如何创建具有最大和最小限制的Django FloatField？ [英] How to create a Django FloatField with maximum and minimum limits?

问题描述

我正在Django模型中存储一些浮点数据，并且只有一定范围的值才有意义。因此，我想在模型和SQL约束级别上施加这些限制。

I'm storing some floating-point data in my Django models, and only a certain range of values are meaningful. Therefore, I'd like to impose these limits at both the model and SQL constraint level.

例如，我想做这样的事情：

For example, I'd like to do something like this:

class Foo(Model):
   myfloat = FloatField(min=0.0, max=1.0)

我想在模型级别而不是表单级别执行此操作。实际上，我可能希望表单级别具有不同的范围。例如，在表单级别使用百分比[0,100]，但在模型中将其转换为[0,1]。

I want to do this at the model level, not the form level. In fact, I might like the form level to have a different range; e.g., use percentages [0,100] at the form level but translate to [0,1] in the model.

这是否可行？如果可以，我该怎么做

Is this possible, and if so, how would I go about doing it?

推荐答案

到目前为止的答案描述了如何使表单生效。您也可以将验证器放入模型中。使用 MinValueValidator 和 MaxValueValidator 。

The answers so far describe how to make forms validate. You can also put validators in the model. Use MinValueValidator and MaxValueValidator.

例如：

from django.core.validators import MaxValueValidator, MinValueValidator

...
weight = models.FloatField(
    validators=[MinValueValidator(0.9), MaxValueValidator(58)],
)

我不认为这会增加SQL约束。

I don't think that adds SQL constraints, tho.

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