feat(matrix): allow a limit to be specified

lib/pact_broker/matrix/parse_query.rb

@@ -28,6 +28,9 @@ def self.call query
         if params.key?('groupby')
           options[:groupby] = params['groupby']
         end
+        if params.key?('limit')
+          options[:limit] = params['limit']
+        end
         return selectors, options
       end
     end

lib/pact_broker/matrix/repository.rb

@@ -70,6 +70,8 @@ def find_all selectors, options
           query = where_consumer_and_provider_in(selectors, query)
         end
 
+        query = query.limit(options[:limit]) if options[:limit]
+
         query.order(:verification_executed_at, :verification_id).all
       end
 

lib/pact_broker/ui/controllers/matrix.rb

@@ -11,7 +11,7 @@ class Matrix < Base
 
         get "/provider/:provider_name/consumer/:consumer_name" do
           selectors = [{ pacticipant_name: params[:consumer_name] }, { pacticipant_name: params[:provider_name] } ]
-          lines = matrix_service.find(selectors)
+          lines = matrix_service.find(selectors, {latestby: 'cvpv', limit: 500})
           lines = lines.collect{|line| PactBroker::UI::ViewDomain::MatrixLine.new(line) }.sort
           locals = {
             lines: lines,

spec/lib/pact_broker/matrix/repository_spec.rb

@@ -42,6 +42,7 @@ def shorten_rows rows
         end
 
         subject { shorten_rows(Repository.new.find(selectors, options)) }
+
         let(:options) { { latestby: latestby } }
         let(:latestby) { nil }
         let(:a1_b1_n1) { "A1 B1 n1" }
@@ -50,6 +51,15 @@ def shorten_rows rows
         let(:a1_c1_n1) { "A1 C1 n1" }
         let(:a2_b__n_) { "A2 B? n?" }
 
+        context "when a limit is specified" do
+          let(:selectors) { build_selectors('A' => nil) }
+          let(:options) { {limit: 1} }
+
+          it "returns fewer rows than the limit (because some of the logic is done in the code, there may be fewer than the limit - need to fix this)" do
+            expect(subject.size).to eq 1
+          end
+        end
+
         context "when just the consumer name is specified" do
           let(:selectors) { build_selectors('A' => nil) }