Rails: Attempted to destroy a stale object

Problem

I'm trying to delete an object hierarchy via:

Foo.find_by_id(1).delete

where Foo has this dependency in ./app/models/foo.rb:

has_many :bars, :dependent => :destroy

but Rails is returning me this error:

Attempted to destroy a stale object: Bar

Environment

• Rails-3.2.16

Solution

Objects where duplicated manually (via SQL) and the `lock_version' field was left NULL. Setting the lock_version to 0 on the newly inserted objects made the error disappear.

Rationale

When running the command Foo.find_by_id(1).delete in the Rails console, I saw the this SQL command being executed just before the error:

  SQL (0.2ms)  DELETE FROM "bars" WHERE ("bars"."id" = 123 AND "bars"."lock_version" = 0)
   (0.1ms)  ROLLBACK
ActiveRecord::StaleObjectError: ActiveRecord::StaleObjectError

And I released I'd left lock_version to NULL.

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