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class PostTagLink < Active::Base
  belongs_to :post
  belongs_to :tag
end

class CreatePostTagLinkTable < ActiveRecord::Migration[6.0]
  def change
    create_table :post_tag_links do |t|
      t.references :post, foreign_key: true, index: true
      t.references :tag, foreign_key: true, index: true
    end
  end
end

class Tag < ActiveRecord::Base
  belongs_to :post
  validates_presence_of :name
end

class CreateTagTable < ActiveRecord::Migration[6.0]
  def change
    create_table :tags do |t|
      t.string :name, null: false
    end
  end
end