Start extracting a Collection context

lib/music_library/collection.ex

@@ -0,0 +1,55 @@
+defmodule MusicLibrary.Collection do
+  import Ecto.Query, warn: false
+
+  alias MusicLibrary.Repo
+  alias MusicLibrary.Records
+  alias MusicLibrary.Records.Record
+
+  def search_records(query, opts \\ []) do
+    limit = Keyword.get(opts, :limit, 20)
+    offset = Keyword.get(opts, :offset, 0)
+
+    Records.search_records(base_search(), query, limit: limit, offset: offset)
+  end
+
+  def search_records_count(query) do
+    Records.search_records_count(base_search(), query)
+  end
+
+  def count_records_by_format do
+    q =
+      from r in base_search(),
+        group_by: r.format,
+        order_by: [desc: count(r.id)],
+        select: {r.format, count(r.id)}
+
+    Repo.all(q)
+  end
+
+  def count_records_by_type do
+    q =
+      from r in base_search(),
+        group_by: r.type,
+        order_by: [desc: count(r.id)],
+        select: {r.type, count(r.id)}
+
+    Repo.all(q)
+  end
+
+  def get_latest_record! do
+    fields = Records.minimal_record_fields()
+
+    q =
+      from r in base_search(),
+        order_by: [desc: r.purchased_at],
+        limit: 1,
+        select: ^fields
+
+    Repo.one!(q)
+  end
+
+  defp base_search do
+    from r in Record,
+      where: not is_nil(r.purchased_at)
+  end
+end