Use has_many through association for user feeds

lib/frenzy/user.ex

@@ -12,6 +12,7 @@ defmodule Frenzy.User do
     has_many :approved_clients, Frenzy.ApprovedClient, on_delete: :delete_all
 
     has_many :groups, Frenzy.Group, on_delete: :delete_all
+    has_many :feeds, through: [:groups, :feeds]
 
     timestamps()
   end

lib/frenzy_web/controllers/fervor/items_controller.ex

@@ -7,13 +7,11 @@ defmodule FrenzyWeb.Fervor.ItemsController do
   plug :get_specific_item
 
   def get_specific_item(%Plug.Conn{path_params: %{"id" => id}} = conn, _opts) do
-    user = conn.assigns[:user] |> Repo.preload(groups: [:feeds])
-
-    feeds = Enum.flat_map(user.groups, fn g -> g.feeds end)
+    user = conn.assigns[:user] |> Repo.preload(:feeds)
 
     item = Repo.get(Item, id)
 
-    if Enum.any?(feeds, fn f -> f.id == item.feed_id end) do
+    if Enum.any?(user.feeds, fn f -> f.id == item.feed_id end) do
       assign(conn, :item, item)
     else
       conn

lib/frenzy_web/controllers/item_controller.ex

@@ -10,9 +10,7 @@ defmodule FrenzyWeb.ItemController do
 
     item = Repo.get(Item, id)
 
-    feeds = Enum.flat_map(user.groups, fn g -> g.feeds end)
-
-    if Enum.any?(feeds, fn f -> f.id == item.feed_id end) do
+    if Enum.any?(user.feeds, fn f -> f.id == item.feed_id end) do
       conn
       |> assign(:item, item)
     else

lib/frenzy_web/plug/authenticate.ex

@@ -25,7 +25,7 @@ defmodule FrenzyWeb.Plug.Authenticate do
             |> halt()
 
           user ->
-            user = Repo.preload(user, groups: [:feeds])
+            user = Repo.preload(user, [:groups, :feeds])
             assign(conn, :user, user)
         end
     end