{"id":204547,"date":"2025-05-29T12:05:50","date_gmt":"2025-05-29T04:05:50","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204547\/"},"modified":"2025-05-29T12:05:50","modified_gmt":"2025-05-29T04:05:50","slug":"pydantic-%e5%ba%93-validator-%e4%b8%ad-per-%e5%8f%82%e6%95%b0%e7%9a%84%e6%89%a7%e8%a1%8c%e9%a1%ba%e5%ba%8f%e9%97%ae%e9%a2%98%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%b0%86-per-%e8%ae%be%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204547\/","title":{"rendered":"Pydantic \u5e93 validator \u4e2d per \u53c2\u6570\u7684\u6267\u884c\u987a\u5e8f\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u5c06 per \u8bbe\u7f6e\u4e3a True \u540e\uff0c\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\u5e76\u975e\u7b2c\u4e00\u4f4d\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Pydantic \u5e93 validator \u4e2d per \u53c2\u6570\u7684\u6267\u884c\u987a\u5e8f\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u5c06 per \u8bbe\u7f6e\u4e3a True \u540e\uff0c\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\u5e76\u975e\u7b2c\u4e00\u4f4d\uff1f<\/h1>\n

\u6b22\u8fce\u5404\u4f4d\u5c0f\u4f19\u4f34\u6765\u5230\uff0c\u76f8\u805a\u4e8e\u6b64\u90fd\u662f\u7f18\u54c8\u54c8\u54c8\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u975e\u5e38\u611f\u5174\u8da3\u6216\u8005\u6b63\u5728\u81ea\u5b66\uff0c\u90fd\u53ef\u4ee5\u5173\u6ce8\u6211\uff0c\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u6587\u7ae0\uff01\u5f53\u7136\uff0c\u6709\u4ec0\u4e48\u5efa\u8bae\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u7559\u8a00\u63d0\u51fa\uff01\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

<\/p>\n

pydantic \u5e93 validator \u7684 per \u53c2\u6570\u95ee\u9898<\/strong><\/p>\n

\u95ee\u9898\uff1a<\/strong><\/p>\n

pydantic \u5e93 validator \u7684 per \u53c2\u6570\u5e94\u63a7\u5236\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\uff0c\u4f46\u5728\u6211\u5c06\u67d0\u4e2a validator \u88c5\u9970\u7684\u65b9\u6cd5\u7684 per \u53c2\u6570\u8bbe\u7f6e\u4e3a true \u4e4b\u540e\uff0c\u5176\u6267\u884c\u987a\u5e8f\u5e76\u975e\u7b2c\u4e00\u4f4d\u3002\u6c42\u89e3\u60d1\u3002<\/p>\n

\u4ee3\u7801\u793a\u4f8b\uff1a<\/strong><\/p>\n

from pydantic import BaseModel, ValidationError, validator\n\nclass UserModel(BaseModel):\n    name: str\n    username: str\n    password1:str\n    password2: str\n\n    @validator('name')\n    def name_must_contain_space(cls, v,values):\n        print(values,'name')\n        if ' ' not in v:\n            raise ValueError('must contain a space')\n        return v.title()\n\n    @validator('password2')\n    def passwords_match(cls, v, values):\n        print(values,'password2')\n        if 'password1' in values and v != values['password1']:\n            raise ValueError('passwords do not match')\n        return v\n\n    @validator('username',pre=True)\n    def username_alphanumeric(cls, v,values):\n        print(values,'\u6267\u884c\u987a\u5e8f\u4f18\u5148')\n        assert v.isalnum(), 'must be alphanumeric'\n        return v\n\nuser = UserModel(\n    name='samuel colvin',\n    username='scolvin',\n    password1='zxcvbn',\n    password2='zxcvbn',\n)<\/pre>\n
\u7b54\u6848\uff1a<\/strong><\/p>\n
\u6587\u6863\u4e2d\u786e\u5b9e\u8bf4\u660e\u4e86 per \u53c2\u6570\u7528\u4e8e\u8bbe\u7f6e validator \u9a8c\u8bc1\u65b9\u6cd5\u6267\u884c\u987a\u5e8f\u3002\u6839\u636e\u5b98\u65b9\u793a\u4f8b\uff0c\u5e94\u5c06 @validator(‘username’, pre=true) \u653e\u5728\u6821\u9a8c\u5b9a\u4e49\u7684\u8d77\u59cb\u4f4d\u7f6e\u3002<\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u8c03\u6362 validator \u7684\u987a\u5e8f\uff0c\u6216\u5728 github \u4e0a\u63d0 issue\uff1ahttps:\/\/github.com\/pydantic\/pydantic\/blob\/main\/tests\/test_validators.py<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aPydantic \u5e93 validator \u4e2d per \u53c2\u6570\u7684\u6267\u884c\u987a\u5e8f\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48\u5c06 per \u8bbe\u7f6e\u4e3a True \u540e\uff0c\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\u5e76\u975e\u7b2c\u4e00\u4f4d\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Pydantic \u5e93 valid...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-204547","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=204547"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204547\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}