fix: set tenant attribute in bulk create

fixes: #830

lib/ash/actions/create/bulk.ex

@@ -269,6 +269,7 @@ defmodule Ash.Actions.Create.Bulk do
     })
     |> Ash.Actions.Helpers.add_context(opts)
     |> Ash.Changeset.set_context(opts[:context] || %{})
+    |> set_tenant()
     |> Ash.Changeset.prepare_changeset_for_action(action, opts)
   end
 
@@ -474,6 +475,19 @@ defmodule Ash.Actions.Create.Bulk do
     |> set_lazy_matching_defaults(lazy_matching_default_values)
   end
 
+  defp set_tenant(changeset) do
+    if changeset.tenant &&
+         Ash.Resource.Info.multitenancy_strategy(changeset.resource) == :attribute do
+      attribute = Ash.Resource.Info.multitenancy_attribute(changeset.resource)
+      {m, f, a} = Ash.Resource.Info.multitenancy_parse_attribute(changeset.resource)
+      attribute_value = apply(m, f, [changeset.tenant | a])
+
+      Ash.Changeset.force_change_attribute(changeset, attribute, attribute_value)
+    else
+      changeset
+    end
+  end
+
   defp handle_params(changeset, false, action, _opts, input, _argument_names) do
     Ash.Changeset.handle_params(changeset, action, input)
   end

test/actions/bulk/bulk_create_test.exs

@@ -32,16 +32,37 @@ defmodule Ash.Test.Actions.BulkCreateTest do
     end
   end
 
+  defmodule Org do
+    @moduledoc false
+    use Ash.Resource,
+      data_layer: Ash.DataLayer.Ets
+
+    attributes do
+      uuid_primary_key :id
+    end
+
+    actions do
+      defaults [:create]
+    end
+  end
+
   defmodule Post do
     @moduledoc false
     use Ash.Resource,
       data_layer: Ash.DataLayer.Ets,
       authorizers: [Ash.Policy.Authorizer]
 
+    alias Ash.Test.Actions.BulkCreateTest.Org
+
     ets do
       private? true
     end
 
+    multitenancy do
+      strategy :attribute
+      attribute :org_id
+    end
+
     actions do
       defaults [:create, :read, :update, :destroy]
 
@@ -104,6 +125,13 @@ defmodule Ash.Test.Actions.BulkCreateTest do
 
       timestamps()
     end
+
+    relationships do
+      belongs_to :org, Org do
+        allow_nil? false
+        attribute_writable? true
+      end
+    end
   end
 
   defmodule Registry do
@@ -111,6 +139,7 @@ defmodule Ash.Test.Actions.BulkCreateTest do
     use Ash.Registry
 
     entries do
+      entry Org
       entry Post
     end
   end
@@ -125,11 +154,17 @@ defmodule Ash.Test.Actions.BulkCreateTest do
   end
 
   test "returns created records" do
+    org =
+      Org
+      |> Ash.Changeset.for_create(:create, %{})
+      |> Api.create!()
+
     assert %Ash.BulkResult{records: [%{title: "title1"}, %{title: "title2"}]} =
              Api.bulk_create!([%{title: "title1"}, %{title: "title2"}], Post, :create,
                return_records?: true,
                return_errors?: true,
-               sorted?: true
+               sorted?: true,
+               tenant: org.id
              )
   end