Unscope update_column(s) query to ignore default scope

When applying default_scope to a class with a where clause, using
update_column(s) could generate a query that would not properly update
the record due to the where clause from the default_scope being applied
to the update query.

    class User < ActiveRecord::Base
      default_scope where(active: true)
    end

    user = User.first
    user.active = false
    user.save!

    user.update_column(:active, true) # => false

In this situation we want to skip the default_scope clause and just
update the record based on the primary key. With this change:

    user.update_column(:active, true) # => true

Backport of #8436 fix.

Conflicts:
	activerecord/CHANGELOG.md
	activerecord/lib/active_record/persistence.rb
	activerecord/test/cases/persistence_test.rb

1 files changed, 1 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index fd3380a53c..36b6b5fce2 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -194,7 +194,7 @@ module ActiveRecord
       raise ActiveRecordError, "#{name} is marked as readonly" if self.class.readonly_attributes.include?(name)
       raise ActiveRecordError, "can not update on a new record object" unless persisted?
 
-      updated_count = self.class.update_all({ name => value }, self.class.primary_key => id)
+      updated_count = self.class.unscoped.update_all({ name => value }, self.class.primary_key => id)
 
       raw_write_attribute(name, value)