Remove collection size feature

While looking into #4100, we noticed that `CharacterizeJob` not only saves a file set's `original_file`, but also reindexes the file set, *and* reindexes every collection to which the file set's work belongs. It appears that this feature was added way back in the Sufia days in order to support the use case of displaying on the collection show page the total size of all files uploaded to a collection's works.

Why is this problematic?

At large scale, this means touching a potentially huge portion of the repository—iterating over all files in all works in a collection—in order to display an arguably useful string to a subset of repository users who care about such information. Doing this in `CharacterizeJob` introduces significant potential delay in the ingest pipeline, increasing how long it takes for a deposit to finish and render in the Hyrax UI (e.g., by delaying the creation of derivatives).

We propose removing this feature for now and encourage folks who need this feature to contribute it back with a better-performing, more streamlined design.

app/indexers/hyrax/collection_indexer.rb

@@ -12,8 +12,6 @@ def generate_solr_document
       super.tap do |solr_doc|
         # Makes Collections show under the "Collections" tab
         solr_doc['generic_type_sim'] = ["Collection"]
-        # Index the size of the collection in bytes
-        solr_doc['bytes_lts'] = object.bytes
         solr_doc['visibility_ssi'] = object.visibility
 
         object.in_collections.each do |col|

app/jobs/characterize_job.rb

@@ -21,7 +21,6 @@ def characterize(file_set, _file_id, filepath)
       file_set.characterization_proxy.alpha_channels = channels(filepath) if file_set.image? && Hyrax.config.iiif_image_server?
       file_set.characterization_proxy.save!
       file_set.update_index
-      file_set.parent&.in_collections&.each(&:update_index)
     end
 
     def channels(filepath)

app/models/concerns/hyrax/collection_behavior.rb

@@ -111,20 +111,6 @@ def collection_type_gid_document_field_name
       end
     end
 
-    # Compute the sum of each file in the collection using Solr to
-    # avoid having to access Fedora
-    #
-    # @return [Fixnum] size of collection in bytes
-    # @raise [RuntimeError] unsaved record does not exist in solr
-    def bytes
-      return 0 if member_object_ids.empty?
-
-      raise "Collection must be saved to query for bytes" if new_record?
-
-      # One query per member_id because Solr is not a relational database
-      member_object_ids.collect { |work_id| size_for_work(work_id) }.sum
-    end
-
     # @api public
     # Retrieve the permission template for this collection.
     # @return [Hyrax::PermissionTemplate]
@@ -169,22 +155,6 @@ def visibility_group
         []
       end
 
-      # Calculate the size of all the files in the work
-      # @param work_id [String] identifer for a work
-      # @return [Integer] the size in bytes
-      def size_for_work(work_id)
-        argz = { fl: "id, #{file_size_field}",
-                 fq: "{!join from=#{member_ids_field} to=id}id:#{work_id}" }
-        files = ::FileSet.search_with_conditions({}, argz)
-        files.reduce(0) { |sum, f| sum + f[file_size_field].to_i }
-      end
-
-      # Field name to look up when locating the size of each file in Solr.
-      # Override for your own installation if using something different
-      def file_size_field
-        "file_size_lts"
-      end
-
       # Solr field name works use to index member ids
       def member_ids_field
         "member_ids_ssim"

app/presenters/hyrax/collection_presenter.rb

@@ -41,7 +41,7 @@ def collection_type
     # Terms is the list of fields displayed by
     # app/views/collections/_show_descriptions.html.erb
     def self.terms
-      [:total_items, :size, :resource_type, :creator, :contributor, :keyword, :license, :publisher, :date_created, :subject,
+      [:total_items, :resource_type, :creator, :contributor, :keyword, :license, :publisher, :date_created, :subject,
        :language, :identifier, :based_near, :related_url]
     end
 
@@ -51,19 +51,13 @@ def terms_with_values
 
     def [](key)
       case key
-      when :size
-        size
       when :total_items
         total_items
       else
         solr_document.send key
       end
     end
 
-    def size
-      number_to_human_size(@solr_document['bytes_lts'])
-    end
-
     def total_items
       ActiveFedora::Base.where("member_of_collection_ids_ssim:#{id}").count
     end

spec/indexers/hyrax/collection_indexer_spec.rb

@@ -10,7 +10,6 @@
   let(:doc) do
     {
       'generic_type_sim' => ['Collection'],
-      'bytes_lts' => 1000,
       'thumbnail_path_ss' => '/downloads/1234?file=thumbnail',
       'member_of_collection_ids_ssim' => [col1id, col2id],
       'member_of_collections_ssim' => [col1title, col2title],
@@ -20,7 +19,6 @@
 
   describe "#generate_solr_document" do
     before do
-      allow(collection).to receive(:bytes).and_return(1000)
       allow(collection).to receive(:in_collections).and_return([col1, col2])
       allow(Hyrax::ThumbnailPathService).to receive(:call).and_return("/downloads/1234?file=thumbnail")
     end

spec/jobs/characterize_job_spec.rb

@@ -49,18 +49,4 @@
       expect { described_class.perform_now(file_set, file.id) }.to raise_error(StandardError, /original_file was not found/)
     end
   end
-
-  context "when the file set's work is in a collection" do
-    let(:work)       { build(:generic_work) }
-    let(:collection) { build(:collection_lw) }
-
-    before do
-      allow(file_set).to receive(:parent).and_return(work)
-      allow(work).to receive(:in_collections).and_return([collection])
-    end
-    it "reindexes the collection" do
-      expect(collection).to receive(:update_index)
-      described_class.perform_now(file_set, file.id)
-    end
-  end
 end

spec/presenters/hyrax/collection_presenter_spec.rb

@@ -3,7 +3,7 @@
     subject { described_class.terms }
 
     it do
-      is_expected.to eq [:total_items, :size, :resource_type, :creator,
+      is_expected.to eq [:total_items, :resource_type, :creator,
                          :contributor, :keyword, :license, :publisher,
                          :date_created, :subject, :language, :identifier,
                          :based_near, :related_url]
@@ -25,9 +25,6 @@
   let(:presenter) { described_class.new(solr_doc, ability) }
   let(:solr_doc) { SolrDocument.new(collection.to_solr) }
 
-  # Mock bytes so collection does not have to be saved.
-  before { allow(collection).to receive(:bytes).and_return(0) }
-
   describe "collection type methods" do
     subject { presenter }
 
@@ -81,7 +78,6 @@
 
     it do
       is_expected.to eq [:total_items,
-                         :size,
                          :resource_type,
                          :keyword,
                          :date_created,
@@ -126,12 +122,6 @@
     it { is_expected.to eq ['adc12v'] }
   end
 
-  describe "#size", :clean_repo do
-    subject { presenter.size }
-
-    it { is_expected.to eq '0 Bytes' }
-  end
-
   describe "#total_items", :clean_repo do
     subject { presenter.total_items }
 
@@ -284,12 +274,6 @@
     end
   end
 
-  describe "#size", :clean_repo do
-    subject { presenter.size }
-
-    it { is_expected.to eq '0 Bytes' }
-  end
-
   describe "#parent_collection_count" do
     subject { presenter.parent_collection_count }