Rendering an Enumerator with Puma > 6

[tomrossi7]

When upgrading from Puma 5 -> 6, we began receiving an undefined method to_ary error:

Read: #<NoMethodError: undefined method `to_ary' for #<Enumerator: #<Enumerator::Generator:0x000000011e938568>:each>>

We are using this to stream large CSV files while they are being generated. The body being being passed is an Enumerator built from an ActiveRecord collection.

[dentarg]

This is not a problem in Puma: #3112 (comment)

Are you using Rails? Maybe you are running into rails/rails@0174283

[tomrossi7]

We were able to fix the issue by using the ActionController#send_stream method.. Previously, we just set the body equal to the enumerator object.

[cimm]

We had the same error in Rails 7.1.1, upgrading Rails to 7.1.2 fixed it.