From a5586126d179ad89bf48dd09fb4c8d98be3a841c Mon Sep 17 00:00:00 2001
From: Ryuta Kamizono <kamipo@gmail.com>
Date: Wed, 15 Feb 2017 03:52:18 +0900
Subject: Fix type casting AR object to respect the primary key cast type's
 serialization

---
 .../connection_adapters/abstract/quoting.rb        | 15 ++++++++++--
 activerecord/test/cases/quoting_test.rb            | 27 ++++++++++++++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
index 7f4132accf..a99b58f41c 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/quoting.rb
@@ -7,8 +7,11 @@ module ActiveRecord
       # Quotes the column value to help prevent
       # {SQL injection attacks}[http://en.wikipedia.org/wiki/SQL_injection].
       def quote(value)
-        # records are quoted as their primary key
-        return value.quoted_id if value.respond_to?(:quoted_id)
+        value = id_value_for_database(value) if value.is_a?(Base)
+
+        if value.respond_to?(:quoted_id)
+          return value.quoted_id
+        end
 
         _quote(value)
       end
@@ -17,6 +20,8 @@ module ActiveRecord
       # SQLite does not understand dates, so this method will convert a Date
       # to a String.
       def type_cast(value, column = nil)
+        value = id_value_for_database(value) if value.is_a?(Base)
+
         if value.respond_to?(:quoted_id) && value.respond_to?(:id)
           return value.id
         end
@@ -151,6 +156,12 @@ module ActiveRecord
           binds.map { |attr| type_cast(attr.value_for_database) }
         end
 
+        def id_value_for_database(value)
+          if primary_key = value.class.primary_key
+            value.instance_variable_get(:@attributes)[primary_key].value_for_database
+          end
+        end
+
         def types_which_need_no_typecasting
           [nil, Numeric, String]
         end
diff --git a/activerecord/test/cases/quoting_test.rb b/activerecord/test/cases/quoting_test.rb
index 33f8834cbf..2541adbe72 100644
--- a/activerecord/test/cases/quoting_test.rb
+++ b/activerecord/test/cases/quoting_test.rb
@@ -221,5 +221,32 @@ module ActiveRecord
         assert_predicate @connection.type_cast(false), :frozen?
       end
     end
+
+    if subsecond_precision_supported?
+      class QuoteARBaseTest < ActiveRecord::TestCase
+        class DatetimePrimaryKey < ActiveRecord::Base
+        end
+
+        def setup
+          @time = ::Time.utc(2017, 2, 14, 12, 34, 56, 789999)
+          @connection = ActiveRecord::Base.connection
+          @connection.create_table :datetime_primary_keys, id: :datetime, precision: 3, force: true
+        end
+
+        def teardown
+          @connection.drop_table :datetime_primary_keys, if_exists: true
+        end
+
+        def test_quote_ar_object
+          value = DatetimePrimaryKey.new(id: @time)
+          assert_equal "'2017-02-14 12:34:56.789000'",  @connection.quote(value)
+        end
+
+        def test_type_cast_ar_object
+          value = DatetimePrimaryKey.new(id: @time)
+          assert_equal "2017-02-14 12:34:56.789000",  @connection.type_cast(value)
+        end
+      end
+    end
   end
 end
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