英文:
Programmatic (Python) format check in jsonschema
问题
我有一个模式，其中一个属性应该符合只能以编程方式检查的模式：
type: object
properties:
unit:
description: 此列的单位。必须符合FITS规范。
type: string
其中，“FITS符合性”可以通过一个小的Python代码片段来确保（在失败时引发异常）：
import astropy.units as u
u.Unit(col["unit"], format=u.format.Fits)
似乎可以使用属性的自定义“format”属性来完成此操作：
type: object
properties:
unit:
description: 此列的单位。必须符合FITS规范。
type: string
format: fitsunit
然后，使用装饰器 jsonschema.FormatChecker.checks 来实现格式检查器。但是，我找不到如何编写这个检查器的方法。
英文:
I have a schema where a property should comply to a pattern that only can be checked programmatically:
type: object
properties:
unit:
description: Unit of this column. Must be FITS conform.
type: string
where "FITS conformity" can be ensured by a small Python snippet (which raises an exception on fail):
import astropy.units as u
u.Unit(col["unit"], format=u.format.Fits)
It seems that this could be done with a custom "format" attribute of the property:
type: object
properties:
unit:
description: Unit of this column. Must be FITS conform.
type: string
format: fitsunit
and then implement a format checker with the decorator jsonschema.FormatChecker.checks. However, I could not find out how to write this.
答案1
得分: 0
我终于自己找到了这个。装饰器用于一个简单的检查函数，该函数接受一个单一的参数：
from jsonschema import validate, Draft202012Validator
@Draft202012Validator.FORMAT_CHECKER.checks("fitsunit", ValueError)
def check_fitsunit(s):
import astropy.units as u
u.Unit(s, format=u.format.Fits)
return True
validate(my_file, my_schema, format_checker=Draft202012Validator.FORMAT_CHECKER)
英文:
I finally found this out myself. The decorator is used for a simple checker function, that takes one single argument:
from jsonschema import validate, Draft202012Validator
@Draft202012Validator.FORMAT_CHECKER.checks("fitsunit", ValueError)
def check_fitsunit(s):
import astropy.units as u
u.Unit(s, format=u.format.Fits)
return True
validate(my_file, my_schema, format_checker=Draft202012Validator.FORMAT_CHECKER)
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