CMR-8975 Fixing when migrating down to 1.17.2 and a collection doesn't have a RelatedURL that an empty element doesn't show up. (#1886)

Author: eereiter

umm-spec-lib/src/cmr/umm_spec/migration/related_url_migration.clj

@@ -411,11 +411,12 @@
   "Change application/x-vnd.iso.19139-2+xml to Not provided for the
   RelatedUrls/GetService/MimeType element."
   [related-urls]
-  (vec
-   (for [related-url related-urls
-         :let [service (:GetService related-url)]]
-     (if service
-       (if (= (:MimeType service) "application/x-vnd.iso.19139-2+xml")
-         (assoc-in related-url [:GetService :MimeType] "Not provided")
-         related-url)
-       related-url))))
+  (let [urls (for [related-url related-urls
+                   :let [service (:GetService related-url)]]
+               (if service
+                 (if (= (:MimeType service) "application/x-vnd.iso.19139-2+xml")
+                   (assoc-in related-url [:GetService :MimeType] "Not provided")
+                   related-url)
+                 related-url))]
+    (when (seq urls)
+      (vec urls))))

umm-spec-lib/src/cmr/umm_spec/migration/version/collection.clj

@@ -687,7 +687,6 @@
   [context collection & _]
   ;; if TilingIdentificationSystems Names are any but Military Grid Reference System, 
   ;; Migrate TilingIdentificationSystems/Coordinate1 and Coordinate2 from string to number.
-  (def collection collection)
   (-> collection
       (m-spec/update-version :collection "1.17.3")
       (util/update-in-all [:TilingIdentificationSystems] #(if (= "Military Grid Reference System" (:TilingIdentificationSystemName %))
@@ -700,12 +699,13 @@
 
 (defmethod interface/migrate-umm-version [:collection "1.17.3" "1.17.2"]
   [context collection & _]
-  ;; Remove the EULAIdentifiers field in UseConstraints
-  ;; Migrate TilingIdentificationSystems/Coordinate1 and Coordinate2 down if they are numbers, otherwise remove entire tiling identification system
-  (-> collection
-      (m-spec/update-version :collection "1.17.2")
-      (util/update-in-all [:TilingIdentificationSystems :Coordinate1 :MinimumValue] str)
-      (util/update-in-all [:TilingIdentificationSystems :Coordinate1 :MaximumValue] str)
-      (util/update-in-all [:TilingIdentificationSystems :Coordinate2 :MinimumValue] str)
-      (util/update-in-all [:TilingIdentificationSystems :Coordinate2 :MaximumValue] str)
-      (update :RelatedUrls related-url/migrating-down-to_1_17_2)))
+  ;; Migrate TilingIdentificationSystems/Coordinate1 and Coordinate2 down if they are numbers.
+  ;; Replace a GetService MimeType to a valid value.
+  (util/remove-nils-empty-maps-seqs
+   (-> collection
+       (m-spec/update-version :collection "1.17.2")
+       (util/update-in-all [:TilingIdentificationSystems :Coordinate1 :MinimumValue] str)
+       (util/update-in-all [:TilingIdentificationSystems :Coordinate1 :MaximumValue] str)
+       (util/update-in-all [:TilingIdentificationSystems :Coordinate2 :MinimumValue] str)
+       (util/update-in-all [:TilingIdentificationSystems :Coordinate2 :MaximumValue] str)
+       (update :RelatedUrls related-url/migrating-down-to_1_17_2))))

umm-spec-lib/test/cmr/umm_spec/test/migration/version/collection.clj

@@ -3747,7 +3747,7 @@
         (let [result (vm/migrate-umm {} :collection "1.17.3" "1.17.2" sample-collection)]
           (is (= expected result)))
 
-        "Migrating TilingIdentificationSystems Coordinate1/Coordinate2 up"
+        "Migrating TilingIdentificationSystems Coordinate1/Coordinate2 down"
         {:TilingIdentificationSystems [{:TilingIdentificationSystemName "Military Grid Reference System",
                                         :Coordinate1 {:MinimumValue "-100",
                                                       :MaximumValue "-50"},
@@ -3774,4 +3774,10 @@
                                         :Coordinate2 {:MinimumValue 1.5
                                                       :MaximumValue 10.5}}]
          :RelatedUrls [{:GetService {:MimeType "application/x-vnd.iso.19139-2+xml"}}
-                       {:GetService {:MimeType "application/json"}}]}))
+                       {:GetService {:MimeType "application/json"}}]}
+
+        "Migrating nothing down"
+        {:MetadataSpecification {:URL "https://cdn.earthdata.nasa.gov/umm/collection/v1.17.2"
+                                 :Name "UMM-C",
+                                 :Version "1.17.2"}}
+        {}))