From f173454b04d5156bacd7689e7460111274c5cc97 Mon Sep 17 00:00:00 2001
From: Marcus Ilgner <mail@marcusilgner.com>
Date: Wed, 1 Jul 2015 17:33:00 +0200
Subject: [PATCH] Fix uniqueness validator for non-paranoid associations

---
 lib/paranoia.rb       |  6 +++++-
 test/paranoia_test.rb | 22 ++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/lib/paranoia.rb b/lib/paranoia.rb
index 5f4993b0..a89ad876 100644
--- a/lib/paranoia.rb
+++ b/lib/paranoia.rb
@@ -250,7 +250,11 @@ class UniquenessValidator < ActiveModel::EachValidator
       protected
       def build_relation_with_paranoia(klass, table, attribute, value)
         relation = build_relation_without_paranoia(klass, table, attribute, value)
-        relation.and(klass.arel_table[klass.paranoia_column].eq(nil))
+        if klass.respond_to?(:paranoia_column)
+          relation.and(klass.arel_table[klass.paranoia_column].eq(nil))
+        else
+          relation
+        end
       end
       alias_method_chain :build_relation, :paranoia
     end
diff --git a/test/paranoia_test.rb b/test/paranoia_test.rb
index 1607bc8a..b2314644 100644
--- a/test/paranoia_test.rb
+++ b/test/paranoia_test.rb
@@ -37,6 +37,7 @@ def setup!
     'polymorphic_models' => 'parent_id INTEGER, parent_type STRING, deleted_at DATETIME',
     'namespaced_paranoid_has_ones' => 'deleted_at DATETIME, paranoid_belongs_tos_id INTEGER',
     'namespaced_paranoid_belongs_tos' => 'deleted_at DATETIME, paranoid_has_one_id INTEGER',
+    'unparanoid_unique_models' => 'name VARCHAR(32), paranoid_with_unparanoids_id INTEGER'
   }.each do |table_name, columns_as_sql_string|
     ActiveRecord::Base.connection.execute "CREATE TABLE #{table_name} (id INTEGER NOT NULL PRIMARY KEY, #{columns_as_sql_string})"
   end
@@ -821,6 +822,13 @@ def test_callbacks_for_counter_cache_column_update_on_destroy
     # assert related_model.instance_variable_get(:@after_commit_on_destroy_callback_called)
   end
 
+  def test_uniqueness_for_unparanoid_associated
+    parent_model = ParanoidWithUnparanoids.create
+    related = parent_model.unparanoid_unique_models.create
+    # will raise exception if model is not checked for paranoia
+    related.valid?
+  end
+
   # TODO: find a fix for Rails 4.1
   if ActiveRecord::VERSION::STRING !~ /\A4\.1/
     def test_counter_cache_column_update_on_really_destroy
@@ -862,6 +870,16 @@ class ParanoidModel < ActiveRecord::Base
   acts_as_paranoid
 end
 
+class ParanoidWithUnparanoids < ActiveRecord::Base
+  self.table_name = 'plain_models'
+  has_many :unparanoid_unique_models
+end
+
+class UnparanoidUniqueModel < ActiveRecord::Base
+  belongs_to :paranoid_with_unparanoids
+  validates :name, :uniqueness => true
+end
+
 class FailCallbackModel < ActiveRecord::Base
   belongs_to :parent_model
   acts_as_paranoid
@@ -874,6 +892,10 @@ class FeaturefulModel < ActiveRecord::Base
   validates :name, :presence => true, :uniqueness => true
 end
 
+class NonParanoidChildModel < ActiveRecord::Base
+  validates :name, :presence => true, :uniqueness => true
+end
+
 class PlainModel < ActiveRecord::Base
 end