chore: rename latest_pact_publication_ids_by_consumer_versions to lat…

…est_pact_publication_ids_for_consumer_versions

db/migrations/20180720_create_latest_pact_publication_ids.rb

@@ -0,0 +1,24 @@
+Sequel.migration do
+  up do
+    # Latest pact_publication (revision) for each provider/consumer version.
+    # Keeping track of this in a table rather than having to calculate the
+    # latest revision speeds things up.
+    # We don't have to worry about updating it if a revision is deleted, because
+    # you can't delete a single pact revision through the API - all the revisions
+    # for a pact are deleted together when you delete the pact resource for that
+    # consumer version, and when that happens, this row will cascade delete.
+    create_table(:latest_pact_publication_ids_for_consumer_versions, charset: 'utf8') do
+      foreign_key :consumer_id, :pacticipants, null: false, on_delete: :cascade # redundant, but speeds up queries by removing need for extra join
+      foreign_key :consumer_version_id, :versions, null: false, on_delete: :cascade
+      foreign_key :provider_id, :pacticipants, null: false, on_delete: :cascade
+      foreign_key :pact_publication_id, :pact_publications, null: false, on_delete: :cascade, unique: true
+      foreign_key :pact_version_id, :pact_versions, null: false, on_delete: :cascade
+      index [:provider_id, :consumer_version_id], unique: true, name: "unq_latest_ppid_prov_conver"
+      index [:provider_id, :consumer_id], name: "lpp_provider_id_consumer_id_index"
+    end
+  end
+
+  down do
+    drop_table(:latest_pact_publication_ids_for_consumer_versions)
+  end
+end