Support importing compound metadata

app/models/concerns/bulkrax/has_matchers.rb

@@ -95,7 +95,20 @@ def set_parsed_data(name, value)
     def set_parsed_object_data(object_multiple, object_name, name, index, value)
       target_key = parsed_object_target_key(object_name)
       target = object_target_for(target_key, object_name, object_multiple, index)
-      assign_object_value(target, name, value)
+      assign_object_value(target, object_row_key(name), value)
+    end
+
+    # The key a value is written under inside an `object:` row. Defaults to the
+    # mapping key, but a mapping may set `name:` (alias `row_key:`) to use a
+    # different in-row key. This lets two mappings with distinct (globally
+    # unique) keys both write the same in-row key into different objects — e.g.
+    # a `title` sub-property shared by two compounds, each needing a unique
+    # top-level mapping key but the same `title` key inside its row.
+    def object_row_key(name)
+      cfg = mapping[name]
+      return name unless cfg.is_a?(Hash)
+
+      cfg['name'] || cfg[:name] || cfg['row_key'] || cfg[:row_key] || name
     end
 
     # Resolve the hash slot that `name` should be written into, initializing

spec/models/bulkrax/csv_entry_spec.rb

@@ -670,6 +670,47 @@ class ::Avocado < Work
         end
       end
 
+      # Compound metadata is a Valkyrie-only feature: the in-row `name:` option
+      # supports compounds whose sub-property keys collide across parents
+      # (e.g. a `title` shared by two compounds). Exercise it against a Valkyrie
+      # resource whose schema declares `type: hash, multiple: true` parents.
+      context 'when a mapping declares name: to set the in-row key (Valkyrie compound)' do
+        # `name:` (alias `row_key:`) decouples the in-row key from the globally
+        # unique mapping key, so two mappings with distinct keys can write the
+        # same in-row key into different compounds.
+        let(:importer) do
+          FactoryBot.create(:bulkrax_importer_csv, field_mapping: {
+                              'compound_one_title' => { from: ['compound_one_title'], object: 'compound_one', nested_attributes: true, name: 'title' },
+                              'compound_two_title' => { from: ['compound_two_title'], object: 'compound_two', nested_attributes: true, name: 'title' }
+                            })
+        end
+
+        around do |example|
+          previous = Bulkrax.object_factory
+          Bulkrax.object_factory = Bulkrax::ValkyrieObjectFactory
+          example.run
+          Bulkrax.object_factory = previous
+        end
+
+        before do
+          allow(subject).to receive(:factory_class).and_return(WorkResource)
+          allow(subject).to receive(:raw_metadata).and_return(
+            'source_identifier' => '2',
+            'title' => 'some title',
+            'compound_one_title_1' => 'Title A',
+            'compound_two_title_1' => 'Title B'
+          )
+        end
+
+        it 'writes each value under the configured in-row key, independently per compound' do
+          metadata = subject.build_metadata
+          expect(metadata['compound_one_attributes']['0']['title']).to eq('Title A')
+          expect(metadata['compound_two_attributes']['0']['title']).to eq('Title B')
+          # The unique mapping key is not used as the in-row key.
+          expect(metadata['compound_one_attributes']['0']).not_to have_key('compound_one_title')
+        end
+      end
+
       context 'with object fields not prefixed and properties with multiple values' do
         let(:importer) do
           FactoryBot.create(:bulkrax_importer_csv, field_mapping: {

spec/test_app/config/metadata/work_resource.yaml

@@ -9,3 +9,12 @@ attributes:
       required: false
       primary: false
       multiple: false
+  # Two compound (Array<Hash>) parents used to exercise the `name:` (row_key)
+  # field-mapping option on a Valkyrie resource: a shared in-row key (`title`)
+  # written into different compounds from distinct, globally unique mapping keys.
+  compound_one:
+    type: hash
+    multiple: true
+  compound_two:
+    type: hash
+    multiple: true