lib/mako/feed_constructor.rb
def entry_summary(entry)
      !entry.content || entry.content.empty? ? entry.summary : entry.content
    end
def entry_summary(entry)
      !entry.content || entry.content.empty? ? entry.summary : entry.content
    end
Some feeds use summary for the full article body, other feeds use content.
 This prefers content, but falls back to summary.

 @param [Feedjira::Feed]
 @return [String] an HTML string of the source article body