Before all I am using Magento 2.1.2, with a custom entity.

I am trying to save multiple row in a flat table that I have created with $connection->insertMultiple($this->getMainTable(), $answers);

For that I am using the following code to populate missing row lines

$dataUserAnswer = $this->dataUserAnswerFactory->create();

$userAnswers[] = $this->dataObjectProcessor->buildOutputDataArray(

With the classes Magento\Framework\Api\DataObjectHelper and Magento\Framework\Reflection\DataObjectProcessor

Here is the result I get

[0] => array(7) {
    ["id"] => NULL
    ["poll_question_id"] => int(1)
    ["poll_answer_id"] => string(1) "1"
    ["value"] => string(0) ""
    ["customer_id"] => string(1) "1"
    ["created_at"] => NULL
    ["updated_at"] => NULL

Which is nearly what I want except for the id entry. In my Api/Data/Interface I declare a constant const ID = 'id'; with getter and setter getId() / setId($id).
I took a look at Customer module to have an exemple to build my entity.
Magento best practice is to have the primary key as entity_id.

I understand that buildOutputDataArray use Reflexion class to retrive getter and then deduce entity fields to fill missing fields.

My questions are :
- What is the best pratice for API interface constante / setter / getter ? id ? entity_id ?
- If I am taking a look at Customerentity, primary key is entity_id but constante is id. Do I miss something ? Am I doing this the wrong way ?

Hope my problem is clear.
Thank you !

1 Answer 1


I will answer my own question for people seeing this post.

I had to create setEntityId / getEntityId in my API interface and remove the getId / setId because it already exist in the parent class \Magento\Framework\Model\AbstractModel::getId so it does not matter if it is not present in the API interface.
And add the following code in my model as for Magento 1:

 * Name of object id field
 * @var string
protected $_idFieldName = 'entity_id';  

I had take a look at the wrong entity for my exemple...

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