Add uniqueness validation to sentry_issue_identifer

Add a uniquness validation to the SentryIssue table on the
sentry_issue_identifier scoped to the project. Change the SentryFinder
to be determanistic by adding an order to the query.

app/models/sentry_issue.rb

@@ -5,13 +5,22 @@ class SentryIssue < ApplicationRecord
 
   validates :issue, uniqueness: true, presence: true
   validates :sentry_issue_identifier, presence: true
+  validate :ensure_sentry_issue_identifier_is_unique_per_project
 
   after_create_commit :enqueue_sentry_sync_job
 
   def self.for_project_and_identifier(project, identifier)
     joins(:issue)
       .where(issues: { project_id: project.id })
-      .find_by_sentry_issue_identifier(identifier)
+      .where(sentry_issue_identifier: identifier)
+      .order('issues.created_at').last
+  end
+
+  def ensure_sentry_issue_identifier_is_unique_per_project
+    if issue && self.class.for_project_and_identifier(issue.project, sentry_issue_identifier).present?
+      # Custom message because field is hidden
+      errors.add(:_, _('is already associated to a GitLab Issue. New issue will not be associated.'))
+    end
   end
 
   def enqueue_sentry_sync_job

locale/gitlab.pot

@@ -22692,6 +22692,9 @@ msgstr ""
 msgid "is"
 msgstr ""
 
+msgid "is already associated to a GitLab Issue. New issue will not be associated."
+msgstr ""
+
 msgid "is an invalid IP address range"
 msgstr ""
 

spec/models/sentry_issue_spec.rb

@@ -13,6 +13,20 @@ describe SentryIssue do
     it { is_expected.to validate_presence_of(:issue) }
     it { is_expected.to validate_uniqueness_of(:issue) }
     it { is_expected.to validate_presence_of(:sentry_issue_identifier) }
+
+    it 'allows duplicated sentry_issue_identifier' do
+      duplicate_sentry_issue = build(:sentry_issue, sentry_issue_identifier: sentry_issue.sentry_issue_identifier)
+
+      expect(duplicate_sentry_issue).to be_valid
+    end
+
+    it 'validates uniqueness of sentry_issue_identifier per project' do
+      second_issue = create(:issue, project: sentry_issue.issue.project)
+      duplicate_sentry_issue = build(:sentry_issue, issue: second_issue, sentry_issue_identifier: sentry_issue.sentry_issue_identifier)
+
+      expect(duplicate_sentry_issue).to be_invalid
+      expect(duplicate_sentry_issue.errors.full_messages.first).to include('is already associated')
+    end
   end
 
   describe 'callbacks' do
@@ -28,13 +42,16 @@ describe SentryIssue do
   end
 
   describe '.for_project_and_identifier' do
-    let!(:sentry_issue) { create(:sentry_issue) }
-    let(:project) { sentry_issue.issue.project }
-    let(:identifier) { sentry_issue.sentry_issue_identifier }
-    let!(:second_sentry_issue) { create(:sentry_issue) }
+    it 'finds the most recent per project and sentry_issue_identifier' do
+      sentry_issue = create(:sentry_issue)
+      create(:sentry_issue)
+      project = sentry_issue.issue.project
+      sentry_issue_3 = build(:sentry_issue, issue: create(:issue, project: project), sentry_issue_identifier: sentry_issue.sentry_issue_identifier)
+      sentry_issue_3.save(validate: false)
 
-    subject { described_class.for_project_and_identifier(project, identifier) }
+      result = described_class.for_project_and_identifier(project, sentry_issue.sentry_issue_identifier)
 
-    it { is_expected.to eq(sentry_issue) }
+      expect(result).to eq(sentry_issue_3)
+    end
   end
 end