warning: loading in progress, circular require considered harmful

[brcarp]

gem 'dragonfly-s3_data_store'

$ grep dragonfly Gemfile
gem 'dragonfly-s3_data_store'
$ grep dragonfly Gemfile.lock
    dragonfly (1.1.4)
    dragonfly-s3_data_store (1.3.0)
      dragonfly (~> 1.0)
  dragonfly-s3_data_store
$ ruby -w -e 'require "dragonfly"'
/path/to/rubygems/core_ext/kernel_require.rb: warning: loading in progress, circular require considered harmful - /path/to/gems/dragonfly-1.1.4/lib/dragonfly.rb

Is this tied to dragonfly, this particular version, or some other dependency chain in the configuration? It would be helpful if others could comment as to its reproducibility.

[kolen]

Reproducible when having only dragonfly (ruby -w thisscript.rb).

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'dragonfly', '1.3.0', require: false
end

require 'dragonfly'

This was introduced in dragonfly 1.0, reproducible in versions >= 1.0, not reproducible in <= 0.9.15.

For example, dragonfly.rb requires dragonfly/middleware: https://github.com/markevans/dragonfly/blob/82254ecc81250ac03b5cff070c074990e5774b75/lib/dragonfly.rb#L12

And dragonfly/middleware.rb requires dragonfly again: https://github.com/markevans/dragonfly/blob/82254ecc81250ac03b5cff070c074990e5774b75/lib/dragonfly/middleware.rb#L1

This happens for:

• dragonfly -> dragonfly/app -> dragonfly/shell
• dragonfly -> dragonfly/model -> dragonfly/model/class_methods
• dragonfly -> dragonfly/middleware