// recordType is the type of a structure
func (sess *Session) calculateFieldMap(recordType reflect.Type, columns []string, requireAllColumns bool) ([][]int, error) {
// each value is either the slice to get to the field via FieldByIndex(index []int) in the record, or nil if we don't want to map it to the structure.
lenColumns := len(columns)
fieldMap := make([][]int, lenColumns)
for i, col := range columns {
fieldMap[i] = nil
queue := []fieldMapQueueElement{{Type: recordType, Idxs: nil}}
QueueLoop:
for len(queue) > 0 {
curEntry := queue[0]
queue = queue[1:]
curType := curEntry.Type
curIdxs := curEntry.Idxs
lenFields := curType.NumField()
for j := 0; j < lenFields; j++ {
fieldStruct := curType.Field(j)
// Skip unexported field
if len(fieldStruct.PkgPath) != 0 {
continue
}
name := fieldStruct.Tag.Get("db")
if name != "-" {
if name == "" {
name = util.CamelCaseToUnderscore(fieldStruct.Name)
}
if name == col {
fieldMap[i] = append(curIdxs, j)
break QueueLoop
}
}
if fieldStruct.Type.Kind() == reflect.Struct {
var idxs2 []int
copy(idxs2, curIdxs)
idxs2 = append(idxs2, j)
queue = append(queue, fieldMapQueueElement{Type: fieldStruct.Type, Idxs: idxs2})
}
}
}
if requireAllColumns && fieldMap[i] == nil {
return nil, errors.New(fmt.Sprint("couldn't find match for column ", col))
}
}
return fieldMap, nil
}
func TestCamelCaseToUnderscore(t *testing.T) {
tests := []struct {
in string
out string
}{
{"CatalogProductEntity", "catalog_product_entity"},
{"CatalogPPoductEntity", "catalog_p_poduct_entity"},
{"catalogProductEntityE", "catalog_product_entity_e"},
{" catalogProductEntityE", " catalog_product_entity_e"},
{" CatalogProductEntityE", " _catalog_product_entity_e"}, // the leading underscore is a bug ... :-\
}
for _, test := range tests {
assert.Equal(t, test.out, util.CamelCaseToUnderscore(test.in), "%#v", test)
}
}
// BenchmarkCamelCaseToUnderscore-4 2000000 928 ns/op 288 B/op 6 allocs/op
func BenchmarkCamelCaseToUnderscore(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
benchCases = util.CamelCaseToUnderscore("CatalogPPoductEntity")
}
}