{"id":205160,"date":"2025-05-29T17:42:38","date_gmt":"2025-05-29T09:42:38","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205160\/"},"modified":"2025-05-29T17:42:38","modified_gmt":"2025-05-29T09:42:38","slug":"%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96pydantic%e6%a8%a1%e5%9e%8b%e5%ad%97%e6%ae%b5%e7%9a%84max_length%e5%80%bc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205160\/","title":{"rendered":"\u5982\u4f55\u83b7\u53d6Pydantic\u6a21\u578b\u5b57\u6bb5\u7684max_length\u503c\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u83b7\u53d6Pydantic\u6a21\u578b\u5b57\u6bb5\u7684max_length\u503c\uff1f<\/h1>\n<p>\u5728\u6587\u7ae0\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300a\u5982\u4f55\u83b7\u53d6Pydantic\u6a21\u578b\u5b57\u6bb5\u7684max_length\u503c\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241124\/173245827767433725e12ec.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong> \u5982\u4f55\u901a\u8fc7\u4ee3\u7801\u8bbf\u95ee pydantic \u6a21\u578b\u4e2d\u7279\u5b9a\u5b57\u6bb5\u7684 max_length \u503c\uff1f<\/p>\n<p><strong>\u80cc\u666f\uff1a<\/strong> pydantic \u662f\u4e00\u4e2a\u7528\u4e8e\u6570\u636e\u9a8c\u8bc1\u548c\u6a21\u578b\u5b9a\u4e49\u7684 python \u5e93\u3002\u5176\u5b57\u6bb5\u5143\u6570\u636e\u4e2d\u5305\u542b\u5b57\u6bb5\u7684\u957f\u5ea6\u9650\u5236\u4fe1\u606f\uff0c\u4f8b\u5982 max_length\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p><strong>pydantic v1\uff1a<\/strong><\/p>\n<pre>from pydantic import BaseModel, Field\n\nclass MetaCollection(BaseModel):\n    # ... \u5176\u4ed6\u5b57\u6bb5\n\n    description: str | None = Field(None, max_length=1024)\n\n# \u83b7\u53d6 description \u5b57\u6bb5\u7684 max_length\ndescription_max_length = MetaCollection.__fields__[\"description\"].field_info.max_length<\/pre>\n<p><strong>pydantic v2\uff1a<\/strong><\/p>\n<p>\u8bf7\u53c2\u9605 github \u8ba8\u8bba\u4ee5\u4e86\u89e3\u5982\u4f55\u83b7\u53d6 pydantic v2 \u4e2d\u7684\u5b57\u6bb5\u5143\u6570\u636e https:\/\/github.com\/pydantic\/pydantic\/discussions\/8388<\/p>\n<p>\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u83b7\u53d6Pydantic\u6a21\u578b\u5b57\u6bb5&#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-205160","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205160","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=205160"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205160\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}