Add validation for length of object_event_types

app/models/object_event_hook_config.rb

@@ -12,7 +12,7 @@ class ObjectEventHookConfig < ApplicationRecord
 
   validates :webhook_service, presence: true
   validates :configuration, presence: true
-  validates :object_event_types, presence: true
+  validates :object_event_types, presence: true, length: {minimum: 1}
 
   def webhook
     Houdini::WebhookAdapter.build(webhook_service, configuration.symbolize_keys)

spec/models/object_event_hook_config_spec.rb

@@ -8,6 +8,21 @@ RSpec.describe ObjectEventHookConfig, type: :model do
   let(:nonprofit) { create(:nm_justice) }
   let(:open_fn_config) { create(:open_fn_config, nonprofit_id: nonprofit.id) }
 
+  describe 'validation' do 
+    subject{ oehc = ObjectEventHookConfig.new(object_event_types:[]); oehc.validate; oehc}
+
+    it 'has an error for webhook_service missing' do 
+      expect(subject.errors[:webhook_service]).to_not be_nil
+    end
+
+    it 'has an error for configuraiton missing' do 
+      expect(subject.errors[:configuration]).to_not be_nil
+    end
+
+    it 'has an error for configuraition empty' do 
+      expect(subject.errors[:object_event_types]).to_not be_empty
+    end
+  end
   describe '.webhook' do
     it 'returns an instance of OpenFn webhook' do
       webhook = double