Fix POST `/api/v1/admin/domain_allows` returning 200 when no domain is specified (#24958)

app/controllers/api/v1/admin/domain_allows_controller.rb

@@ -29,7 +29,7 @@ class Api::V1::Admin::DomainAllowsController < Api::BaseController
   def create
     authorize :domain_allow, :create?
 
-    @domain_allow = DomainAllow.find_by(resource_params)
+    @domain_allow = DomainAllow.find_by(domain: resource_params[:domain])
 
     if @domain_allow.nil?
       @domain_allow = DomainAllow.create!(resource_params)

spec/controllers/api/v1/admin/domain_allows_controller_spec.rb

@@ -128,5 +128,13 @@ RSpec.describe Api::V1::Admin::DomainAllowsController do
         expect(response).to have_http_status(422)
       end
     end
+
+    context 'when domain name is not specified' do
+      it 'returns http unprocessable entity' do
+        post :create
+
+        expect(response).to have_http_status(422)
+      end
+    end
   end
 end