Function NewMappedAttributeExpr

expr/mapped_attribute.go:33–61

NewMappedAttributeExpr instantiates a mapped attribute expression for the given attribute. The type of att must be Object.

(att *AttributeExpr)

// NewMappedAttributeExpr instantiates a mapped attribute expression for the
// given attribute. The type of att must be Object.
func NewMappedAttributeExpr(att *AttributeExpr) *MappedAttributeExpr {
	if att == nil {
		return NewEmptyMappedAttributeExpr()
	}
	if !IsObject(att.Type) {
		panic("cannot create a mapped attribute with a non object attribute") // bug
	}
	var (
		nameMap    = make(map[string]string)
		reverseMap = make(map[string]string)
		validation *ValidationExpr
	)
	if att.Validation != nil {
		validation = att.Validation.Dup()
	} else if ut, ok := att.Type.(UserType); ok {
		if val := ut.Attribute().Validation; val != nil {
			validation = val.Dup()
		}
	}
	attr := DupAtt(att)
	attr.Validation = validation
	ma := &MappedAttributeExpr{
		AttributeExpr: attr,
		nameMap:       nameMap,
		reverseMap:    reverseMap,
	}
	ma.Remap()
	return ma
}

// Remap recomputes the name mappings from the inner attribute. Use this if
// the underlying attribute is modified after the mapped attribute has been