add Question

app/models/question.rb

@@ -0,0 +1,55 @@
+# == Schema Information
+#
+# Table name: questions
+#
+#  id              :bigint           not null, primary key
+#  alternatives    :jsonb            not null
+#  authorship      :string
+#  authorship_year :string
+#  bloom_taxonomy  :string
+#  body            :text
+#  check_type      :string
+#  difficulty      :string
+#  explanation     :text
+#  instruction     :text
+#  intention       :text
+#  references      :text
+#  status          :string           default("draft"), not null
+#  support         :text
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  subject_id      :bigint
+#  user_id         :bigint           not null
+#
+# Indexes
+#
+#  index_questions_on_subject_id  (subject_id)
+#  index_questions_on_user_id     (user_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (subject_id => subjects.id)
+#  fk_rails_...  (user_id => users.id)
+#
+class Question < ApplicationRecord
+  extend Enumerize
+
+  belongs_to :user
+  belongs_to :subject, optional: true
+
+  enumerize :status, in: %i[draft waiting_review with_requested_changes approved registered]
+  enumerize :difficulty, in: %i[easy medium hard]
+  enumerize :bloom_taxonomy, in: %i[remember understand apply analyze evaluate create]
+  enumerize :check_type, in: %i[
+    unique_answer
+    incomplete_affirmation
+    multiple_answer
+    negative_focus
+    assertion_and_reason
+    gap
+    interpretation
+    association
+    ordering_or_ranking
+    constant_alternatives
+  ]
+end