尝试将实体与另一个实体关联会导致插入

Question

I am new to Doctrine 2 and I am trying to Create a new Transaction then try to see if that Transaction belong to any pre-existing Category. If it does then associate this Transaction to the given Category

When I run the code below at the highlighted point it should associate the Transaction to a Category. But I get the following Error which then tells me that the code is trying to add a new Category... but what I need it to do is to add a new reference in the table transactions_category (see the Picture below to see this table schema) and NOT a new Category... as that one already exists....

Its a ManyToMany association

How can I associate the two entities properly?

The Error:

An exception occurred while executing 'INSERT INTO category (name) VALUES (?)' with params ["Gyms"]:

SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'Gyms' for key 'name'

The Code

   // Get all Categories
$categoryList = $this->getEntityManager()->getRepository('Bnk\Entity\Category')->findAll();

foreach ( $CSVData as $transactionRaw )
{
    $transaction = new \Bnk\Entity\Transaction();
    $transaction->setDescription( $transactionRaw[ "description" ] );
    $transaction->setValue( $transactionRaw[ "value" ] );
    $transaction->setDate( $transactionRaw[ "date" ] );
    $transaction->setAccountnumber( $transactionRaw[ "accountNumber" ] );
    $transaction->setAccountname( $transactionRaw[ "accountName" ] );

    $this->getEntityManager()->persist( $transaction );

    // Check if there are categories
    if(!empty($categoryList))
    {
        // Loop through the categories
        /** @var \Bnk\Entity\Category $category */
        foreach( $categoryList as $category )
        {
            if( !$regexEntities = $category->getCategoryregex() )

                // Loop through the regex of a given category
                /** @var \Bnk\Entity\CategoryRegex $regex */
                foreach( $regexEntities as $regex )
                {
                    if(strpos($transactionRaw["description"],$regex->getName()) !== false)
                    {

                        // I am trying to associate the Transaction to this Category
                        // Instead this is adding the Category as if it was a new one
                        $transaction->addCategory($category);
                    }
                }
            }
        }

   $this->getEntityManager()->flush();
   $this->getEntityManager()->clear();
}

Answer 1

Try to persist your transaction and flush before adding category :

$this->getEntityManager()->persist( $transaction );
$this->getEntityManager()->flush();

//add category
$transaction->addCategory($category);
$this->getEntityManager()->persist( $transaction );
$this->getEntityManager()->flush();