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-rw-r--r--activerecord/lib/active_record/attribute_methods/read.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/read.rb b/activerecord/lib/active_record/attribute_methods/read.rb
index 369a6e35aa..fdc4bf6621 100644
--- a/activerecord/lib/active_record/attribute_methods/read.rb
+++ b/activerecord/lib/active_record/attribute_methods/read.rb
@@ -54,7 +54,7 @@ module ActiveRecord
attr_name.to_s
end
- name = self.class.primary_key if name == "id".freeze
+ name = self.class.primary_key if name == "id".freeze && self.class.primary_key
_read_attribute(name, &block)
end