Check: set mode manual/auto before saving

app/models/check.rb

@@ -55,6 +55,7 @@ class Check < ApplicationRecord
   validates :vendor, length: { maximum: 255 }
 
   before_save :reset_consecutive_failures
+  before_save :set_mode
   after_update :reset_notifications
   after_save :enqueue_sync
 
@@ -128,4 +129,9 @@ class Check < ApplicationRecord
 
     self.consecutive_failures = 0
   end
+
+  def set_mode
+    return unless domain_changed?
+    self.mode = supported? ? :auto : :manual
+  end
 end

test/models/check_test.rb

@@ -91,4 +91,14 @@ class CheckTest < ActiveSupport::TestCase
     check = build(:check, :ssl, domain: "domain.cn")
     assert check.supported?
   end
+
+  test "set mode before saving" do
+    check = build(:check, domain: "domain.fr")
+    check.save!
+    assert check.auto?
+
+    check.domain = "domain.xyz"
+    check.save!
+    assert check.mode?
+  end
 end