work around lack of Rack::MethodOverride in Rails api by artifically …

…accepting _method: delete

config/routes.rb

@@ -1,8 +1,12 @@
 # frozen_string_literal: true
 
 LetterOpenerWeb::Engine.routes.draw do
-  delete 'clear'                 => 'letters#clear',    as: :clear_letters
-  delete ':id'                   => 'letters#destroy',  as: :delete_letter
+  delete_pseudo_method_constraint = ->(req) { req.params['_method'] == 'delete' }
+
+  delete 'clear'                 => 'letters#clear', as: :clear_letters
+  post 'clear'                   => 'letters#clear', constraints: delete_pseudo_method_constraint
+  delete ':id'                   => 'letters#destroy', as: :delete_letter
+  post ':id'                     => 'letters#destroy', constraints: delete_pseudo_method_constraint
   get    '/'                     => 'letters#index',    as: :letters
   get    ':id(/:style)'          => 'letters#show',     as: :letter
   get    ':id/attachments/:file' => 'letters#attachment'

spec/controllers/letter_opener_web/letters_controller_spec.rb

@@ -112,15 +112,25 @@
       delete :clear
       expect(response).to redirect_to(letters_path)
     end
+
+    it 'works with a post and _method: delete pseudo delete method' do
+      post :clear, params: { _method: 'delete' }
+      expect(response).to redirect_to(letters_path)
+    end
   end
 
   describe 'DELETE destroy' do
     let(:id) { 'an-id' }
+    before { allow_any_instance_of(LetterOpenerWeb::Letter).to receive(:exists?).and_return(true) }
 
     it 'removes the selected letter' do
-      allow_any_instance_of(LetterOpenerWeb::Letter).to receive(:exists?).and_return(true)
       expect_any_instance_of(LetterOpenerWeb::Letter).to receive(:delete)
       delete :destroy, params: { id: id }
     end
+
+    it 'works with a post and _method: delete pseudo delete method' do
+      expect_any_instance_of(LetterOpenerWeb::Letter).to receive(:delete)
+      post :destroy, params: { _method: 'delete', id: id }
+    end
   end
 end