symfony cannt join related tables in manytomany relationship - mysql

Question

I cannot join tables(Products and Category) in ManyToMany relationship.
My Entities
I get this error message when I try to join them
[Syntax Error] line 0, col 511: Error: Expected Literal, got 'JOIN'
My Repository
public function GetProductsList($productid){
$fields = array['product.product','category.category']
$query = $this->getEntityManager()->createQueryBuilder()
->select($fields)
->from('TestMyBundle:product','product')
->innerJoin('TestMyBundle:category','category')
->where('product.productid=:productid')
->setParameter('productid',$productid)
->getQuery()
->getResult();
return $query;
}

Answer 1

Your join looks wrong and I don't see why you need an hardcoded array there. May as well just put the entity aliases directly in the select. I would write that as:
public function GetProductsList($productid){
$result = $this->getEntityManager()->createQueryBuilder()
->select('product', 'category')
->from('TestMyBundle:product','product')
->join('product.categories','category') // making an assumption your product entity has getCategories()
->where('product.productid=:productid')
->setParameter('productid',$productid)
->getQuery()
->getResult();
return $result;
}
Should work then.
Note that when you get problems like this it's useful to do something like ->getSQL() instead of getQuery() and var_dump the SQL to see what the querybuilder is producing, makes it easier to debug.