91 lines
1.6 KiB
Go
91 lines
1.6 KiB
Go
package entity
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import (
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"fmt"
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"reflect"
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)
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// Values is a shortcut for map[string]interface{}
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type Values map[string]interface{}
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// ModelValues extracts Values from an entity model.
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func ModelValues(m interface{}, keyNames ...string) (result Values, keys []interface{}, err error) {
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isKey := func(name string) bool {
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for _, s := range keyNames {
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if name == s {
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return true
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}
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}
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return false
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}
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r := reflect.ValueOf(m)
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if r.Kind() != reflect.Pointer {
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return result, keys, fmt.Errorf("model interface expected")
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}
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values := r.Elem()
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if kind := values.Kind(); kind != reflect.Struct {
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return result, keys, fmt.Errorf("model expected")
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}
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t := values.Type()
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num := t.NumField()
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keys = make([]interface{}, 0, len(keyNames))
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result = make(map[string]interface{}, num)
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// Add exported fields to result.
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for i := 0; i < num; i++ {
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field := t.Field(i)
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// Skip non-exported fields.
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if !field.IsExported() {
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continue
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}
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fieldName := field.Name
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// Skip timestamps.
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if fieldName == "" || fieldName == "UpdatedAt" || fieldName == "CreatedAt" {
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continue
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}
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v := values.Field(i)
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switch v.Kind() {
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case reflect.Slice, reflect.Chan, reflect.Func, reflect.Map, reflect.UnsafePointer:
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continue
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case reflect.Struct:
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if v.IsZero() {
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continue
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}
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}
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// Skip read-only fields.
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if !v.CanSet() {
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continue
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}
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// Skip keys.
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if isKey(fieldName) {
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if !v.IsZero() {
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keys = append(keys, v.Interface())
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}
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continue
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}
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// Add value to result.
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result[fieldName] = v.Interface()
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}
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if len(result) == 0 {
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return result, keys, fmt.Errorf("no values")
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}
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return result, keys, nil
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}
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