GRAILS-10979 - Fix support for binding to a collection of enum

grails-databinding/src/main/groovy/org/grails/databinding/SimpleDataBinder.groovy

@@ -318,6 +318,9 @@ class SimpleDataBinder implements DataBinder {
                         indexedInstance = genericType.newInstance()
                         bind indexedInstance, val, listener
                         addElementToCollectionAt obj, propName, collectionInstance, index, indexedInstance
+                    } else if(genericType.isEnum() && val instanceof CharSequence) {
+                        def enumValue = convertStringToEnum(genericType, val.toString())
+                        addElementToCollectionAt obj, propName, collectionInstance, index, enumValue
                     }
                 } else {
                     addElementToCollectionAt obj, propName, collectionInstance, index, val

grails-databinding/src/test/groovy/org/grails/databinding/SimpleDataBinderEnumBindingSpec.groovy

@@ -0,0 +1,30 @@
+package org.grails.databinding
+
+import spock.lang.Issue
+import spock.lang.Specification
+
+class SimpleDataBinderEnumBindingSpec extends Specification {
+    @Issue('GRAILS-10979')
+    void 'Test binding to a List of enum'() {
+        given:
+        def binder = new SimpleDataBinder()
+        def holder = new HatSizeHolder()
+
+        when:
+        binder.bind holder, ['sizes[0]': 'LARGE', 'sizes[1]': 'SMALL'] as SimpleMapDataBindingSource
+
+        then:
+        holder.sizes?.size() == 2
+        holder.sizes[0] == HatSize.LARGE
+        holder.sizes[1] == HatSize.SMALL
+    }
+
+}
+
+enum HatSize {
+    SMALL, MEDIUM, LARGE
+}
+
+class HatSizeHolder {
+    List<HatSize> sizes
+}