{"id":204673,"date":"2025-05-29T08:28:18","date_gmt":"2025-05-29T00:28:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204673\/"},"modified":"2025-05-29T08:28:18","modified_gmt":"2025-05-29T00:28:18","slug":"pydantic-%e5%ba%93-validator-%e7%9a%84-per-%e5%8f%82%e6%95%b0%ef%bc%9a%e5%a6%82%e4%bd%95%e7%a1%ae%e4%bf%9d%e9%aa%8c%e8%af%81%e6%96%b9%e6%b3%95%e7%9a%84%e6%ad%a3%e7%a1%ae%e6%89%a7%e8%a1%8c%e9%a1%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204673\/","title":{"rendered":"pydantic \u5e93 validator \u7684 per \u53c2\u6570\uff1a\u5982\u4f55\u786e\u4fdd\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6b63\u786e\u6267\u884c\u987a\u5e8f\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>pydantic \u5e93 validator \u7684 per \u53c2\u6570\uff1a\u5982\u4f55\u786e\u4fdd\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6b63\u786e\u6267\u884c\u987a\u5e8f\uff1f<\/h1>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300apydantic \u5e93 validator \u7684 per \u53c2\u6570\uff1a\u5982\u4f55\u786e\u4fdd\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6b63\u786e\u6267\u884c\u987a\u5e8f\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241112\/173142361567336d7fa21a0.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>pydantic \u5e93 validator \u7684 per \u53c2\u6570\u95ee\u9898<\/strong><\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u5728\u4f7f\u7528 pydantic \u5e93\u7684 validator \u88c5\u9970\u5668\u65f6\uff0c\u5c06 per \u53c2\u6570\u8bbe\u7f6e\u4e3a true \u5e76\u4e0d\u662f\u671f\u671b\u7684\u9a8c\u8bc1\u65b9\u6cd5\u6267\u884c\u987a\u5e8f\u3002<\/p>\n<p><strong>\u7b54\u6848\uff1a<\/strong><\/p>\n<p>per \u53c2\u6570\u65e8\u5728\u8bbe\u7f6e\u9a8c\u8bc1\u5668\u65b9\u6cd5\u7684\u6267\u884c\u987a\u5e8f\uff1a<\/p>\n<ul>\n<li>true\uff1a\u5728\u6807\u51c6\u9a8c\u8bc1\u5668\u4e4b\u524d\u8c03\u7528<\/li>\n<li>false\uff1a\u5728\u6807\u51c6\u9a8c\u8bc1\u5668\u4e4b\u540e\u8c03\u7528<\/li>\n<\/ul>\n<p>\u4f46\u662f\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u4f1a\u9047\u5230 per \u53c2\u6570\u7684\u6267\u884c\u987a\u5e8f\u4e0e\u9884\u671f\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002<\/p>\n<p><strong>\u539f\u56e0\uff1a<\/strong><\/p>\n<p>\u8fd9\u53ef\u80fd\u662f\u56e0\u4e3a\u4f60\u6ca1\u6709\u9075\u5faa\u5b98\u65b9\u6307\u5357\u4e2d\u63a8\u8350\u7684\u9a8c\u8bc1\u65b9\u6cd5\u653e\u7f6e\u987a\u5e8f\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n<p>\u4e3a\u4e86\u786e\u4fdd\u6b63\u786e\u7684\u6267\u884c\u987a\u5e8f\uff0c\u8bf7\u9075\u5faa\u4ee5\u4e0b\u51c6\u5219\uff1a<\/p>\n<ol>\n<li>\u5c06\u5e26\u6709 per=true \u7684\u9a8c\u8bc1\u5668\u653e\u5728\u9a8c\u8bc1\u65b9\u6cd5\u5b9a\u4e49\u7684\u5f00\u5934\u3002<\/li>\n<li>\u9075\u5faa\u6b64\u987a\u5e8f\uff1apre \u9a8c\u8bc1\u5668 -&gt; \u6807\u51c6\u9a8c\u8bc1\u5668 -&gt; post \u9a8c\u8bc1\u5668<\/li>\n<\/ol>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>from pydantic import BaseModel, validator, ValidationError\n\nclass UserModel(BaseModel):\n    name: str\n    username: str\n    password1: str\n    password2: str\n\n    @validator('username', pre=True)  # \u653e\u5728\u5f00\u5934\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\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\nuser = UserModel(\n    name='samuel colvin',\n    username='scolvin',\n    password1='zxcvbn',\n    password2='zxcvbn',\n)<\/pre>\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u5b58\u5728\u51b2\u7a81\uff0c\u5219\u53ef\u4ee5\u5728 pre \u548c post \u4e2d\u4f7f\u7528\u591a\u4e2a\u9a8c\u8bc1\u5668\u3002<\/li>\n<li>\u5982\u679c\u5e0c\u671b\u9a8c\u8bc1\u5668\u59cb\u7ec8\u5728\u6807\u51c6\u9a8c\u8bc1\u5668\u4e4b\u540e\u8fd0\u884c\uff0c\u53ef\u4ee5\u7701\u7565 per \u53c2\u6570\uff08\u9ed8\u8ba4\u4e3a false\uff09\u3002<\/li>\n<\/ul>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300apydantic \u5e93 validator \u7684 per \u53c2\u6570\uff1a\u5982\u4f55\u786e\u4fdd\u9a8c\u8bc1\u65b9\u6cd5\u7684\u6b63\u786e\u6267\u884c\u987a\u5e8f\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>pydantic \u5e93 valid&#46;&#46;&#46;<\/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-204673","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204673","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=204673"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204673\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204673"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204673"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}