuidPost.find_by(id: 789)
   end
 end
+
+class PostgresqlUUIDHasManyThroughDisableJoinsTest < ActiveRecord::PostgreSQLTestCase
+  include PostgresqlUUIDHelper
+
+  class UuidForum < ActiveRecord::Base
+    self.table_name = "pg_uuid_forums"
+    has_many :uuid_posts, -> { order("title DESC") }
+    has_many :uuid_comments, through: :uuid_posts
+    has_many :uuid_comments_without_joins, through: :uuid_posts, source: :uuid_comments, disable_joins: true
+  end
+
+  class UuidPost < ActiveRecord::Base
+    self.table_name = "pg_uuid_posts"
+    belongs_to :uuid_forum
+    has_many :uuid_comments
+  end
+
+  class UuidComment < ActiveRecord::Base
+    self.table_name = "pg_uuid_comments"
+    belongs_to :uuid_post
+    has_one :uuid_forum, through: :uuid_post
+    has_one :uuid_forum_without_joins, through: :uuid_post, source: :uuid_forum, disable_joins: true
+  end
+
+  setup do
+    connection.transaction do
+      connection.create_table("pg_uuid_forums", id: :uuid, **uuid_default) do |t|
+        t.string "name"
+      end
+      connection.create_table("pg_uuid_posts", id: :uuid, **uuid_default) do |t|
+        t.references :uuid_forum, type: :uuid
+        t.string "title"
+      end
+      connection.create_table("pg_uuid_comments", id: :uuid, **uuid_default) do |t|
+        t.references :uuid_post, type: :uuid
+        t.string "content"
+      end
+    end
+  end
+
+  teardown do
+    drop_table "pg_uuid_comments"
+    drop_table "pg_uuid_posts"
+    drop_table "pg_uuid_forums"
+  end
+
+  def test_uuid_primary_key_and_disable_joins_with_delegate_cache
+    uuid_forum = UuidForum.create!
+    uuid_post_1 = uuid_forum.uuid_posts.create!
+    uuid_comment_1_1 = uuid_post_1.uuid_comments.create!
+    uuid_comment_1_2 = uuid_post_1.uuid_comments.create!
+    uuid_post_2 = uuid_forum.uuid_posts.create!
+    uuid_comment_2_1 = uuid_post_2.uuid_comments.create!
+    uuid_comment_2_2 = uuid_post_2.uuid_comments.create!
+    uuid_comment_2_3 = uuid_post_2.uuid_comments.create!
+
+    assert_equal uuid_forum.uuid_comments_without_joins.order(:id).to_a.map(&:id).sort,
+      [uuid_comment_1_1.id, uuid_comment_1_2.id, uuid_comment_2_1.id, uuid_comment_2_2.id, uuid_comment_2_3.id].sort
+  end
+end