3

我需要以多种形式使用相同的自定义验证。在其他框架中,我会创建一个新的“验证器”类,但我不确定 Django/Python 的最佳选择。

以下是我所做的,有没有更好的方法(下面的解决方案)?

任何形式

    def clean_image(self):
        image = self.cleaned_data.get("image")

        return validate_image_with_dimensions(
            image,
            expected_width=965,
            expected_height=142
        )

验证模块中

def validate_image_with_dimensions(image, expected_width, expected_height):
    from django.core.files.images import get_image_dimensions

    # the validation code...

    return image

以下是解决方案:

形式:_

    image = forms.ImageField(
        max_length=250,
        label=mark_safe('Image<br /><small>(must be 1100 x 316px)</small>'),
        required=True,
        validators=[
            ImageDimensionsValidator(
                expected_width=1100,
                expected_height=316
            )
        ]
    )

验证模块中:

class ImageDimensionsValidator(object):

    def __init__(self, expected_width, expected_height):
        self.expected_width = expected_width
        self.expected_height = expected_height

    def __call__(self, image):
        """
        Validates that the image entered have the good dimensions
        """
        from django.core.files.images import get_image_dimensions

        if not image:
            pass
        else:
            width, height = get_image_dimensions(image)
            if width != self.expected_width or height != self.expected_height:
                raise ValidationError(
                    "The image dimensions are: " + str(width) + "x" + str(height) + ". "
                    "It's supposed to be " + str(self.expected_width) + "x" + str(self.expected_height)
                )
4

1 回答 1

2

表单和模型字段接受验证器列表

class YourForm(forms.Form):
   ...
   image = forms.ImageField(validators=[validate_image_with_dimensions])

验证器是任何类型的可调用对象,请随意编写可调用类(django 内部验证器是基于类的)。

如需灵感,请查看django.core.validators source

于 2013-02-26T00:38:19.063 回答