42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package services
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import (
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"errors"
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"reflect"
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"gorm.io/gorm"
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)
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func UpdateAssociations(db *gorm.DB, item interface{}) error {
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// We expect a pointer to a struct so we can do db.Model(item).
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val := reflect.ValueOf(item)
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if val.Kind() != reflect.Ptr {
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return errors.New("item must be a pointer to a struct")
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}
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elem := val.Elem()
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if elem.Kind() != reflect.Struct {
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return errors.New("item must be a pointer to a struct")
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}
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t := elem.Type()
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for i := 0; i < elem.NumField(); i++ {
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fieldVal := elem.Field(i)
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fieldType := t.Field(i)
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// Only process exported fields (capitalized) and slices.
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if fieldType.PkgPath == "" && fieldVal.Kind() == reflect.Slice {
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// For clarity, the association name is the struct field name by default.
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assocName := fieldType.Name
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// Replace the association with the current slice value.
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// If you only want to replace on non-nil or non-empty slices, you can add extra checks here.
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if err := db.Model(item).Association(assocName).Replace(fieldVal.Interface()); err != nil {
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return err
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}
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}
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}
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return nil
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}
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