diff --git a/oscar_odin/mappings/context.py b/oscar_odin/mappings/context.py
index f92adf3..3933d3f 100644
--- a/oscar_odin/mappings/context.py
+++ b/oscar_odin/mappings/context.py
@@ -274,9 +274,9 @@ def bulk_update_or_create_instances(self, instances):
             self.Model.objects.bulk_update(validated_instances_to_update, fields=fields)
 
     def bulk_update_or_create_one_to_many(self):
-        for relation, product, instances in self.get_all_o2m_instances:
+        for relation, parent, instances in self.get_all_o2m_instances:
             for instance in instances:
-                setattr(instance, relation.field.name, product)
+                setattr(instance, relation.field.name, parent)
 
         instances_to_create, instances_to_update, identities = self.get_o2m_relations
 
@@ -315,14 +315,12 @@ def bulk_update_or_create_one_to_many(self):
                 if fields is not None:
                     conditions = Q()
                     identifiers = self.identifier_mapping[relation.related_model]
-                    for key in keys:
+                    for key in set(keys):
                         if isinstance(key, (list, tuple)):
                             conditions |= Q(**dict(list(zip(identifiers, key))))
                         else:
                             conditions |= Q(**{f"{identifiers[0]}": key})
-                    field_name = relation.remote_field.attname.replace(
-                        "_", "__"
-                    ).replace("id", instance_identifier)
+                    field_name = f"{relation.remote_field.name}__{instance_identifier}"
                     # Delete all related one_to_many instances where product is in the
                     # given list of resources and excluding any instances present in
                     # those resources
diff --git a/oscar_odin/mappings/resources.py b/oscar_odin/mappings/resources.py
new file mode 100644
index 0000000..8af0216
--- /dev/null
+++ b/oscar_odin/mappings/resources.py
@@ -0,0 +1,44 @@
+from oscar_odin.mappings.context import ModelMapperContext
+from oscar_odin.utils import validate_resources
+
+
+def resources_to_db(
+    resources,
+    fields_to_update,
+    identifier_mapping,
+    model_mapper,
+    delete_related=False,
+    clean_instances=True,
+    skip_invalid_resources=False,
+    error_identifiers=None,
+):
+    """Map mulitple resources to a model and store them in the database.
+
+    The method will first bulk update or create the foreign keys
+    After that all the resources will be bulk saved.
+    At last all related models can will be saved and set on the record.
+    """
+    error_identifiers = error_identifiers or identifier_mapping.get(model_mapper.to_obj)
+    valid_resources, resource_errors = validate_resources(resources, error_identifiers)
+    if not skip_invalid_resources and resource_errors:
+        return [], resource_errors
+
+    context = ModelMapperContext(
+        model_mapper.to_obj,
+        delete_related=delete_related,
+        error_identifiers=error_identifiers,
+    )
+    result = model_mapper.apply(valid_resources, context=context)
+
+    try:
+        instances = list(result)
+    except TypeError:  # it is not a list
+        instances = [result]
+
+    saved_resources, errors = context.bulk_save(
+        instances,
+        fields_to_update,
+        identifier_mapping,
+        clean_instances,
+    )
+    return saved_resources, resource_errors + errors