Use ->> instead of json_extract in queries

Improves readability of queries.

lib/music_library/collection.ex

@@ -78,11 +78,11 @@ defmodule MusicLibrary.Collection do
     q =
       from r in fragment("records, json_each(records.artists)"),
         where: fragment("records.purchased_at IS NOT NULL"),
-        group_by: fragment("json_extract(?, '$.name')", r.value),
+        group_by: fragment("? ->> '$.name'", r.value),
         order_by: [desc: fragment("count(1)")],
         select: %{
-          id: fragment("json_extract(?, '$.musicbrainz_id')", r.value),
-          name: fragment("json_extract(?, '$.name')", r.value),
+          id: fragment("? ->> '$.musicbrainz_id'", r.value),
+          name: fragment("? ->> '$.name'", r.value),
           count: fragment("count(1)")
         },
         limit: ^limit

lib/music_library/records.ex

@@ -50,7 +50,7 @@ defmodule MusicLibrary.Records do
   defmacro order_alphabetically do
     quote do
       fragment(
-        "unaccent(json_extract(artists, '$[0].sort_name')) COLLATE NOCASE ASC, unaccent(title) COLLATE NOCASE ASC"
+        "unaccent(artists ->> '$[0].sort_name') COLLATE NOCASE ASC, unaccent(title) COLLATE NOCASE ASC"
       )
     end
   end