♻️ Extract Bulkrax::FactoryClassFinder

This refactor introduces consolidating logic for determining an entry's
factory_class.

The goal is to begin to allow for us to have a CSV record that says
"model = Work" and to use a "WorkResource".

Note, there are downstream implementations that overwrite
`factory_class` and we'll need to consider how we approach that.

app/models/bulkrax/csv_collection_entry.rb

@@ -2,9 +2,7 @@
 
 module Bulkrax
   class CsvCollectionEntry < CsvEntry
-    def factory_class
-      Collection
-    end
+    self.default_work_type = "Collection"
 
     # Use identifier set by CsvParser#unique_collection_identifier, which falls back
     # on the Collection's first title if record[source_identifier] is not present

app/models/bulkrax/entry.rb

@@ -8,6 +8,8 @@ class OAIError < RuntimeError; end
   class Entry < ApplicationRecord
     include Bulkrax::HasMatchers
     include Bulkrax::ImportBehavior
+    self.class_attribute :default_work_type, default: Bulkrax.default_work_type
+
     include Bulkrax::ExportBehavior
     include Bulkrax::StatusInfo
     include Bulkrax::HasLocalProcessing

app/models/bulkrax/oai_set_entry.rb

@@ -2,9 +2,7 @@
 
 module Bulkrax
   class OaiSetEntry < OaiEntry
-    def factory_class
-      Collection
-    end
+    self.default_work_type = "Collection"
 
     def build_metadata
       self.parsed_metadata = self.raw_metadata

app/models/bulkrax/rdf_collection_entry.rb

@@ -2,6 +2,7 @@
 
 module Bulkrax
   class RdfCollectionEntry < RdfEntry
+    self.default_work_type = "Collection"
     def record
       @record ||= self.raw_metadata
     end
@@ -11,9 +12,5 @@ def build_metadata
       add_local
       return self.parsed_metadata
     end
-
-    def factory_class
-      Collection
-    end
   end
 end

app/models/concerns/bulkrax/file_set_entry_behavior.rb

@@ -2,8 +2,10 @@
 
 module Bulkrax
   module FileSetEntryBehavior
-    def factory_class
-      ::FileSet
+    extend ActiveSupport::Concern
+
+    included do
+      self.default_work_type = "::FileSet"
     end
 
     def file_reference

app/models/concerns/bulkrax/import_behavior.rb

@@ -189,22 +189,10 @@ def factory
     end
 
     def factory_class
-      fc = if self.parsed_metadata&.[]('model').present?
-             self.parsed_metadata&.[]('model').is_a?(Array) ? self.parsed_metadata&.[]('model')&.first : self.parsed_metadata&.[]('model')
-           elsif self.mapping&.[]('work_type').present?
-             self.parsed_metadata&.[]('work_type').is_a?(Array) ? self.parsed_metadata&.[]('work_type')&.first : self.parsed_metadata&.[]('work_type')
-           else
-             Bulkrax.default_work_type
-           end
-
-      # return the name of the collection or work
-      fc.tr!(' ', '_')
-      fc.downcase! if fc.match?(/[-_]/)
-      fc.camelcase.constantize
-    rescue NameError
-      nil
-    rescue
-      Bulkrax.default_work_type.constantize
+      # ATTENTION: Do not memoize this here; tests should catch the problem, but through out the
+      # lifecycle of parsing a CSV row or what not, we end up having different factory classes based
+      # on the encountered metadata.
+      FactoryClassFinder.find(entry: self)
     end
   end
 end

app/services/bulkrax/factory_class_finder.rb

@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+module Bulkrax
+  class FactoryClassFinder
+    ##
+    # @param entry [Bulkrax::Entry]
+    # @return [Class]
+    def self.find(entry:)
+      new(entry: entry).find
+    end
+
+    def initialize(entry:)
+      @entry = entry
+    end
+    attr_reader :entry
+
+    ##
+    # @return [Class] when we are able to derive the class based on the {#name}.
+    # @return [Nil] when we encounter errors with constantizing the {#name}.
+    # @see #name
+    def find
+      # TODO: We have a string, now we want to consider how we coerce.  Let's say we have Work and
+      # WorkResource in our upstream application.  Work extends ActiveFedora::Base and is legacy.
+      # And WorkResource extends Valkyrie::Resource and is where we want to be moving.  We may want
+      # to coerce the "Work" name into "WorkResource"
+      name.constantize
+    rescue NameError
+      nil
+    rescue
+      entry.default_work_type.constantize
+    end
+
+    ##
+    # @api private
+    # @return [String]
+    def name
+      fc = if entry.parsed_metadata&.[]('model').present?
+             Array.wrap(entry.parsed_metadata['model']).first
+           elsif entry.importerexporter&.mapping&.[]('work_type').present?
+             # Because of delegation's nil guard, we're reaching rather far into the implementation
+             # details.
+             Array.wrap(entry.parsed_metadata['work_type']).first
+           else
+             # The string might be frozen, so lets duplicate
+             entry.default_work_type.dup
+           end
+
+      # Let's coerce this into the right shape.
+      fc.tr!(' ', '_')
+      fc.downcase! if fc.match?(/[-_]/)
+      fc.camelcase
+    rescue
+      entry.default_work_type
+    end
+  end
+end

lib/bulkrax.rb

@@ -40,8 +40,6 @@ class Configuration
     attr_accessor :fill_in_blank_source_identifiers
 
     ##
-    # Configure which persistence adapter you'd prefer to favor.
-    #
     # @param adapter [Class<Bulkrax::PersistenceLayer::AbstractAdapter>]
     attr_writer :persistence_adapter
 

spec/models/bulkrax/csv_file_set_entry_spec.rb

@@ -6,6 +6,11 @@ module Bulkrax
   RSpec.describe CsvFileSetEntry, type: :model do
     subject(:entry) { described_class.new }
 
+    describe '#default_work_type' do
+      subject { entry.default_work_type }
+      it { is_expected.to eq("::FileSet") }
+    end
+
     describe '#file_reference' do
       context 'when parsed_metadata includes the "file" property' do
         before do

spec/models/bulkrax/rdf_file_set_entry_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+module Bulkrax
+  RSpec.describe RdfFileSetEntry, type: :model do
+    describe '#default_work_type' do
+      subject { described_class.new.default_work_type }
+      it { is_expected.to eq("::FileSet") }
+    end
+
+    describe '#factory_class' do
+      subject { described_class.new.factory_class }
+      it { is_expected.to eq(::FileSet) }
+    end
+  end
+end

spec/spec_helper.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'dry/monads'
+
 # This file was generated by the `rails generate rspec:install` command. Conventionally, all
 # specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
 # The generated `.rspec` file contains `--require spec_helper` which will cause