```ruby
class Hashtag < ActiveRecord::Base
	validates :title, uniqueness: true 

	has_many :hashtag_questions
	has_many :questions, through: :hashtag_questions

end
```

Make Tagize Method Far Hashtags
user
```ruby
class Hashtag < ActiveRecord::Base
	validates :title, uniqueness: true 

	has_many :hashtag_questions
	has_many :questions, through: :hashtag_questions

	before_save :tagize


	private 
	def tagize
		title.downcase!.gsub!(" ", "-")
	end 
end
```
assistant