Linking Tags Posts many to many

Post Model

  1 class Post < ApplicationRecord
 ...
 ...
 10   def self.find_tag(title, post_id, tag_class = Tag)
 11     tag = tag_class.find(title)
 12
 13     if tag
 14       tag_in_db = tag_class.find_by(name: tag)
 15
 16       if tag_in_db
 17         self.create_posttag(post_id, tag_in_db.id)
 18       else
 19         new_tag = tag_class.create(name: tag)
 20         self.create_posttag(post_id, new_tag.id)
 21       end
 22   end

Tag Model

  1 class Tag < ApplicationRecord
  2   has_many :posts_tags
  3   has_many :posts, through: :posts_tags
  4
  5   def self.find(message)
  6     message.split(' ').each do |word|
  7       return word[1...word.length] if word[0] == '#'
  8     end
  9     return nil
 10   end
 11 end