Merge pull request #205 from joshpencheon/remove_foreign_key_to_table

# Address false positive when reversing remove_foreign_key

Author: koic

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 * [#180](https://github.com/rubocop-hq/rubocop-rails/issues/180): Fix a false positive for `HttpPositionalArguments` when using `get` method with `:to` option. ([@koic][])
 * [#193](https://github.com/rubocop-hq/rubocop-rails/issues/193): Make `Rails/EnvironmentComparison` aware of `Rails.env` is used in RHS or when `!=` is used for comparison. ([@koic][])
+* [#205](https://github.com/rubocop-hq/rubocop-rails/pull/205): Make `Rails/ReversibleMigration` aware of `:to_table` option of `remove_foreign_key`. ([@joshpencheon][])
 
 ## 2.4.2 (2020-01-26)
 
@@ -141,3 +142,4 @@
 [@mvz]: https://github.com/mvz
 [@fidalgo]: https://github.com/fidalgo
 [@hanachin]: https://github.com/hanachin
+[@joshpencheon]: https://github.com/joshpencheon

lib/rubocop/cop/rails/reversible_migration.rb

@@ -90,6 +90,11 @@ module Rails
       #     remove_foreign_key :accounts, :branches
       #   end
       #
+      #   # good
+      #   def change
+      #     remove_foreign_key :accounts, to_table: :branches
+      #   end
+      #
       # @example
       #   # change_table
       #
@@ -210,7 +215,7 @@ def check_remove_column_node(node)
 
         def check_remove_foreign_key_node(node)
           remove_foreign_key_call(node) do |arg|
-            if arg.hash_type?
+            if arg.hash_type? && !all_hash_key?(arg, :to_table)
               add_offense(
                 node,
                 message: format(MSG,

manual/cops_rails.md

@@ -2053,6 +2053,11 @@ end
 def change
   remove_foreign_key :accounts, :branches
 end
+
+# good
+def change
+  remove_foreign_key :accounts, to_table: :branches
+end
 ```
 ```ruby
 # change_table

spec/rubocop/cop/rails/reversible_migration_spec.rb

@@ -169,6 +169,10 @@ def change
       remove_foreign_key :accounts, :branches
     RUBY
 
+    it_behaves_like 'accepts', 'remove_foreign_key(with :to_table)', <<~RUBY
+      remove_foreign_key :accounts, to_table: :branches
+    RUBY
+
     it_behaves_like 'offense', 'remove_foreign_key(without table)', <<~RUBY
       remove_foreign_key :accounts, column: :owner_id
     RUBY