fix: handle race conditions when creating a pacticipant

lib/pact_broker/pacticipants/repository.rb

@@ -42,7 +42,13 @@ def find_by_name_or_create name
       end
 
       def create args
-        PactBroker::Domain::Pacticipant.new(name: args[:name], repository_url: args[:repository_url]).save(raise_on_save_failure: true)
+        id = PactBroker::Domain::Pacticipant.dataset.insert_ignore.insert(
+          name: args[:name],
+          repository_url: args[:repository_url],
+          created_at: Sequel.datetime_class.now,
+          updated_at: Sequel.datetime_class.now
+        )
+        PactBroker::Domain::Pacticipant.find(id: id)
       end
 
       def pacticipant_names

spec/lib/pact_broker/pacticipants/repository_spec.rb

@@ -5,6 +5,39 @@
 module PactBroker
   module Pacticipants
     describe Repository do
+      describe "#create" do
+        let(:repository) { Repository.new }
+
+        subject { repository.create(name: "Foo") }
+
+        context "when the pacticipant does not already exist" do
+          before do
+            TestDataBuilder.new.create_pacticipant("Bar")
+          end
+
+          subject { repository.create(name: "Foo") }
+
+          it "returns the new pacticipant" do
+            expect(subject).to be_a(PactBroker::Domain::Pacticipant)
+            expect(subject.name).to eq "Foo"
+          end
+        end
+
+        context "when a race condition occurs and the pacticipant was already created by another request" do
+          before do
+            TestDataBuilder.new.create_pacticipant("Foo")
+          end
+
+          it "does not raise an error" do
+            subject
+          end
+
+          it "returns the existing pacticipant" do
+            expect(subject).to be_a(PactBroker::Domain::Pacticipant)
+            expect(subject.name).to eq "Foo"
+          end
+        end
+      end
 
       describe "#find" do
         before do