[Rails] I have a question about `ActiveRecord.locking_column`.

Ruby on Rails Sunday, June 10, 2018

Suppose the User model defines a column like this and does not have lock_version

```

class DeviseCreateUsers < ActiveRecord::Migration[5.1]

def change

create_table :users do |t|

t.string :name

# do not have a lock_version and other optimistic locks

end

```

When executing User.locking_column, I thought that I would return nil because This Model does not have locking_column, but return "locking_column".

Would you like to submit a PR that returns nil if there is no problem?

Thanks to read🙏

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