Persisters should error if you try to save something which is gone now, but used to be persisted.

lib/valkyrie/persistence/fedora/persister.rb

@@ -13,7 +13,7 @@ def initialize(adapter:)
     end
 
     # (see Valkyrie::Persistence::Memory::Persister#save)
-    def save(resource:)
+    def save(resource:, external_resource: false)
       initialize_repository
       internal_resource = resource.dup
       internal_resource.created_at ||= Time.current

lib/valkyrie/persistence/memory/persister.rb

@@ -16,12 +16,15 @@ def initialize(adapter)
 
     # Save a single resource.
     # @param resource [Valkyrie::Resource] The resource to save.
+    # @param external_resource [Boolean] Whether the resource to be saved comes
+    #   from a different metadata store. Allows a resource to be saved even if
+    #   it's not already in the store.
     # @return [Valkyrie::Resource] The resource with an `#id` value generated by the
     #   persistence backend.
     # @raise [Valkyrie::Persistence::StaleObjectError]
-    def save(resource:)
+    def save(resource:, external_resource: false)
       raise Valkyrie::Persistence::StaleObjectError, "The object #{resource.id} has been updated by another process." unless valid_lock?(resource)
-      raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." unless valid_for_save?(resource)
+      raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." unless external_resource || valid_for_save?(resource)
 
       # duplicate the resource so we are not creating side effects on the caller's resource
       internal_resource = resource.dup

lib/valkyrie/persistence/postgres/persister.rb

@@ -17,10 +17,10 @@ def initialize(adapter:)
     # @return [Valkyrie::Resource] the persisted/updated resource
     # @raise [Valkyrie::Persistence::StaleObjectError] raised if the resource
     #   was modified in the database between been read into memory and persisted
-    def save(resource:)
+    def save(resource:, external_resource: false)
       orm_object = resource_factory.from_resource(resource: resource)
       orm_object.transaction do
-        raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." if resource.persisted? && !orm_object.persisted?
+        raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." if !external_resource && resource.persisted? && !orm_object.persisted?
         orm_object.save!
         if resource.id && resource.id.to_s != orm_object.id
           raise Valkyrie::Persistence::UnsupportedDatatype,

lib/valkyrie/persistence/solr/persister.rb

@@ -16,11 +16,11 @@ def initialize(adapter:)
 
     # (see Valkyrie::Persistence::Memory::Persister#save)
     # @return [Boolean] If write_only, whether saving succeeded.
-    def save(resource:)
-      raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." unless write_only? || valid_for_save?(resource)
+    def save(resource:, external_resource: false)
       if write_only?
         repository([resource]).persist
       else
+        raise Valkyrie::Persistence::ObjectNotFoundError, "The object #{resource.id} is previously persisted but not found at save time." unless external_resource || valid_for_save?(resource)
         repository([resource]).persist.first
       end
     end

lib/valkyrie/specs/shared_specs/persister.rb

@@ -60,6 +60,12 @@ class CustomResource < Valkyrie::Resource
 
       expect { persister.save(resource: saved) }.to raise_error(Valkyrie::Persistence::ObjectNotFoundError)
     end
+    it "is okay if it's from another persister" do
+      memory_adapter = Valkyrie::Persistence::Memory::MetadataAdapter.new
+      saved = memory_adapter.persister.save(resource: resource)
+
+      expect { persister.save(resource: saved, external_resource: true) }.not_to raise_error
+    end
   end
 
   it "can persist single values" do