Extended the resource import functionality to use ExternalSync for remote and local ID mapping and lookup instead of attribute based relation.

lib/import/base_resource.rb

@@ -10,6 +10,14 @@ module Import
       raise "#{self.class.name} has no implmentation of the needed 'import_class' method"
     end
 
+    def source
+      raise "#{self.class.name} has no implmentation of the needed 'source' method"
+    end
+
+    def remote_id(resource)
+      @remote_id ||= resource.delete(:id)
+    end
+
     private
 
     def import(resource)
@@ -33,12 +41,27 @@ module Import
     end
 
     def lookup_existing(resource)
-      import_class.find_by(name: resource[:name])
+
+      instance = ExternalSync.find_by(
+        source:    source,
+        source_id: remote_id(resource),
+        object:    import_class.name,
+      )
+      return if !instance
+      import_class.find_by(id: instance.o_id)
     end
 
     def create(resource)
       @resource = import_class.new(resource)
       @resource.save
+
+      ExternalSync.create(
+        source:    source,
+        source_id: remote_id(resource),
+        object:    import_class.name,
+        o_id:      @resource.id
+      )
+
       post_create(
         instance:   @resource,
         attributes: resource
@@ -55,7 +78,7 @@ module Import
     def map(resource)
       mapped     = from_mapping(resource)
       attributes = defaults(resource).merge(mapped)
-      attributes.deep_symbolize_keys
+      attributes.symbolize_keys
     end
 
     def from_mapping(resource)

spec/import/model_resource_spec.rb

@@ -6,15 +6,17 @@ RSpec.describe Import::ModelResource do
     module Import
       module Test
         class Group < Import::ModelResource
+          def source
+            'RSpec-Test'
+          end
         end
       end
     end
   end
 
+  let(:group_data) { attributes_for(:group).merge(id: 1337) }
+
   it 'creates model Objects by class name' do
-
-    group_data = attributes_for(:group)
-
     expect {
       Import::Test::Group.new(group_data)
     }.to change { Group.count }.by(1)
@@ -22,14 +24,21 @@ RSpec.describe Import::ModelResource do
 
   it 'updates model Objects by class name' do
 
-    group = create(:group)
+    expect do
+      Import::Test::Group.new(group_data)
+    end
+      .to change {
+            Group.count
+          }.by(1)
 
-    update_attributes        = group.serializable_hash
+    expect do
-    update_attributes[:note] = 'Updated'
+      Import::Test::Group.new(group_data.merge(note: 'Updated'))
-
+    end
-    expect {
+      .to change {
-      Import::Test::Group.new(update_attributes)
+            Group.count
-      group.reload
+          }.by(0)
-    }.to change { group.note }
+      .and change {
+             Group.last.note
+           }
   end
 end