Doctrine findBy and findOneBy Argument 2 passed must be an instance of […], none given

Argument 2 passed to AppBundle\Entities\WrappingPaperRepository::findWrapperInfoForProduct() must be an instance ofAppBundle\Entities\Product, none given, called in .. .php

This error sometimes occurs when converting a “findBy” call located outside the Repository into a named repository function. Whilst you can of course make repo custom function arguments also use arrays of parameters, often when writing a quick database lookup this is too much hassle and we just specify them like so:

  //Repository File
  function findInfoForProduct(Product $product) {
    // ..custom logic
  }

But this is different to how Doctrine’s findBy and findOneBy functions work – above we provide a single parameter of type product – they take an array of parameters as such:

  //Repository File
  $em->getRepository('AppBundle\Entities\Product')->findBy(['product' => $product]);

Remove the “array(” or “[” characters from your repository function call and your data retrieval service will work fine, or at least get you a bit further towards the next issue!

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