Add join table - populate with data

db/migrate/20240509194515_create_episode_feeds.rb

@@ -0,0 +1,41 @@
+class CreateEpisodeFeeds < ActiveRecord::Migration[7.0]
+  include TextSanitizer
+
+  def up
+    create_table :episodes_feeds, id: false do |t|
+      t.belongs_to :episode
+      t.belongs_to :feed
+    end
+
+    Feed.includes(:podcast).find_each do |f|
+      sql = <<-SQL.squish
+        INSERT INTO episodes_feeds
+        SELECT id AS episode_id, #{f.id} AS feed_id
+        FROM episodes
+        WHERE deleted_at IS NULL AND podcast_id = #{f.podcast_id}
+      SQL
+
+      if f.include_tags.present?
+        kws = f.sanitize_keywords(f.include_tags, true)
+        ids = f.podcast.episodes.filter_map do |e|
+          e.id if (sanitize_keywords(e.categories, true) & kws).any?
+        end
+        sql << " AND episodes.id IN (#{ids.concat([0]).join(",")})"
+      end
+
+      if f.exclude_tags.present?
+        kws = f.sanitize_keywords(f.exclude_tags, true)
+        ids = f.podcast.episodes.filter_map do |e|
+          e.id if (sanitize_keywords(e.categories, true) & kws).any?
+        end
+        sql << " AND episodes.id NOT IN (#{ids.join(",")})" if ids.any?
+      end
+
+      Feed.connection.execute(sql)
+    end
+  end
+
+  def down
+    drop_table :episodes_feeds
+  end
+end