Find MVW from children.

app/controllers/catalog_controller.rb

@@ -2,6 +2,7 @@
 # Simplified catalog controller
 class CatalogController < ApplicationController
   include Blacklight::Catalog
+  self.search_params_logic += [:hide_parented_resources, :join_from_parent]
 
   configure_blacklight do |config|
     config.show.oembed_field = :oembed_url_ssm

app/models/search_builder.rb

@@ -2,4 +2,13 @@ class SearchBuilder < Blacklight::SearchBuilder
   include Blacklight::Solr::SearchBuilderBehavior
 
   include Spotlight::Catalog::AccessControlsEnforcement::SearchBuilder
+
+  def hide_parented_resources(solr_params)
+    solr_params[:fq] ||= []
+    solr_params[:fq] << "!#{Spotlight::Resources::Iiif::Engine.config.collection_id_field}:['' TO *]"
+  end
+
+  def join_from_parent(solr_params)
+    solr_params[:q] = JoinChildrenQuery.new(solr_params[:q]).to_s
+  end
 end

app/models/search_builder/join_children_query.rb

@@ -0,0 +1,35 @@
+class SearchBuilder
+  class JoinChildrenQuery
+    attr_reader :parent_query
+    def initialize(parent_query)
+      @parent_query = parent_query
+    end
+
+    def to_s
+      queries.map do |query|
+        "(#{dismax_join(send(query))})"
+      end.join(" OR ")
+    end
+
+    private
+
+      def queries
+        [
+          :main_query,
+          :query_children
+        ]
+      end
+
+      def dismax_join(query)
+        "#{query}{!dismax}#{parent_query}"
+      end
+
+      def main_query
+        ""
+      end
+
+      def query_children
+        "{!join from=collection_id_ssim to=id}"
+      end
+  end
+end

spec/controllers/catalog_controller_spec.rb

@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+RSpec.describe CatalogController do
+  context "with mvw", vcr: { cassette_name: 'mvw' } do
+    let(:url) { "https://hydra-dev.princeton.edu/concern/multi_volume_works/f4752g76q/manifest" }
+    it "hides scanned resources with parents" do
+      exhibit = Spotlight::Exhibit.create title: 'Exhibit A'
+      resource = IIIFResource.new manifest_url: url, exhibit: exhibit
+      expect(resource.save_and_index).to be_truthy
+
+      get :index, q: "", exhibit_id: exhibit.id
+
+      expect(document_ids).to eq [resource.to_solr.to_a.first[:id]]
+    end
+    it "returns MVW from metadata found in volume" do
+      exhibit = Spotlight::Exhibit.create title: 'Exhibit A'
+      resource = IIIFResource.new manifest_url: url, exhibit: exhibit
+      expect(resource.save_and_index).to be_truthy
+
+      get :index, q: "SR1", exhibit_id: exhibit.id
+
+      expect(document_ids).to eq [resource.to_solr.to_a.first[:id]]
+    end
+  end
+
+  def document_ids
+    assigns[:document_list].map do |x|
+      x["id"]
+    end
+  end
+end