fix: properly scope deletes to the records in question

fixes #29

lib/data_layer.ex

@@ -1359,6 +1359,7 @@ defmodule AshSqlite.DataLayer do
           changeset.context
         )
         |> Ecto.Query.select(^select)
+        |> pkey_filter(changeset.data)
 
       case AshSql.Atomics.query_with_atomics(
              resource,
@@ -1410,6 +1411,15 @@ defmodule AshSqlite.DataLayer do
     end
   end
 
+  defp pkey_filter(query, %resource{} = record) do
+    pkey =
+      record
+      |> Map.take(Ash.Resource.Info.primary_key(resource))
+      |> Map.to_list()
+
+    Ecto.Query.where(query, ^pkey)
+  end
+
   @impl true
   def destroy(resource, %{data: record} = changeset) do
     ecto_changeset = ecto_changeset(record, changeset, :delete)

test/update_test.exs

@@ -0,0 +1,46 @@
+defmodule AshSqlite.Test.UpdateTest do
+  use AshSqlite.RepoCase, async: false
+  alias AshSqlite.Test.Post
+
+  require Ash.Query
+
+  test "updating a record when multiple records are in the table will only update the desired record" do
+    # This test is here because of a previous bug in update that caused
+    # all records in the table to be updated.
+    id_1 = Ash.UUID.generate()
+    id_2 = Ash.UUID.generate()
+
+    new_post_1 =
+      Post
+      |> Ash.Changeset.for_create(:create, %{
+        id: id_1,
+        title: "new_post_1"
+      })
+      |> Ash.create!()
+
+    _new_post_2 =
+      Post
+      |> Ash.Changeset.for_create(:create, %{
+        id: id_2,
+        title: "new_post_2"
+      })
+      |> Ash.create!()
+
+    {:ok, updated_post_1} =
+      new_post_1
+      |> Ash.Changeset.for_update(:update, %{
+        title: "new_post_1_updated"
+      })
+      |> Ash.update()
+
+    # It is deliberate that post 2 is re-fetched from the db after the
+    # update to post 1. This ensure that post 2 was not updated.
+    post_2 = Ash.get!(Post, id_2)
+
+    assert updated_post_1.id == id_1
+    assert updated_post_1.title == "new_post_1_updated"
+
+    assert post_2.id == id_2
+    assert post_2.title == "new_post_2"
+  end
+end