     query.show_ids = ObjectId input.show_id if input.show_id
     query.auction_id = ObjectId input.auction_id if input.auction_id
     query.vertical_id = ObjectId input.vertical_id if input.vertical_id
+    query.section_ids = ObjectId input.section_id if input.section_id
     query.biography_for_artist_id = ObjectId input.biography_for_artist_id if input.biography_for_artist_id
 
     query.$or = [

          author_id: ObjectId(article.author_id) if article.author_id
          fair_id: ObjectId(article.fair_id) if article.fair_id
          vertical_id: ObjectId(article.vertical_id) if article.vertical_id
          auction_id: ObjectId(article.auction_id) if article.auction_id
          partner_ids: article.partner_ids.map(ObjectId) if article.partner_ids
          show_ids: article.show_ids.map(ObjectId) if article.show_ids

  limit: @number().max(Number API_MAX).default(Number API_PAGE_SIZE)
  offset: @number()
  vertical_id: @objectId()
  section_id: @objectId()
  artist_id: @objectId()
  artwork_id: @objectId()
  fair_ids: @array()
