Record should be destroyed whether it has a range key or not

[lisad]

I've got some code as follows, in which DeviceToken is a Dynamoid record and phone_number is its hash_key, but it also has a range key :

    DeviceToken.where(phone_number: user.phone_number).each do |device_token|
        device_token.destroy
    end

The 'where' succeeds, but the destroy fails with "a range key value is required for this table"

gems/aws-sdk-1.27.0/lib/aws/dynamo_db/item_collection.rb:244:in `at'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/adapter/aws_sdk.rb:129:in `delete_item'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/adapter.rb:146:in `block (3 levels) in <module:Adapter>'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/adapter.rb:39:in `benchmark'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/adapter.rb:146:in `block (2 levels) in <module:Adapter>'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/adapter.rb:121:in `delete'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/persistence.rb:214:in `delete'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/identity_map.rb:84:in `delete'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/persistence.rb:203:in `block in destroy'
gems/ruby-1.9.3-p448/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:373:in `_run__1909464996163745819__destroy__callbacks'
gems/ruby-1.9.3-p448/gems/activesupport-4.0.0/lib/active_support/callbacks.rb:80:in `run_callbacks'
gems/ruby-1.9.3-p448/gems/dynamoid-0.7.1/lib/dynamoid/persistence.rb:202:in `destroy'

Since the record has already been looked up by hash_key, destroy should just work