Получение ошибки StackLevel при сохранении хештегов в приложении Rails

Question

У меня есть приложение Rails, которое позволяет добавлять хэштеги к разному контенту. Я получаю слишком глубокую ошибку уровня стека при попытке сохранить запись с хэштегом.

ошибка

            Failure/Error: hashtag = Hashtag.find_by(name: hashtag_name)
      
      SystemStackError:
        stack level too deep
      # ./app/models/concerns/hashtaggable_item.rb:28:in `block in parse_hashtags'
      # ./app/models/concerns/hashtaggable_item.rb:27:in `each'
      # ./app/models/concerns/hashtaggable_item.rb:27:in `parse_hashtags'
      # ./app/models/concerns/hashtaggable_item.rb:42:in `update_display_body'
      # ./app/models/concerns/hashtaggable_item.rb:42:in `update_display_body'
      # ./app/models/concerns/hashtaggable_item.rb:42:in `update_display_body'

параметры

      {
  "action": "create",
  "commit": "Post",
  "controller": "discussions",
  "discussion": {
    "body": "Thank go it's #Friday",
    "state_id": "35"
  }
}

приложение / модели / проблемы / hashtaggable_item.erb

      module HashtaggableItem
  extend ActiveSupport::Concern

  included do
    # View Helpers
    require 'link_thumbnailer'
    include ActionView::Helpers
    attr_accessor :output_buffer

    include Twitter::TwitterText::Autolink
    include Twitter::TwitterText::Extractor

    # Relationships
    has_many :hashtaggable_hashtags, as: :hashtaggable, dependent: :destroy_async
    has_many :hashtags, through: :hashtaggable_hashtags

    belongs_to :shared_link, optional: true

    # Callbacks
    after_create  :parse_hashtags
    before_update :parse_hashtags
    after_save    :update_display_body

  private

    def parse_hashtags
      extract_hashtags(body).uniq.each do |hashtag_name|
        hashtag = Hashtag.find_by(name: hashtag_name)
        hashtags << (hashtag || Hashtag.create(name: hashtag_name)) unless hashtags.include? hashtag
      end
    end

    def update_display_body
      d_body = strip_tags(body)
      d_body = auto_link(d_body, $TWITTER_TEXT_CONFIG)

      if url = extract_urls(body).first
        link = SharedLink.where(url: url).first_or_create(link_attributes(url))
        update(shared_link_id: link.id)
      end

      update(display_body: sanitize(d_body))
    end

    def link_attributes(url)
      lt = LinkThumbnailer.generate(url)
      { url: url, title: lt.title, description: lt.description, img_src: lt.images.first.try(:src) }
    end
  end
end

приложение / модели / обсуждение.rb

      class Discussion < Content
  default_scope -> { where(content_type: :discussion) }
end

приложение / модели / content.rb

      class Content < ApplicationRecord
  include HashtaggableItem
  include PgSearch::Model

  searchkick word_start: %i[body title state state_slug user], callbacks: :async

  def search_data
    {
      upvotes_count: upvotes_count,
      body: body,
      title: title,
      state: state_name,
      state_slug: state_slug,
      user: user_full_name,
      created_at: created_at,
      updated_at: updated_at
    }
  end

  acts_as_paranoid

  belongs_to :user
  delegate :full_name, to: :user, allow_nil: true
  belongs_to :politician, optional: true, class_name: 'LegiscanModel::Politician'
  belongs_to :shared_link, optional: true
  belongs_to :state, class_name: 'LegiscanModel::State', foreign_key: :legiscan_model_state_id
  delegate :name, :abbr, :slug, to: :state, prefix: true, allow_nil: true
  has_many :upvotes, as: :upvotable, dependent: :destroy_async, counter_cache: true
  has_many :comments, as: :commentable, dependent: :destroy_async, counter_cache: true

  validates :body, presence: true

  enum content_type: { question: 0, discussion: 1, bill: 2 }
  delegate :display_name, :full_name, :title, to: :user, prefix: true
end

приложение / контроллеры / обсуждения_controller.rb

        def create
    respond_to do |format|
      format.js do
        @discussion.user = current_user
        # byebug
        @discussion.save!
        render body: html_content, status: :ok
      end
    end
  end