Update

lib/nulla/activitypub.ex

@@ -85,47 +85,58 @@ defmodule Nulla.ActivityPub do
     )
   end
 
-  @spec note(String.t(), Nulla.Models.User.t(), Nulla.Models.Note.t()) :: Jason.OrderedObject.t()
-  def note(domain, user, note) do
+  @spec note(String.t(), Nulla.Models.Note.t()) :: Jason.OrderedObject.t()
+  def note(domain, note) do
+    attachment =
+    case note.media_attachments do
+      [] -> []
+      attachments ->
+        [
+          attachment:
+            Enum.map(attachments, fn att ->
+              Jason.OrderedObject.new(
+                type: "Document",
+                mediaType: att.mime_type,
+                url: "https://#{domain}/files/#{att.file}"
+              )
+            end)
+        ]
+    end
+
     Jason.OrderedObject.new(
       "@context": [
         "https://www.w3.org/ns/activitystreams",
         Jason.OrderedObject.new(sensitive: "as:sensitive")
       ],
-      id: "https://#{domain}/@#{user.username}/#{note.id}",
+      id: "https://#{domain}/@#{note.user.username}/#{note.id}",
       type: "Note",
       summary: nil,
       inReplyTo: nil,
       published: note.inserted_at,
-      url: "https://#{domain}/@#{user.username}/#{note.id}",
-      attributedTo: "https://#{domain}/@#{user.username}",
+      url: "https://#{domain}/@#{note.user.username}/#{note.id}",
+      attributedTo: "https://#{domain}/@#{note.user.username}",
       to: [
         "https://www.w3.org/ns/activitystreams#Public"
       ],
       cc: [
-        "https://#{domain}/@#{user.username}/followers"
+        "https://#{domain}/@#{note.user.username}/followers"
       ],
       sensetive: false,
       content: note.content,
       contentMap: Jason.OrderedObject.new("#{note.language}": note.content),
-      attachment: [
-        Jason.OrderedObject.new(
-          type: "Document",
-          mediaType: "#{note.media_attachment.mime_type}",
-          url: "https://#{domain}/files/#{note.media_attachment.file}"
-        )
-      ]
+      attachment: attachment
     )
   end
 
-  def activity(domain, action) do
+  @spec activity(String.t(), Nulla.Models.Activity.t()) :: Jason.OrderedObject.t()
+  def activity(domain, activity) do
     Jason.OrderedObject.new(
       "@context": "https://www.w3.org/ns/activitystreams",
-      id: "https://#{domain}/activities/#{action.id}",
-      type: action.type,
-      actor: action.actor,
-      object: action.object,
-      to: action.to
+      id: "https://#{domain}/activities/#{activity.id}",
+      type: activity.type,
+      actor: activity.actor,
+      object: activity.object,
+      to: activity.to
     )
   end
 end

lib/nulla/models/note.ex

@@ -29,5 +29,7 @@ defmodule Nulla.Models.Note do
     |> validate_required([:content, :visibility, :sensitive, :language, :in_reply_to, :user_id])
   end
 
+  def get_note!(id), do: Repo.get!(Note, id)
+
   def get_all_notes!(user_id), do: Repo.all(from n in Note, where: n.user_id == ^user_id)
 end