我需要在几个表单中使用相同的自定义验证。在其他框架中,我会创建一个新的“Validator”类,但我不确定Django/Python的最佳选择。在
下面是我所做的,有没有更好的方法(下面的解决方案)?在
以任何形式:
def clean_image(self):
image = self.cleaned_data.get("image")
return validate_image_with_dimensions(
image,
expected_width=965,
expected_height=142
)
在验证模块中
^{pr2}$以下是解决方案:
以形式:
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
)
]
)
在验证模块中:
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)
)
表单和模型字段accept a list of validators:
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)。在
要获得灵感,请看django.core.validators source。在
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