NoMethodError: undefined method `relation_delegate_class' for Follow:Module

[marcguilera]

I'm trying to follow a user from a user. My User model has acts_as_followable and acts_as_follower. I'm on rails 5 so I have master on my Gemfile:

gem 'acts_as_follower', github: 'tcocca/acts_as_follower', branch: 'master'

I get this error when trying to follow a user:

2.3.0 :002 > User.first.follow User.second
User Load (0.6ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT $1 [["LIMIT", 1]]
User Load (0.4ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT $1 OFFSET $2 [["LIMIT", 1], ["OFFSET", 1]]
DEPRECATION WARNING: Setting custom parent classes is deprecated and will be removed in future versions. (called from parent_class_name at /usr/local/rvm/gems/ruby-2.3.0/bundler/gems/acts_as_follower-c5ac7b9601c4/lib/acts_as_follower/follower_lib.rb:10)
NoMethodError: undefined method relation_delegate_class' for Follow:Module from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-5.0.2/lib/active_record/relation/delegation.rb:107:in relation_class_for'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-5.0.2/lib/active_record/relation/delegation.rb:101:in create' from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-5.0.2/lib/active_record/associations/collection_association.rb:47:in reader'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activerecord-5.0.2/lib/active_record/associations/builder/association.rb:111:in follows' from /usr/local/rvm/gems/ruby-2.3.0/bundler/gems/acts_as_follower-c5ac7b9601c4/lib/acts_as_follower/follower.rb:33:in follow'
from (irb):2
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.2/lib/rails/commands/console.rb:65:in start' from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.2/lib/rails/commands/console_helper.rb:9:in start'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:78:in console' from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.2/lib/rails/commands/commands_tasks.rb:49:in run_command!'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-5.0.2/lib/rails/commands.rb:18:in <top (required)>' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in require'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in block in require' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:259:in load_dependency'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:293:in require' from /home/ubuntu/workspace/drezr/drezr-api/bin/rails:9:in <top (required)>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:287:in load' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:287:in block in load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:259:in load_dependency' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-5.0.2/lib/active_support/dependencies.rb:287:in load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/commands/rails.rb:6:in call' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/command_wrapper.rb:38:in call'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:191:in block in serve' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:161:in fork'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:161:in serve' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:131:in block in run'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:125:in loop' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application.rb:125:in run'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-2.0.1/lib/spring/application/boot.rb:19:in <top (required)>' from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require'
from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in require' from -e:1:in

'2.3.0 :003 >

[kylesnowschwartz]

Old post, but I recently had an issue where an empty directory with the same name as my model was causing this error to be raised. Try running the following code:
git clean -x -n -f -d | grep follow which should show you if you have an untracked directory named 'follow'. If so, and it's not supposed to be there, try removing that directory.