Add extra SELECT expression result to the existing entity - php

Question

I have the project that allows to rate a company in many aspects. The following diagram could help you to understand the relations in my database. Of course, I have deleted from the scheme the fields, that are not important in the context of my problem.
Currently, in my repository class of the Company entity, I am searching for companies using QueryBuilder and returning an instance of \Doctrine\ORM\Tools\Pagination\Paginator.
The below code is responsible for fetching companies:
public function search(CompanySearchQuery $command): Paginator
{
$qb = $this->createQueryBuilder('c')
->setFirstResult($command->getOffset())
->setMaxResults($command->getMaxResults())
->orderBy('c.name', 'ASC');
... plus extra "where" conditions
return new Paginator($qb, true);
}
I wonder how I can attach the average score to each company using QueryBuilder and Paginator.
Here is the native SQL that allows me to get data I need:
SELECT
c.id,
c.name,
AVG(o2.score) as score
FROM
company c
LEFT JOIN
opinion o ON c.id = o.company_id
LEFT JOIN
opinion_scope o2 ON o.id = o2.opinion_id
GROUP BY
c.id
My question is: Is it possible to add averageScore property to the Company class and map it from QueryBuilder result?
I tried to rewrite my SQL query to use with the existing code:
$qb = $this->createQueryBuilder('c')
->select('c', 'AVG(s.score)')
->leftJoin('c.opinions', 'o')
->leftJoin('o.scopes', 's')
->groupBy('c.id')
->setFirstResult($command->getOffset())
->setMaxResults($command->getMaxResults())
->orderBy('c.name', 'ASC')
;
With the above code I get database exception as following:
SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #14 of
SELECT list is not in GROUP BY clause and contains nonaggregated column
'database.o1_.score' which is not functionally dependent on columns in GROUP BY
clause; this is incompatible with sql_mode=only_full_group_by").
The SQL query that is executed for the above QueryBuilder is:
SELECT
DISTINCT id_8
FROM
(
SELECT
DISTINCT id_8,
name_9
FROM
(
SELECT
c0_.updated_at AS updated_at_0,
c0_.description AS description_1,
c0_.website AS website_2,
c0_.email AS email_3,
c0_.phone AS phone_4,
c0_.street AS street_5,
c0_.postal_code AS postal_code_6,
c0_.city AS city_7,
c0_.id AS id_8,
c0_.name AS name_9,
c0_.slug AS slug_10,
c0_.created_at AS created_at_11,
AVG(o1_.score) AS sclr_12,
o1_.score AS score_13,
o1_.opinion_id AS opinion_id_14,
o1_.type_id AS type_id_15
FROM
company c0_
LEFT JOIN opinion o2_ ON c0_.id = o2_.company_id
LEFT JOIN opinion_scope o1_ ON o2_.id = o1_.opinion_id
GROUP BY
c0_.id
) dctrn_result_inner
ORDER BY
name_9 ASC
) dctrn_result
LIMIT
2 OFFSET 0
I do not understand why Doctrine adds the following fragment:
o1_.score AS score_13,
o1_.opinion_id AS opinion_id_14,
o1_.type_id AS type_id_15

Answer 1

The issue seems to be that you're trying to select every column from 'c', which is your resulting table from performing two LEFT JOINs. Instead, you need to be specifying a from clause for the company table:
$qb = $this->createQueryBuilder()
->select('c', 'AVG(s.score)')
->from('company', 'c')
->leftJoin('c.opinions', 'o')
->leftJoin('o.scopes', 's')
->groupBy('c.id')
->setFirstResult($command->getOffset())
->setMaxResults($command->getMaxResults())
->orderBy('c.name', 'ASC')
;
This will avoid including o1.score is your returned columns, which is what that error is referencing