       { featured_artist_ids: ObjectId(input.artist_id) }
     ] if input.artist_id
     query.featured_artwork_ids = ObjectId input.artwork_id if input.artwork_id
-    callback null, query
+    callback null, query, limit, offset
 
 @find = (id, callback) ->
   query = if ObjectId.isValid(id) then { _id: ObjectId(id) } else { slugs: id }

# Retrieval
#
@where = (input, callback) ->
  toQuery input, (err, query) ->
    return callback err if err
    { limit, offset } = input
    cursor = db.articles.find(query).skip(offset or 0)
    async.parallel [
      (cb) -> db.articles.count cb

toQuery = (input, callback) ->
  Joi.validate input, querySchema, (err, input) ->
    return callback err if err
    { limit, offset } = input
    query = _.omit input, 'limit', 'offset', 'artist_id', 'artwork_id'
    query.author_id = ObjectId input.author_id if input.author_id
    query.$or = [
