Search v1 (#19)

* Adds description to media items; hooks it up to indexing/media downloading

* Added a search method using postgres fulltext search

* Hooked up search functionality to the search form

* Added persistence to the search form when on search page

priv/repo/migrations/20240210045410_add_description_to_media_items.exs

@@ -0,0 +1,9 @@
+defmodule Pinchflat.Repo.Migrations.AddDescriptionToMediaItems do
+  use Ecto.Migration
+
+  def change do
+    alter table(:media_items) do
+      add :description, :text
+    end
+  end
+end

priv/repo/migrations/20240210051038_add_search_field_to_media_items.exs

@@ -0,0 +1,28 @@
+defmodule Pinchflat.Repo.Migrations.AddSearchFieldToMediaItems do
+  use Ecto.Migration
+
+  def up do
+    execute """
+      ALTER TABLE media_items
+        ADD COLUMN searchable tsvector
+        GENERATED ALWAYS AS (
+          setweight(to_tsvector('english', coalesce(title, '')), 'A') ||
+          setweight(to_tsvector('english', coalesce(description, '')), 'B')
+        ) STORED;
+    """
+
+    execute """
+      CREATE INDEX media_items_searchable_idx ON media_items USING gin(searchable);
+    """
+  end
+
+  def down do
+    execute """
+      DROP INDEX media_items_searchable_idx;
+    """
+
+    alter table(:media_items) do
+      remove :searchable
+    end
+  end
+end