```ruby
class FeedSync
  def initialize(feed)
    unless feed.kind_of?(Feed)
      raise ArgumentError, 'Feed instance required'
    end

    @feed = feed
  end

  def run
    entries.each do |e|
      @feed.posts.create(
        title:        e.title,
        author:       e.author,
        url:          e.url,
        published_at: e.published,
        content:      entry_content(e)
      )
    end
  end

  private

  def entries
    result = Feedzirra::Feed.fetch_and_parse(@feed.url)
    result ? result.entries : []
  end

  def entry_content(entry)
    case entry
    when Feedzirra::Parser::ITunesRSSItem
      entry.summary
    else
      entry.content || entry.summary
    end
  end
end```

Check feedzirra response class before running import
user
```ruby
class FeedSync
  def initialize(feed)
    unless feed.kind_of?(Feed)
      raise ArgumentError, 'Feed instance required'
    end

    @feed = feed
  end

  def run
    entries.each do |e|
      @feed.posts.create(
        title:        e.title,
        author:       e.author,
        url:          e.url,
        published_at: e.published,
        content:      entry_content(e)
      )
    end
  end

  private

  def entries
    result = Feedzirra::Feed.fetch_and_parse(@feed.url)
    result.class.name =~ /Feedzirra/ ? result.entries : []
  end

  def entry_content(entry)
    case entry
    when Feedzirra::Parser::ITunesRSSItem
      entry.summary
    else
      entry.content || entry.summary
    end
  end
end```
assistant