app/models/blog.rb


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class Blog < ApplicationRecord
  include Recordable

  acts_as_taggable

  has_many :comments
  belongs_to :user

  has_many_attached :images do |attachable|
    attachable.variant :thumb, resize_to_limit: [300, 300]
  end

  validates :title, presence: true
  validates :body, presence: true, if: :published
  validates :slug, presence: true, format: /\A[-a-z0-9]+\z/, if: :published
  validates :user, presence: true
  validates :images, content_type: ['image/png', 'image/jpeg']

  before_validation :set_draft_title
  before_save :set_published_at

  def path
    "/says/#{slug}"
  end

  def taggable
    self
  end

  def has_read_more
    body.include?("<!--MORE-->")
  end

  def short_body
    body[0..(body.index("<!--MORE-->")-1)]
  end

  def to_param
    slug
  end

  def visible_date
    if published
      published_at
    else
      updated_at
    end
  end

  private
    def set_draft_title
      if self.title.blank? and not self.published
        self.title = "Untitled draft"
      end
    end

    def set_published_at
      if self.published
        if self.published_at.blank?
          self.published_at = DateTime.now
        end
      else
        self.published_at = nil
      end
    end
end