fix: gracefully handle attempt to create a duplicate tag

lib/pact_broker/tags/repository.rb

@@ -9,7 +9,14 @@ class Repository
       include PactBroker::Repositories::Helpers
 
       def create args
-        Domain::Tag.new(name: args.fetch(:name), version: args.fetch(:version)).save
+        params = {
+          name: args.fetch(:name),
+          version_id: args.fetch(:version).id,
+          created_at: Sequel.datetime_class.now,
+          updated_at: Sequel.datetime_class.now
+        }
+        Domain::Tag.dataset.insert_ignore.insert(params)
+        Domain::Tag.find(name: args[:name], version_id: args[:version].id)
       end
 
       def find args

spec/lib/pact_broker/tags/repository_spec.rb

@@ -4,9 +4,42 @@
 module PactBroker
   module Tags
     describe Repository do
-
       let(:td) { TestDataBuilder.new }
 
+      describe ".create" do
+        before do
+          td.create_pacticipant("foo")
+            .create_version("1")
+        end
+
+        let(:params) { { name: "prod", version: td.version } }
+
+        subject { Repository.new.create(params) }
+
+        it "returns a tag" do
+          expect(subject).to be_a(Domain::Tag)
+        end
+
+        it "sets the properties" do
+          expect(subject.name).to eq "prod"
+          expect(subject.version.id).to eq td.version.id
+        end
+
+        context "when the tag already exists" do
+          before do
+            td.create_tag("prod")
+          end
+
+          it "does nothing" do
+            expect { subject }.to_not change { Domain::Tag.count }
+          end
+
+          it "returns a tag" do
+            expect(subject).to be_a(Domain::Tag)
+          end
+        end
+      end
+
       describe ".find" do
 
         let(:pacticipant_name) { "test_pacticipant" }

spec/support/test_data_builder.rb

@@ -35,6 +35,7 @@ class TestDataBuilder
   attr_reader :provider
   attr_reader :consumer_version
   attr_reader :provider_version
+  attr_reader :version
   attr_reader :pact
   attr_reader :verification
   attr_reader :webhook