class CreateDoctrines < ActiveRecord::Migration[6.1]
  def change
    create_table :doctrines do |t|
      t.references :document, null: false, polymorphic: true
      t.text       :content, null: false, default: ""
      t.string     :content_fingerprint, null: false, default: ""

      t.timestamps
    end

    add_index :doctrines, 
              %i[content_fingerprint document_id document_type],
              name: "index_doctrines_uniqueness",
              unique: true
  end
end