qor/qor

package resource

import (
    "reflect"

    "github.com/qor/qor"
)

// MetaValues is slice of MetaValue
type MetaValues struct {
    Values []*MetaValue
}

// Get get meta value from MetaValues with name
func (mvs MetaValues) Get(name string) *MetaValue {
    for _, mv := range mvs.Values {
        if mv.Name == name {
            return mv
        }
    }

    return nil
}

// MetaValue a struct used to hold information when convert inputs from HTTP form, JSON, CSV files and so on to meta values
// It will includes field name, field value and its configured Meta, if it is a nested resource, will includes nested metas in its MetaValues
type MetaValue struct {
    Name       string
    Value      interface{}
    Index      int
    Meta       Metaor
    MetaValues *MetaValues
}

func decodeMetaValuesToField(res Resourcer, field reflect.Value, metaValue *MetaValue, context *qor.Context) {
    if field.Kind() == reflect.Struct {
        value := reflect.New(field.Type())
        associationProcessor := DecodeToResource(res, value.Interface(), metaValue.MetaValues, context)
        associationProcessor.Start()
        if !associationProcessor.SkipLeft {
            field.Set(value.Elem())
        }
    } else if field.Kind() == reflect.Slice {
        if metaValue.Index == 0 {
            field.Set(reflect.Zero(field.Type()))
        }

        var fieldType = field.Type().Elem()
        var isPtr bool
        if fieldType.Kind() == reflect.Ptr {
            fieldType = fieldType.Elem()
            isPtr = true
        }

        value := reflect.New(fieldType)
        associationProcessor := DecodeToResource(res, value.Interface(), metaValue.MetaValues, context)
        associationProcessor.Start()
        if !associationProcessor.SkipLeft {
            if !reflect.DeepEqual(reflect.Zero(fieldType).Interface(), value.Elem().Interface()) {
                if isPtr {
                    field.Set(reflect.Append(field, value))
                } else {
                    field.Set(reflect.Append(field, value.Elem()))
                }
            }
        }
    }
}