EAV - create a new form attribute

How to implement creation of a new form attribute (EAV) of a specific type?

Following snippet creates a new EAV with the code and name "mailType" in the main IdmIdentity form definition. The values of the EAV attribute will be taken from a code list with the code "possibleMailTypes".

IdmFormDefinitionDto mainDefinition = formService.getDefinition(IdmIdentity.class);

IdmFormAttributeDto eavAttribute = new IdmFormAttributeDto();
eavAttribute.setCode("mailType");
eavAttribute.setFormDefinition(mainDefinition.getId());
eavAttribute.setName("mailType");
eavAttribute.setConfidential(false);
eavAttribute.setRequired(false);
eavAttribute.setReadonly(false);
eavAttribute.setPersistentType(PersistentType.CODELIST);
eavAttribute.setFaceType("possibleMailTypes");
formAttributeService.save(eavAttribute);