Symfony2.1 form date field: Argument 1 passed to … must be an instance of DateTime

问题

My Entity:

/**
 * @var \DateTime $publishedAt
 *
 * @ORM\Column(name="published_at", type="date")
 * 
 * @Assert\Date()
 */
private $publishedAt;

/**
 * Set publishedAt
 *
 * @param \DateTime $publishedAt
 * @return MagazineIssue
 */
public function setPublishedAt(\DateTime $publishedAt)
{
    $this->publishedAt = $publishedAt;

    return $this;
}

/**
 * Get published_at
 *
 * @return \DateTime 
 */
public function getPublishedAt()
{
    return $this->publishedAt;
}

My form builder:

$builder->add('publishedAt');

My view:

{{ form_widget(form) }}

When I select the date in the selects and submit the form I catche the error:

Catchable Fatal Error: Argument 1 passed to ... must be an instance of DateTime, 
string given, called in .../vendor/symfony/symfony/src/Symfony/Component/Form
/Util/PropertyPath.php on line 537 and defined in ... line 214

Why it happens? If I replace the field setter with public function setPublishedAt($publishedAt) I got the error:

Fatal error: Call to a member function format() on a non-object 
in .../vendor/doctrine/dbal/lib/Doctrine/DBAL/Types/DateType.php on line 44

If I change the form builder to

 $builder->add('publishedAt','date')

all works fine. Why it happens? Why symfony can't guess it and pass to field setter the proper date format (\DateTime instead of string)?

EDIT: if I remove the @Assert\Date() then all works fine too. I think it's a sf2.1 bug with guessing the date field type

回答1:

I used to deal with this just like Max wrote but then I discovered Data transformers. It's very efficient way and does not imply modifications to model (or it's getter/setter methods)...

EDIT: Check out the title "Using Transformers in a custom field type". They write about DateTime there...

回答2:

Doctrine want to call \DateTime::format(). From a string.

You can check the argument in the setter method:

public function setPublishedAt($publishedAt)
{
    if($publishedAt instanceof \DateTime) {
        $this->publishedAt = $publishedAt;
    } else {
        $date = new \DateTime($publishedAt);
        $this->publishedAt = $date;
    }
}

回答3:

To solve this problem you can

1.change the assert from @Assert\Date() to @Assert\Type('\DateTime')

2.change the form builder to $builder->add('publishedAt','date')

3.specify the input option in the form builder: $builder->add('publishedAt',null,array('input' => 'datetime'))

来源：https://stackoverflow.com/questions/12970681/symfony2-1-form-date-field-argument-1-passed-to-must-be-an-instance-of-date

标签

symfony

symfony-forms

symfony-2.1