Fix WrongScopeError being thrown on Rails master:

- ### Problem

  Rails made a change in rails/rails@d4367eb
  and TestFixtures don't make use of `method_name` anymore, but simply
  `name`.

  `name` on RSpec raises a `WrongScopeError` when called within an
  example.

  This patch overrides `name` to return the example name instead.

Author: Edouard-chin

lib/rspec/rails/fixture_support.rb

@@ -50,6 +50,12 @@ def self.proxy_method_warning_if_called_in_before_context_scope(method_name)
             end
           end
 
+          if ::ActiveRecord.version >= Gem::Version.new('6.1.0.alpha')
+            def name
+              @example
+            end
+          end
+
           fixtures RSpec.configuration.global_fixtures if RSpec.configuration.global_fixtures
         end
       end

spec/rspec/rails/fixture_support_spec.rb

@@ -13,5 +13,13 @@ module RSpec::Rails
         expect(group).to respond_to(:fixture_path=)
       end
     end
+
+    it "doesn't raise a WrongScopeError", skip: ::ActiveRecord.version < Gem::Version.new('6.1.0.alpha') do
+      group = RSpec::Core::ExampleGroup.describe do
+        include FixtureSupport
+      end
+
+      expect { group.new.name }.to_not raise_error
+    end
   end
 end