Connect attachments with objects, not activities.

lib/pleroma/web/twitter_api/representers/activity_representer.ex

@@ -17,7 +17,7 @@ def to_map(%Activity{} = activity, %{user: user} = opts) do
       "created_at" => published,
       "in_reply_to_status_id" => activity.data["object"]["inReplyToStatusId"],
       "statusnet_conversation_id" => activity.data["object"]["statusnetConversationId"],
-      "attachments" => (activity.data["attachment"] || []) |> ObjectRepresenter.enum_to_list(opts)
+      "attachments" => (activity.data["object"]["attachment"] || []) |> ObjectRepresenter.enum_to_list(opts)
     }
   end
 end

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -24,11 +24,11 @@ def create_status(user = %User{}, data = %{}) do
         "type" => "Note",
         "content" => data["status"],
         "published" => date,
-        "context" => context
+        "context" => context,
+        "attachment" => attachments
       },
       "published" => date,
-      "context" => context,
-      "attachment" => attachments
+      "context" => context
     }
 
     # Wire up reply info.

test/web/twitter_api/representers/activity_representer_test.exs

@@ -33,16 +33,16 @@ test "an activity" do
           User.ap_followers(user),
           "https://www.w3.org/ns/activitystreams#Public"
         ],
-        "attachment" => [
-          object
-        ],
         "actor" => User.ap_id(user),
         "object" => %{
           "published" => date,
           "type" => "Note",
           "content" => content,
           "inReplyToStatusId" => 213123,
-          "statusnetConversationId" => 4711
+          "statusnetConversationId" => 4711,
+          "attachment" => [
+            object
+          ]
         },
         "published" => date
       }

test/web/twitter_api/twitter_api_test.exs

@@ -40,7 +40,7 @@ test "create a status" do
     assert get_in(activity.data, ["object", "statusnetConversationId"]) == activity.id
     assert get_in(activity.data, ["statusnetConversationId"]) == activity.id
 
-    assert is_list(activity.data["attachment"])
+    assert is_list(activity.data["object"]["attachment"])
   end
 
   test "create a status that is a reply" do