Separate cron_valid? and cron_time_zone_valid?

app/models/ci/trigger_schedule.rb

@@ -12,7 +12,7 @@ module Ci
 
     validates :trigger, presence: { unless: :importing? }
     validates :cron, cron: true, presence: { unless: :importing? }
-    validates :cron_time_zone, presence: { unless: :importing? }
+    validates :cron_time_zone, cron_time_zone: true, presence: { unless: :importing? }
     validates :ref, presence: { unless: :importing? }
 
     after_create :schedule_next_run!

app/validators/cron_time_zone_validator.rb

@@ -0,0 +1,9 @@
+# CronTimeZoneValidator
+#
+# Custom validator for CronTimeZone.
+class CronTimeZoneValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    cron_parser = Gitlab::Ci::CronParser.new(record.cron, record.cron_time_zone)
+    record.errors.add(attribute, " is invalid syntax") unless cron_parser.cron_time_zone_valid?
+  end
+end

app/validators/cron_validator.rb

@@ -4,12 +4,6 @@
 class CronValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     cron_parser = Gitlab::Ci::CronParser.new(record.cron, record.cron_time_zone)
-    is_valid_cron, is_valid_cron_time_zone = cron_parser.validation
-
-    if !is_valid_cron
-      record.errors.add(:cron, " is invalid syntax")
-    elsif !is_valid_cron_time_zone
-      record.errors.add(:cron_time_zone, " is invalid timezone")
-    end
+    record.errors.add(attribute, " is invalid syntax") unless cron_parser.cron_valid?
   end
 end

lib/gitlab/ci/cron_parser.rb

@@ -14,10 +14,12 @@ module Gitlab
         cron_line.next_time(time).in_time_zone(Time.zone) if cron_line.present?
       end
 
-      def validation
-        is_valid_cron = try_parse_cron(@cron, VALID_SYNTAX_SAMPLE_TIME_ZONE).present?
-        is_valid_cron_time_zone = try_parse_cron(VALID_SYNTAX_SAMPLE_CRON, @cron_time_zone).present?
-        return is_valid_cron, is_valid_cron_time_zone
+      def cron_valid?
+        try_parse_cron(@cron, VALID_SYNTAX_SAMPLE_TIME_ZONE).present?
+      end
+
+      def cron_time_zone_valid?
+        try_parse_cron(VALID_SYNTAX_SAMPLE_CRON, @cron_time_zone).present?
       end
 
       private

spec/lib/gitlab/ci/cron_parser_spec.rb

@@ -82,23 +82,35 @@ describe Gitlab::Ci::CronParser do
     end
   end
 
-  describe '#validation' do
-    it 'returns results' do
-      is_valid_cron, is_valid_cron_time_zone = described_class.new('* * * * *', 'Europe/Istanbul').validation
-      expect(is_valid_cron).to eq(true)
-      expect(is_valid_cron_time_zone).to eq(true)
+  describe '#cron_valid?' do
+    subject { described_class.new(cron, Gitlab::Ci::CronParser::VALID_SYNTAX_SAMPLE_TIME_ZONE).cron_valid? }
+
+    context 'when cron is valid' do
+      let(:cron) { '* * * * *' }
+
+      it { is_expected.to eq(true) }
     end
 
-    it 'returns results' do
-      is_valid_cron, is_valid_cron_time_zone = described_class.new('*********', 'Europe/Istanbul').validation
-      expect(is_valid_cron).to eq(false)
-      expect(is_valid_cron_time_zone).to eq(true)
+    context 'when cron is invalid' do
+      let(:cron) { '*********' }
+
+      it { is_expected.to eq(false) }
+    end
+  end
+
+  describe '#cron_time_zone_valid?' do
+    subject { described_class.new(Gitlab::Ci::CronParser::VALID_SYNTAX_SAMPLE_CRON, cron_time_zone).cron_time_zone_valid? }
+
+    context 'when cron is valid' do
+      let(:cron_time_zone) { 'Europe/Istanbul' }
+
+      it { is_expected.to eq(true) }
     end
 
-    it 'returns results' do
-      is_valid_cron, is_valid_cron_time_zone = described_class.new('* * * * *', 'Invalid-zone').validation
-      expect(is_valid_cron).to eq(true)
-      expect(is_valid_cron_time_zone).to eq(false)
+    context 'when cron is invalid' do
+      let(:cron_time_zone) { 'Invalid-zone' }
+
+      it { is_expected.to eq(false) }
     end
   end
 end