Add unique_by support to upsert

lib/oaken/stored/active_record.rb

@@ -20,12 +20,12 @@ def create(label = nil, **attributes)
     record
   end
 
-  def upsert(label = nil, **attributes)
+  def upsert(label = nil, unique_by: nil, **attributes)
     attributes = @attributes.merge(attributes)
     attributes.transform_values! { _1.respond_to?(:call) ? _1.call : _1 }
 
     type.new(attributes).validate!
-    record = type.new(id: type.upsert(attributes, returning: :id).rows.first.first)
+    record = type.new(id: type.upsert(attributes, unique_by: unique_by, returning: :id).rows.first.first)
     label label => record if label
     record
   end

test/dummy/db/migrate/20231017160024_create_plans.rb

@@ -5,6 +5,8 @@ def change
       t.integer :price_cents, null: false
 
       t.timestamps
+
+      t.index :title, unique: true, name: "uniqueness"
     end
   end
 end

test/dummy/db/schema.rb

@@ -56,6 +56,7 @@
     t.integer "price_cents", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["title"], name: "uniqueness", unique: true
   end
 
   create_table "users", force: :cascade do |t|

test/dummy/db/seeds.rb

@@ -9,6 +9,7 @@ def users.create_labelled(label, **) = create(label, **)
 
   section :stems
   section :leafs
+  def plans.upsert(*, unique_by: :title, **) = super
 
   section do
     seed :accounts, :data