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author | Patrick Bajao <ebajao@gitlab.com> | 2019-04-12 12:19:45 +0800 |
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committer | Patrick Bajao <ebajao@gitlab.com> | 2019-04-12 12:42:20 +0800 |
commit | f103b1e7d4d83ba4b7d1b43bb7d0a0320b4b8f35 (patch) | |
tree | e8a833cfcaf5847860e299ada6256386c86e5255 | |
parent | 5c46af40687ae7529c33211464724f909051eb05 (diff) | |
download | gitlab-ce-f103b1e7d4d83ba4b7d1b43bb7d0a0320b4b8f35.tar.gz |
Add ApplicationRecord#safe_ensure_unique method
Port of https://dev.gitlab.org/gitlab/gitlab-ee/merge_requests/866
to CE excluding the migration and service changes as they don't
apply to CE.
-rw-r--r-- | app/models/application_record.rb | 17 | ||||
-rw-r--r-- | spec/models/application_record_spec.rb | 19 |
2 files changed, 33 insertions, 3 deletions
diff --git a/app/models/application_record.rb b/app/models/application_record.rb index 6976185264e..348468197bf 100644 --- a/app/models/application_record.rb +++ b/app/models/application_record.rb @@ -15,6 +15,19 @@ class ApplicationRecord < ActiveRecord::Base where(nil).pluck(self.primary_key) end + def self.safe_ensure_unique(retries: 0) + transaction(requires_new: true) do + yield + end + rescue ActiveRecord::RecordNotUnique + if retries > 0 + retries -= 1 + retry + end + + false + end + def self.safe_find_or_create_by!(*args) safe_find_or_create_by(*args).tap do |record| record.validate! unless record.persisted? @@ -22,10 +35,8 @@ class ApplicationRecord < ActiveRecord::Base end def self.safe_find_or_create_by(*args) - transaction(requires_new: true) do + safe_ensure_unique(retries: 1) do find_or_create_by(*args) end - rescue ActiveRecord::RecordNotUnique - retry end end diff --git a/spec/models/application_record_spec.rb b/spec/models/application_record_spec.rb index fd25132ed3a..cc90a998d3f 100644 --- a/spec/models/application_record_spec.rb +++ b/spec/models/application_record_spec.rb @@ -11,6 +11,25 @@ describe ApplicationRecord do end end + describe '.safe_ensure_unique' do + let(:model) { build(:suggestion) } + let(:klass) { model.class } + + before do + allow(model).to receive(:save).and_raise(ActiveRecord::RecordNotUnique) + end + + it 'returns false when ActiveRecord::RecordNotUnique is raised' do + expect(model).to receive(:save).once + expect(klass.safe_ensure_unique { model.save }).to be_falsey + end + + it 'retries based on retry count specified' do + expect(model).to receive(:save).exactly(3).times + expect(klass.safe_ensure_unique(retries: 2) { model.save }).to be_falsey + end + end + describe '.safe_find_or_create_by' do it 'creates the user avoiding race conditions' do expect(Suggestion).to receive(:find_or_create_by).and_raise(ActiveRecord::RecordNotUnique) |