Fix ISOTime encoding in GET requests

events.go

@@ -71,11 +71,11 @@ type ContributionEvent struct {
 // https://docs.gitlab.com/ce/api/events.html#get-user-contribution-events
 type ListContributionEventsOptions struct {
 	ListOptions
-	Action     *EventTypeValue       `json:"action,omitempty"`
-	TargetType *EventTargetTypeValue `json:"target_type,omitempty"`
-	Before     *string               `json:"before,omitempty"`
-	After      *string               `json:"after,omitempty"`
-	Sort       *string               `json:"sort,omitempty"`
+	Action     *EventTypeValue       `url:"action,omitempty" json:"action,omitempty"`
+	TargetType *EventTargetTypeValue `url:"target_type,omitempty" json:"target_type,omitempty"`
+	Before     *ISOTime              `url:"before,omitempty" json:"before,omitempty"`
+	After      *ISOTime              `url:"after,omitempty" json:"after,omitempty"`
+	Sort       *string               `url:"sort,omitempty" json:"sort,omitempty"`
 }
 
 // ListUserContributionEvents retrieves user contribution events

gitlab.go

@@ -123,6 +123,15 @@ func (t *ISOTime) UnmarshalJSON(data []byte) error {
 	return err
 }
 
+// EncodeValues implements the query.Encoder interface
+func (t *ISOTime) EncodeValues(key string, v *url.Values) error {
+	if t == nil || (time.Time(*t)).IsZero() {
+		return nil
+	}
+	v.Add(key, t.String())
+	return nil
+}
+
 // String implements the Stringer interface
 func (t ISOTime) String() string {
 	return time.Time(t).Format(iso8601)