Rails/UniqueValidationWithoutIndex undefined method error

[dteoh]

$ bin/rubocop --only Rails/UniqueValidationWithoutIndex -d app/models/concerns/some_concern.rb
For /Users/dteoh/dev/some_project: configuration from /Users/dteoh/dev/some_project/.rubocop.yml
configuration from /Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-performance-1.8.0/config/default.yml
configuration from /Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-performance-1.8.0/config/default.yml
Default configuration from /Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/config/default.yml
configuration from /Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/config/default.yml
configuration from /Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/config/default.yml
Inspecting 1 file
Scanning /Users/dteoh/dev/some_project/app/models/concerns/some_concern.rb
An error occurred while Rails/UniqueValidationWithoutIndex cop was inspecting /Users/dteoh/dev/some_project/app/models/concerns/some_concern.rb:8:4.
undefined method `each_node' for nil:NilClass
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/mixin/active_record_helper.rb:14:in `find_set_table_name'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/mixin/active_record_helper.rb:35:in `each'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/mixin/active_record_helper.rb:35:in `to_a'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/mixin/active_record_helper.rb:35:in `table_name'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/rails/unique_validation_without_index.rb:49:in `find_schema_information'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-rails-2.8.0/lib/rubocop/cop/rails/unique_validation_without_index.rb:38:in `on_send'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:99:in `block (2 levels) in trigger_responding_cops'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:152:in `with_cop_error_handling'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:98:in `block in trigger_responding_cops'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:97:in `each'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:97:in `trigger_responding_cops'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:70:in `on_send'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:173:in `on_block'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:72:in `on_block'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:59:in `block in on_begin'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:59:in `each'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:59:in `on_begin'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:72:in `on_begin'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:159:in `on_while'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:72:in `on_module'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-ast-0.4.0/lib/rubocop/ast/traversal.rb:14:in `walk'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/commissioner.rb:85:in `investigate'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/team.rb:152:in `investigate_partial'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cop/team.rb:83:in `investigate'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:296:in `inspect_file'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:246:in `block in do_inspection_loop'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:278:in `block in iterate_until_no_changes'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:271:in `loop'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:271:in `iterate_until_no_changes'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:242:in `do_inspection_loop'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:122:in `block in file_offenses'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:147:in `file_offense_cache'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:121:in `file_offenses'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:112:in `process_file'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:91:in `block in each_inspected_file'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:90:in `each'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:90:in `reduce'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:90:in `each_inspected_file'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:79:in `inspect_files'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/runner.rb:40:in `run'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli/command/execute_runner.rb:22:in `execute_runner'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli/command/execute_runner.rb:14:in `run'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli/command.rb:11:in `run'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli/environment.rb:18:in `run'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli.rb:65:in `run_command'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli.rb:72:in `execute_runners'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/lib/rubocop/cli.rb:41:in `run'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/exe/rubocop:13:in `block in <top (required)>'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
/Users/dteoh/.asdf/installs/ruby/2.5.5/lib/ruby/gems/2.5.0/gems/rubocop-0.90.0/exe/rubocop:12:in `<top (required)>'
bin/rubocop:29:in `load'
bin/rubocop:29:in `<main>'
.

1 file inspected, no offenses detected

1 error occurred:
An error occurred while Rails/UniqueValidationWithoutIndex cop was inspecting /Users/dteoh/dev/some_project/app/models/concerns/some_concern.rb:8:4.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
https://github.com/rubocop-hq/rubocop/issues

---

Expected behavior

Ignore the module, or somehow apply the check in the context of the class that includes the module.

Actual behavior

Error occured.

Disabling the check does not work.

Steps to reproduce the problem

Module triggering the bug:

# app/models/concerns/some_concern.rb

# frozen_string_literal: true

# A test concern to trigger RuboCop bug.
module SomeConcern
  extend ActiveSupport::Concern

  included do
    validates :a_column, uniqueness: true
  end
end

RuboCop version

0.90.0 (using Parser 2.7.1.4, rubocop-ast 0.4.0, running on ruby 2.5.5 x86_64-darwin19)

[koic]

Dup with #348. Can you upgrade to the latest RuboCop Rails?
Thank you.

[dteoh]

Thank you, error has disappeared.