class Post < ActiveRecord::Base
  belongs_to :blog
  belongs_to :user

  has_and_belongs_to_many :tags, join_table: 'tags_posts', :dependent => :destroy
  has_and_belongs_to_many :categories, join_table: 'categories_posts', :dependent => :destroy
  has_many :comments, :dependent => :destroy

  validates :title, presence: true

  def has_tag?(tag_name)
   tags.where(name: tag_name).any?
  end

  def tag_names
    tags.pluck(:name)
  end

  def tag_names=(names)
    self.tags = names.map{ |name| Tag.where(name: name).first }
  end

  def tag_name=(tag_name)
    single_tag = [tag_name]
    self.tag_names = single_tag
  end

  def has_category?(category_name)
   categories.where(name: category_name).any?
  end

  def category_names
    categories.pluck(:name)
  end

  def category_names=(names)
    self.categories = names.map{ |name| Category.where(name: name).first }
  end

  def category_name=(category_name)
      single_category_name = [category_name]
      self.category_names = single_category_name
  end

  def user=(id)
    user = User.find_by(id: id)
    self.user_id = user.id if user
  end

end

class Tag < ActiveRecord::Base
  belongs_to :blog
  validates :name, presence: true, uniqueness: true
end