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reflect.go
67 lines (52 loc) · 1.38 KB
/
reflect.go
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package pgrst
import (
"encoding/json"
"fmt"
"reflect"
)
func setOutput(input []byte, output any) (err error) {
// if either parameters are null, return immediately
if nil == input || nil == output {
return nil
}
//fmt.Println(string(input))
//fmt.Println(reflect.ValueOf(output).Elem().Kind())
oKind := reflect.ValueOf(output).Elem()
switch oKind.Kind() {
case reflect.String:
inputStr := string(input)
if inputStr != "null" {
oKind.Set(reflect.ValueOf(inputStr))
}
case reflect.Slice:
err = json.Unmarshal(input, output)
if nil != err {
return fmt.Errorf("error unmarshaling input to slice output: %w", err)
}
case reflect.Struct, reflect.Map:
var rMap ([]map[string]any)
//fmt.Println(string(input))
err = json.Unmarshal(input, &rMap)
if nil != err {
return fmt.Errorf("error unmarshaling input to map: %w", err)
}
// if there isn't EXACTLY one entry in the result, we return immediately
if len(rMap) != 1 {
return
}
bytes, err := json.Marshal(rMap[0])
if nil != err {
return fmt.Errorf("error marshaling map: %w", err)
}
/*
to unmarshal slices, write a custom json unmarshal to convert the
string value to a specific slice type in the struct.
*/
//fmt.Println(string(bytes))
err = json.Unmarshal(bytes, output)
if nil != err {
return fmt.Errorf("error unmarshaling map to output: %w", err)
}
}
return nil
}