feat: optimise latest_verification_ids_for_consumer_version_tags

db/ddl_statements/latest_pact_consumer_version_orders.rb

@@ -1,3 +1,6 @@
+# The consumer id, provider id, and consumer version order
+# for the latest consumer version that has a pact with that provider.
+
 def latest_pact_consumer_version_orders_v1(connection = nil)
   "select provider_id, consumer_id, max(consumer_version_order) as latest_consumer_version_order
   from all_pact_publications

db/ddl_statements/latest_verification_ids_for_consumer_version_tags.rb

@@ -36,3 +36,18 @@
       join versions pv
         on v.provider_version_id = pv.id
       group by pv.pacticipant_id, lpp.consumer_id, t.name"
+
+LATEST_VERIFICATION_IDS_FOR_CONSUMER_VERSION_TAGS_V3 = "select
+        pv.pacticipant_id as provider_id,
+        lpp.consumer_id,
+        t.name as consumer_version_tag_name,
+        max(v.id) as latest_verification_id
+      from verifications v
+      join latest_pact_publication_ids_for_consumer_versions lpp
+        on v.pact_version_id = lpp.pact_version_id
+      join tags t
+        on lpp.consumer_version_id = t.version_id
+      join versions pv
+        on v.provider_version_id = pv.id
+      where v.id in (select latest_verification_id from latest_verification_ids_for_pact_versions)
+      group by pv.pacticipant_id, lpp.consumer_id, t.name"

db/migrations/20191031_optimise_latest_verification_ids_for_consumer_version_tags.rb

@@ -0,0 +1,13 @@
+require_relative '../ddl_statements'
+
+Sequel.migration do
+  up do
+    create_or_replace_view(:latest_verification_ids_for_consumer_version_tags,
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_VERSION_TAGS_V3)
+  end
+
+  down do
+    create_or_replace_view(:latest_verification_ids_for_consumer_version_tags,
+      LATEST_VERIFICATION_IDS_FOR_CONSUMER_VERSION_TAGS_V2)
+  end
+end