How can you apply a named scope to Tire search results?

Question

I'm using the Tire gem to integrate Elasticsearch into my app, but it throws an error when I try to apply my named scope to it:

scope :unflagged, -> { where('flags_count < 4') }


def self.search(params)
  tire.search(page: params[:page], per_page: 12) do
        query { string params[:query], default_operator: "AND" } if params[:query].present?   
    sort { by :unflagged } if params[:query].blank?
     end
end

Error:

400 : {"error":"SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[JDdrV2g5RWiePD6SezSHvQ][posts][1]: SearchParseException[[posts][1]: from[-1],size[-1]: Parse Failure [Failed to parse source [{\"sort\":[\"unflagged\"],\"size\":12}]]]; nested: SearchParseException[[posts][1]: from[-1],size[-1]: Parse Failure [No mapping found for [unflagged] in order to sort on]]; }{[JDdrV2g5RWiePD6SezSHvQ][posts][2]: SearchParseException[[posts][2]: from[-1],size[-1]: Parse Failure [Failed to parse source [{\"sort\":[\"unflagged\"],\"size\":12}]]]; nested: SearchParseException[[posts][2]: from[-1],size[-1]: Parse Failure [No mapping found for [unflagged] in order to sort on]]; }{[JDdrV2g5RWiePD6SezSHvQ][posts][0]: SearchParseException[[posts][0]: from[-1],size[-1]: Parse Failure [Failed to parse source [{\"sort\":[\"unflagged\"],\"size\":12}]]]; nested: SearchParseException[[posts][0]: from[-1],size[-1]: Parse Failure [No mapping found for [unflagged] in order to sort on]]; }{[JDdrV2g5RWiePD6SezSHvQ][posts][4]: SearchParseException[[posts][4]: from[-1],size[-1]: Parse Failure [Failed to parse source [{\"sort\":[\"unflagged\"],\"size\":12}]]]; nested: SearchParseException[[posts][4]: from[-1],size[-1]: Parse Failure [No mapping found for [unflagged] in order to sort on]]; }{[JDdrV2g5RWiePD6SezSHvQ][posts][3]: SearchParseException[[posts][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [{\"sort\":[\"unflagged\"],\"size\":12}]]]; nested: SearchParseException[[posts][3]: from[-1],size[-1]: Parse Failure [No mapping found for [unflagged] in order to sort on]]; }]","status":400}

I've seen a couple of similar questions posted on SO, but never with an answer.

Could anyone explain if it's possible to apply a named scope to Tire/Elasticsearch? And if so, how?

Answer 1

I'm not sure this qualifies as an 'answer', but being completely stumped and seeing there were several similar unanswered questions about scopes and Tire on SO, I would recommend anyone else having the same issues to simply use another search client.

My criteria were that it had a free tier production support on Heroku, was relatively easy to implement with good documentation, and supported my existing scopes.

I have gone with Swiftype, which meets all those criteria, providing excellent documentation, a sample app, and a free tier on heroku.