Fix false positive in when a sequence has a symbol proc argument.

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Master (Unreleased)
 
 * Fix false positive in `RSpec/Pending` cop when pending is used as a method name.  ([@Darhazer][])
+* Fix `FactoryBot/DynamicAttributeDefinedStatically` false positive when using symbol proc argument for a sequence. ([@tdeo][])
 
 ## 1.25.0 (2018-04-07)
 
@@ -330,3 +331,4 @@ Compatibility release so users can upgrade RuboCop to 0.51.0. No new features.
 [@jojos003]: https://github.com/jojos003
 [@abrom]: https://github.com/abrom
 [@patrickomatic]: https://github.com/patrickomatic
+[@tdeo]: https://github.com/tdeo

lib/rubocop/cop/rspec/factory_bot/dynamic_attribute_defined_statically.rb

@@ -31,13 +31,13 @@ class DynamicAttributeDefinedStatically < Cop
             (block (send nil? {:factory :trait} ...) _ { (begin $...) $(send ...) } )
           PATTERN
 
-          def_node_matcher :callback_with_symbol_proc?, <<-PATTERN
-            (send nil? {:before :after} sym (block_pass sym))
+          def_node_matcher :callback_or_sequence_with_symbol_proc?, <<-PATTERN
+            (send nil? {:before :after :sequence} sym (block_pass sym))
           PATTERN
 
           def on_block(node)
             factory_attributes(node).to_a.flatten.each do |attribute|
-              next if callback_with_symbol_proc?(attribute) ||
+              next if callback_or_sequence_with_symbol_proc?(attribute) ||
                   static?(attribute)
               add_offense(attribute, location: :expression)
             end

spec/rubocop/cop/rspec/factory_bot/dynamic_attribute_defined_statically_spec.rb

@@ -87,6 +87,16 @@
         RUBY
       end
 
+      it 'accepts valid sequence definition' do
+        expect_no_offenses(<<-RUBY)
+          #{factory_bot}.define do
+            factory :post do
+              sequence :negative_numbers, &:-@
+            end
+          end
+        RUBY
+      end
+
       bad = <<-RUBY
         #{factory_bot}.define do
           factory :post do