func fieldAssignmentTypeToModel(model *RelationalModelDefinition, ut *design.UserTypeDefinition, utype, mtype string) string {
// Get a sortable slice of field names
var keys []string
for k := range model.RelationalFields {
keys = append(keys, k)
}
sort.Strings(keys)
var fieldAssignments []string
for _, fname := range keys {
field := model.RelationalFields[fname]
var mpointer, upointer bool
mpointer = field.Nullable
obj := ut.ToObject()
definition := ut.Definition()
if field.Datatype == "" {
continue
}
for key := range obj {
gfield := obj[key]
if field.Underscore() == key || field.DatabaseFieldName == key {
// this is our field
if gfield.Type.IsObject() || definition.IsPrimitivePointer(key) {
upointer = true
} else {
// set it explicitly because we're reusing the same bool
upointer = false
}
var prefix string
if upointer != mpointer {
prefix = "*"
}
fa := fmt.Sprintf("\t%s.%s = %s%s.%s", mtype, fname, prefix, utype, codegen.Goify(key, true))
fieldAssignments = append(fieldAssignments, fa)
}
}
}
return strings.Join(fieldAssignments, "\n")
}
// GoTypeTransform produces Go code that initializes the data structure defined by target from an
// instance of the data structure described by source. The algorithm matches object fields by name
// or using the value of the "transform:key" attribute metadata when present.
// The function returns an error if target is not compatible with source (different type, fields of
// different type etc). It ignores fields in target that don't have a match in source.
func GoTypeTransform(source, target *design.UserTypeDefinition, targetPkg, funcName string) (string, error) {
var impl string
var err error
switch {
case source.IsObject():
if !target.IsObject() {
return "", fmt.Errorf("source is an object but target type is %s", target.Type.Name())
}
impl, err = transformObject(source.ToObject(), target.ToObject(), targetPkg, target.TypeName, "source", "target", 1)
case source.IsArray():
if !target.IsArray() {
return "", fmt.Errorf("source is an array but target type is %s", target.Type.Name())
}
impl, err = transformArray(source.ToArray(), target.ToArray(), targetPkg, "source", "target", 1)
case source.IsHash():
if !target.IsHash() {
return "", fmt.Errorf("source is a hash but target type is %s", target.Type.Name())
}
impl, err = transformHash(source.ToHash(), target.ToHash(), targetPkg, "source", "target", 1)
default:
panic("cannot transform primitive types") // bug
}
if err != nil {
return "", err
}
t := GoTypeRef(target, nil, 0)
if strings.HasPrefix(t, "*") && len(targetPkg) > 0 {
t = fmt.Sprintf("*%s.%s", targetPkg, t[1:])
}
data := map[string]interface{}{
"Name": funcName,
"Source": source,
"Target": target,
"TargetRef": t,
"TargetPkg": targetPkg,
"Impl": impl,
}
return RunTemplate(transformT, data), nil
}