Fix crash on duplicate prefill of MultipleChoiceField (fixes #1141)

web-frontend/modules/database/utils/form.js

@@ -4,7 +4,11 @@ export function getPrefills(query) {
       const keyFormatted = key
         .replace('prefill_', '') // Remove the prefix
         .replaceAll('+', ' ') // Replace + with spaces
-      prefills[keyFormatted] = query[key]
+      let valueChosen = query[key]
+      if (Array.isArray(query[key])) {
+        valueChosen = valueChosen[valueChosen.length - 1]
+      }
+      prefills[keyFormatted] = valueChosen
     }
     return prefills
   }, Object.create(null))

web-frontend/test/unit/database/utils/form.spec.js

@@ -17,6 +17,10 @@ const valuesToCall = [
     query: { 'prefill_value+with+spaces': 'value' },
     result: { 'value with spaces': 'value' },
   },
+  {
+    query: { prefill_value: ['value', 'value_2'] },
+    result: { value: 'value_2' },
+  },
 ]
 
 describe('Form utils test', () => {