表格，表格和验证 - Symfony2，Twig，Doctrine

Question

I have some questions all conected, so I will ask all of them here:

1. [Solved] I have date fields which can be nullable and when I don't fill them they are displayed as 2012-08-09 - today's date, although when I check in the database they are NULL. I have @ORM\\Column(type="date", nullable=true) and @Assert\\Date above both of them.

2. I have form validation @Assert\\Date and @Assert\\NotBlank() but I violate this constrains nothing happens although I have {{ form_errors(form) }} . How to show what exactly is wrong with the form?

3. [Solved] The last one is that I have NotBlank() constrain above a field called $currency. This is how I add it:

    $builder->add('currency', 'choice', array( 'choices' => array( 'empty_value' => '--- Choose ---', 'USD' => 'USD', 'HKD' => 'HKD'))); 

   but if I don't set anything (it stays --- Choose ---- ) it accepts it, although it's empty. I want the default choice to be --- Choose ---, but it musn't be allowed to leave it this way and the form to be valid in the same time.

I would appreciate your help!

Answer 1

For the first question, taken from the twig documentation:

If the value passed to the date filter is null, it will return the current date by default. If an empty string is desired instead of the current date, use a ternary operator:

{{ post.published_at is empty ? "" : post.published_at|date("m/d/Y") }}

Answer 2

对于第二个问题，这里有信息Symfony2：如何在将请求绑定到表单后获得表单验证错误抱歉没有找到它并质疑已经被质疑的内容。