Method incr

strings.go:228–247

(key string, value Value)

}

func (c Client) incr(key string, value Value) (newValue ReturnValue, err error) {
	builder := newExpresionBuilder()
	builder.keys[vk] = struct{}{}
	resp, err := c.ddbClient.UpdateItemRequest(&dynamodb.UpdateItemInput{
		ExpressionAttributeNames: builder.expressionAttributeNames(),
		ExpressionAttributeValues: map[string]dynamodb.AttributeValue{
			":delta": value.ToAV(),
		},
		Key:              keyDef{pk: key, sk: emptySK}.toAV(c),
		ReturnValues:     dynamodb.ReturnValueAllNew,
		TableName:        aws.String(c.table),
		UpdateExpression: aws.String("ADD #val :delta"),
	}).Send(context.TODO())

	if err == nil {
		newValue = ReturnValue{resp.UpdateItemOutput.Attributes[vk]}
	}

	return
}

// INCR increments the number stored at the key by 1 (n = n + 1) and returns the new value. If the
// key does not exist, it will be initialized with zero before applying the operation.