push human readable milestone type

internal/repository/milestone/type.go

@@ -2,6 +2,11 @@
 
 package milestone
 
+import (
+	"fmt"
+	"strings"
+)
+
 type Type int
 
 const (
@@ -24,3 +29,31 @@ func AllTypes() []Type {
 	}
 	return types
 }
+
+func (t *Type) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`"%s"`, t.String())), nil
+}
+
+func (t *Type) UnmarshalJSON(data []byte) error {
+	*t = typeFromString(strings.Trim(string(data), `"`))
+	return nil
+}
+
+func typeFromString(t string) Type {
+	switch t {
+	case InstanceCreated.String():
+		return InstanceCreated
+	case AuthenticationSucceededOnInstance.String():
+		return AuthenticationSucceededOnInstance
+	case ProjectCreated.String():
+		return ProjectCreated
+	case ApplicationCreated.String():
+		return ApplicationCreated
+	case AuthenticationSucceededOnApplication.String():
+		return AuthenticationSucceededOnApplication
+	case InstanceDeleted.String():
+		return InstanceDeleted
+	default:
+		return unknown
+	}
+}