Add ability to delete a group

lib/mobilizon/actors/member.ex

@@ -6,6 +6,7 @@ defmodule Mobilizon.Actors.Member do
   import Ecto.Changeset
   alias Mobilizon.Actors.Member
   alias Mobilizon.Actors.Actor
+  alias Mobilizon.Repo
 
   schema "members" do
     field(:approved, :boolean, default: true)
@@ -24,4 +25,22 @@ defmodule Mobilizon.Actors.Member do
     |> validate_required([:parent_id, :actor_id])
     |> unique_constraint(:parent_id, name: :members_actor_parent_unique_index)
   end
+
+  @doc """
+  Gets a single member of an actor (for example a group)
+  """
+  def get_member(actor_id, parent_id) do
+    case Repo.get_by(Member, actor_id: actor_id, parent_id: parent_id) do
+      nil -> {:error, :member_not_found}
+      member -> {:ok, member}
+    end
+  end
+
+  def is_administrator(%Member{role: 2} = member) do
+    {:is_admin, true}
+  end
+
+  def is_administrator(%Member{}) do
+    {:is_admin, false}
+  end
 end