Queries for Arg Block report

arg-block.rb

# Start with a list of endpoints; here we just use all of them
endpoints = Run.where("remote_endpoint IS NOT NULL").map &:remote_endpoint

select_params = [
  {
    :embeddable_type => "Embeddable::OpenResponse",
    :embeddable_table => "embeddable_open_responses",
    :answer_table => "embeddable_open_response_answers",
    :question_foreign_key => "open_response_id",
    :feedback_table => "c_rater_feedback_items",
    :usefulness_score_column => "c_rater_feedback_submissions.usefulness_score",
    :usefulness_score_join => "LEFT OUTER JOIN c_rater_feedback_submissions ON c_rater_feedback_submissions.id = c_rater_feedback_items.feedback_submission_id"
  },
  {
    :embeddable_type => "Embeddable::MultipleChoice",
    :embeddable_table => "embeddable_multiple_choices",
    :answer_table => "embeddable_multiple_choice_answers",
    :question_foreign_key => "multiple_choice_id",
    :feedback_table => "embeddable_feedback_items",
    :usefulness_score_column => "NULL",
    :usefulness_score_join => ""
  }
]

selects = select_params.map do |s|
  select = <<SQL
    SELECT DISTINCT
    runs.remote_endpoint AS remote_endpoint,
    lightweight_activities.id AS activity_id,
    interactive_pages.id AS page_id,
    interactive_pages.position AS page_index,
    page_items.position AS question_index,
    #{s[:embeddable_table]}.id AS question_id,
    #{s[:embeddable_table]}.prompt AS prompt,
    #{s[:feedback_table]}.answer_text AS answer,
    #{s[:feedback_table]}.score AS score,
    #{s[:feedback_table]}.created_at AS submit_time,
    #{s[:feedback_table]}.feedback_text AS feedback,
    #{s[:usefulness_score_column]} AS usefulness_score
  FROM runs
    INNER JOIN lightweight_activities
      ON lightweight_activities.id = runs.activity_id
    INNER JOIN interactive_pages
      ON interactive_pages.lightweight_activity_id = lightweight_activities.id
    INNER JOIN page_items
      ON page_items.interactive_page_id = interactive_pages.id
    INNER JOIN #{s[:embeddable_table]}
      ON #{s[:embeddable_table]}.id = page_items.embeddable_id
    LEFT OUTER JOIN #{s[:answer_table]}
      ON #{s[:answer_table]}.run_id = runs.id AND #{s[:answer_table]}.#{s[:question_foreign_key]} = #{s[:embeddable_table]}.id
    LEFT OUTER JOIN #{s[:feedback_table]}
      ON #{s[:feedback_table]}.answer_id = #{s[:answer_table]}.id
    #{s[:usefulness_score_join]}
  WHERE
    page_items.section = "arg_block"
    AND
    embeddable_type = "#{s[:embeddable_type]}"
    AND
    remote_endpoint in ("#{endpoints.join('","')}")
SQL
end

order_by = <<SQL
  ORDER BY
    activity_id,
    page_index,
    question_index
SQL

sql = selects.join("\n UNION\n") + order_by + ";"

results = ActiveRecord::Base.connection.execute(sql)
exp = ActiveRecord::Base.connection.explain(sql)