dynamodb/type_func.go
package dynamodb
import (
SDK "github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/dynamodbattribute"
)
const defaultStructTag = "dynamodb"
// MarshalFromMap converts result AttributeValue to slice of map values.
func MarshalFromMap(o map[string]interface{}) (map[string]AttributeValue, error) {
m, err := dynamodbattribute.MarshalMap(o)
if err != nil {
return nil, err
}
return newAttributeValueMap(m), nil
}
// MarshalToMap converts result AttributeValue to map values.
func MarshalToMap(in interface{}) (map[string]AttributeValue, error) {
out, err := RawMarshal(in, defaultStructTag)
if err != nil {
return nil, err
}
if out != nil {
return newAttributeValueMap(out.M), nil
}
return nil, nil
}
// MarshalToMap converts result AttributeValue to list values.
func MarshalToList(in interface{}) ([]AttributeValue, error) {
out, err := RawMarshal(in, defaultStructTag)
if err != nil {
return nil, err
}
if out != nil {
return newAttributeValueList(out.L), nil
}
return nil, nil
}
func RawMarshal(in interface{}, structTag string) (*SDK.AttributeValue, error) {
encoder := dynamodbattribute.NewEncoder()
encoder.TagKey = structTag
return encoder.Encode(in)
}
// ToSliceMapValues converts result AttributeValue to slice of map values.
func ToSliceMapValues(o []map[string]SDK.AttributeValue) []map[string]interface{} {
list := make([]map[string]interface{}, len(o))
for i, item := range o {
var v map[string]interface{}
_ = dynamodbattribute.UnmarshalMap(item, &v)
list[i] = v
}
return list
}
// ToMapValue converts result AttributeValue to map value.
func ToMapValue(o map[string]AttributeValue) map[string]interface{} {
m := make(map[string]SDK.AttributeValue, len(o))
for key, val := range o {
m[key] = val.ToSDK()
}
var v map[string]interface{}
_ = dynamodbattribute.UnmarshalMap(m, &v)
return v
}
// Unmarshal unmarshals given slice pointer sturct from DynamoDB item result to mapping.
// e.g. err = Unmarshal(&[]*yourStruct)
// The struct tag `dynamodb:""` is used to unmarshal.
func RawUnmarshalAttributeValues(items []map[string]SDK.AttributeValue, out interface{}) error {
return RawUnmarshalWithTagName(items, out, defaultStructTag)
}
// RawUnmarshalWithTagName unmarshals given slice pointer sturct and tag name from DynamoDB item result to mapping.
func RawUnmarshalWithTagName(items []map[string]SDK.AttributeValue, out interface{}, structTag string) error {
if len(items) == 0 {
return nil
}
decoder := dynamodbattribute.NewDecoder()
decoder.TagKey = structTag
list := make([]SDK.AttributeValue, len(items))
for i, m := range items {
list[i] = SDK.AttributeValue{M: m}
}
err := decoder.Decode(&SDK.AttributeValue{L: list}, out)
return err
}