{"id":47747,"date":"2023-04-15T05:02:18","date_gmt":"2023-06-29T21:11:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/sangria%e4%b8%ad%e7%9a%84%e9%94%99%e8%af%af%e5%a4%84%e7%90%86\/"},"modified":"2024-04-29T23:35:12","modified_gmt":"2024-04-29T15:35:12","slug":"sangria%e4%b8%ad%e7%9a%84%e9%94%99%e8%af%af%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/sangria%e4%b8%ad%e7%9a%84%e9%94%99%e8%af%af%e5%a4%84%e7%90%86\/","title":{"rendered":"Sangria\u4e2d\u7684\u9519\u8bef\u5904\u7406"},"content":{"rendered":"<p>\u5173\u4e8e Scala \u7528\u7684 GraphQL \u5e93 Sangria \u7684\u4ee5\u4e0b\u9519\u8bef\u5904\u7406\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">(a) resolve \u51e6\u7406\u3067\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u5834\u5408<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">(b) GraphQL \u30af\u30a8\u30ea\u306b\u554f\u984c\u304c\u3042\u3063\u305f\u5834\u5408<\/ul>\n<h1>\u9996\u5148<\/h1>\n<p>\u8fd9\u6b21\u662f\u5728\u4ee5\u4e0b\u73af\u5883\u4e0b\u8fd0\u884c\u7684\u3002<\/p>\n<h5>\u6784\u5efa.sbt<\/h5>\n<pre class=\"post-pre\"><code><span class=\"nc\">ThisBuild<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">scalaVersion<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">\"3.2.1\"<\/span>\r\n\r\n<span class=\"n\">libraryDependencies<\/span> <span class=\"o\">++=<\/span> <span class=\"nc\">Seq<\/span><span class=\"o\">(<\/span>\r\n  <span class=\"s\">\"org.sangria-graphql\"<\/span> <span class=\"o\">%%<\/span> <span class=\"s\">\"sangria\"<\/span> <span class=\"o\">%<\/span> <span class=\"s\">\"3.4.1\"<\/span><span class=\"o\">,<\/span>\r\n  <span class=\"s\">\"org.sangria-graphql\"<\/span> <span class=\"o\">%%<\/span> <span class=\"s\">\"sangria-circe\"<\/span> <span class=\"o\">%<\/span> <span class=\"s\">\"1.3.2\"<\/span>\r\n<span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u5011\u4f7f\u7528sangria-circe\u4f86\u5c07GraphQL\u7684\u7d50\u679c\u4ee5JSON\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u8f38\u51fa\u3002<\/p>\n<h1>\u5982\u679c\u53d1\u751f\u5f02\u5e38\uff0c\u89e3\u51b3\u8be5\u95ee\u9898\u3002(If an exception occurs, resolve the issue.)<\/h1>\n<p>\u5982\u679c\u5728\u5904\u7406\u8fc7\u7a0b\u4e2d\u53d1\u751f\u4efb\u4f55\u5f02\u5e38\u60c5\u51b5\uff0c\u9ed8\u8ba4\u7684\u9519\u8bef\u4fe1\u606f\u5c06\u662f\u201cInternal server error\u201d\u3002<\/p>\n<p>\u6bd4\u5982\uff0c\u5982\u679c\u6267\u884c\u4ee5\u4e0b\u7684\u5904\u7406<\/p>\n<h5>\u5904\u74061<\/h5>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nn\">sangria.schema.<\/span><span class=\"o\">*<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">sangria.execution.<\/span><span class=\"o\">*<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">sangria.macros.graphql<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">sangria.marshalling.circe.<\/span><span class=\"o\">*<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nn\">scala.concurrent.ExecutionContext<\/span>\r\n\r\n<span class=\"o\">...<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">QueryType<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">ObjectType<\/span><span class=\"o\">(<\/span><span class=\"s\">\"Query\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">fields<\/span><span class=\"o\">[<\/span><span class=\"kt\">Unit<\/span>, <span class=\"kt\">Unit<\/span><span class=\"o\">](<\/span>\r\n  <span class=\"nc\">Field<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"s\">\"sample\"<\/span><span class=\"o\">,<\/span> \r\n    <span class=\"nc\">StringType<\/span><span class=\"o\">,<\/span> \r\n    <span class=\"n\">arguments<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">Argument<\/span><span class=\"o\">(<\/span><span class=\"s\">\"input\"<\/span><span class=\"o\">,<\/span> <span class=\"nc\">StringType<\/span><span class=\"o\">)<\/span> <span class=\"o\">::<\/span> <span class=\"nc\">Nil<\/span><span class=\"o\">,<\/span>\r\n    <span class=\"n\">resolve<\/span> <span class=\"k\">=<\/span> <span class=\"n\">c<\/span> <span class=\"k\">=&gt;<\/span>\r\n      <span class=\"k\">val<\/span> <span class=\"nv\">input<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">c<\/span><span class=\"o\">.<\/span><span class=\"py\">args<\/span><span class=\"o\">.<\/span><span class=\"py\">arg<\/span><span class=\"o\">[<\/span><span class=\"kt\">String<\/span><span class=\"o\">](<\/span><span class=\"s\">\"input\"<\/span><span class=\"o\">)<\/span>\r\n\r\n      <span class=\"k\">if<\/span> <span class=\"nv\">input<\/span><span class=\"o\">.<\/span><span class=\"py\">isBlank<\/span> <span class=\"n\">then<\/span>\r\n        <span class=\"k\">throw<\/span> <span class=\"nc\">Exception<\/span><span class=\"o\">(<\/span><span class=\"s\">\"input is blank\"<\/span><span class=\"o\">)<\/span>\r\n      <span class=\"k\">else<\/span>\r\n        <span class=\"n\">s<\/span><span class=\"s\">\"ok-${input}\"<\/span>\r\n  <span class=\"o\">)<\/span>\r\n<span class=\"o\">))<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">schema<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">Schema<\/span><span class=\"o\">(<\/span><span class=\"nc\">QueryType<\/span><span class=\"o\">)<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">q<\/span> <span class=\"k\">=<\/span> <span class=\"n\">graphql<\/span><span class=\"s\">\"\"\"{ sample(input: \"\") }\"\"\"<\/span>\r\n\r\n<span class=\"n\">given<\/span> <span class=\"nc\">ExecutionContext<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">ExecutionContext<\/span><span class=\"o\">.<\/span><span class=\"py\">global<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">r1<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">Executor<\/span><span class=\"o\">.<\/span><span class=\"py\">execute<\/span><span class=\"o\">(<\/span><span class=\"n\">schema<\/span><span class=\"o\">,<\/span> <span class=\"n\">q<\/span><span class=\"o\">)<\/span>\r\n<span class=\"c1\">\/\/ r1 \u306f Future(&lt;not completed&gt;)<\/span>\r\n<span class=\"nv\">r1<\/span><span class=\"o\">.<\/span><span class=\"py\">foreach<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"r1 result = ${r}\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\uff0c\u6267\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002\u8bf7\u7279\u522b\u7559\u610f\u5c06\u5176\u89c6\u4e3a\u6210\u529f\u7684\u672a\u6765\u60c5\u51b5\u3002<\/p>\n<h5>\u6267\u884c\u7ed3\u679c1<\/h5>\n<pre class=\"post-pre\"><code><span class=\"err\">r<\/span><span class=\"mi\">1<\/span> <span class=\"err\">result<\/span> <span class=\"err\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nl\">\"data\"<\/span> <span class=\"p\">:<\/span> <span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nl\">\"errors\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"nl\">\"message\"<\/span> <span class=\"p\">:<\/span> <span class=\"s2\">\"Internal server error\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"nl\">\"path\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"s2\">\"sample\"<\/span>\r\n      <span class=\"p\">],<\/span>\r\n      <span class=\"nl\">\"locations\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"p\">{<\/span>\r\n          <span class=\"nl\">\"line\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"nl\">\"column\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u4f7f\u7528ExceptionHandler\u6765\u5904\u7406\u8fd9\u79cd\u5f02\u5e38\uff0c\u5e76\u4e14\u53ef\u4ee5\u4f7f\u7528HandledException\u6765\u6784\u5efaGraphQL\u683c\u5f0f\u7684\u9519\u8bef\u5185\u5bb9\u3002<\/p>\n<h5>\u5904\u74062 &#8211; ExceptionHandler\u7684\u5e94\u7528\u793a\u4f8b<\/h5>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ ExceptionHandler \u306e\u5b9f\u88c5<\/span>\r\n<span class=\"k\">val<\/span> <span class=\"nv\">exceptionHandler<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">ExceptionHandler<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"nf\">case<\/span> <span class=\"o\">(<\/span><span class=\"k\">_<\/span><span class=\"o\">,<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"*** Error Handling: ${e}\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"c1\">\/\/ \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u5909\u66f4<\/span>\r\n    <span class=\"nc\">HandledException<\/span><span class=\"o\">(<\/span><span class=\"nv\">e<\/span><span class=\"o\">.<\/span><span class=\"py\">getMessage<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">r2<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">Executor<\/span><span class=\"o\">.<\/span><span class=\"py\">execute<\/span><span class=\"o\">(<\/span><span class=\"n\">schema<\/span><span class=\"o\">,<\/span> <span class=\"n\">q<\/span><span class=\"o\">,<\/span> <span class=\"n\">exceptionHandler<\/span> <span class=\"k\">=<\/span> <span class=\"n\">exceptionHandler<\/span><span class=\"o\">)<\/span>\r\n<span class=\"nv\">r2<\/span><span class=\"o\">.<\/span><span class=\"py\">foreach<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"r2 result = ${r}\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<p>\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u7ed3\u679c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<h5>\u6267\u884c\u7ed3\u679c2<\/h5>\n<pre class=\"post-pre\"><code><span class=\"err\">***<\/span> <span class=\"err\">Error<\/span> <span class=\"err\">Handling:<\/span> <span class=\"err\">java.lang.Exception:<\/span> <span class=\"err\">input<\/span> <span class=\"err\">is<\/span> <span class=\"err\">blank<\/span>\r\n<span class=\"err\">r<\/span><span class=\"mi\">2<\/span> <span class=\"err\">result<\/span> <span class=\"err\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nl\">\"data\"<\/span> <span class=\"p\">:<\/span> <span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nl\">\"errors\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"nl\">\"message\"<\/span> <span class=\"p\">:<\/span> <span class=\"s2\">\"input is blank\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"nl\">\"path\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"s2\">\"sample\"<\/span>\r\n      <span class=\"p\">],<\/span>\r\n      <span class=\"nl\">\"locations\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"p\">{<\/span>\r\n          <span class=\"nl\">\"line\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"nl\">\"column\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5982\u679c\u5728GraphQL\u67e5\u8be2\u4e2d\u51fa\u73b0\u95ee\u9898\u7684\u8bdd<\/h1>\n<p>\u63a5\u7740\uff0c\u5982\u679cGraphQL\u67e5\u8be2\u672c\u8eab\u5b58\u5728\u95ee\u9898\uff0c\u5219\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u65e0\u6cd5\u5904\u7406\uff0c\u5c06\u4ee5Future(Failure(sangria.execution.ValidationError: Query does not pass validation. Violations: \u30fb\u30fb\u30fb \u7684\u5f62\u5f0f\uff0cFuture\u672c\u8eab\u88ab\u89c6\u4e3a\u5931\u8d25\u5904\u7406\u3002<\/p>\n<h5>\u5982\u679cGraphQL\u67e5\u8be2\u5b58\u5728\u95ee\u9898<\/h5>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ \u554f\u984c\u306e\u3042\u308b\u30af\u30a8\u30ea\uff08input \u5f15\u6570\u304c\u672a\u6307\u5b9a\uff09<\/span>\r\n<span class=\"k\">val<\/span> <span class=\"nv\">q2<\/span> <span class=\"k\">=<\/span> <span class=\"n\">graphql<\/span><span class=\"s\">\"{ sample }\"<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">r3<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">Executor<\/span><span class=\"o\">.<\/span><span class=\"py\">execute<\/span><span class=\"o\">(<\/span><span class=\"n\">schema<\/span><span class=\"o\">,<\/span> <span class=\"n\">q2<\/span><span class=\"o\">,<\/span> <span class=\"n\">exceptionHandler<\/span> <span class=\"k\">=<\/span> <span class=\"n\">exceptionHandler<\/span><span class=\"o\">)<\/span>\r\n<span class=\"c1\">\/\/ r3 \u304c Future(Failure(sangria.execution.ValidationError)) \u3068\u306a\u308a foreach \u306e\u51e6\u7406\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044<\/span>\r\n<span class=\"nv\">r3<\/span><span class=\"o\">.<\/span><span class=\"py\">foreach<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"r3 result1 = ${r}\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u4f3c\u4e4e\u53ea\u80fd\u5728Future\u7684recover\u4e2d\u5904\u7406\u9519\u8bef\u3002<\/p>\n<p>\u4f3c\u4e4e\u9664\u4e86ValidationError\u4e4b\u5916\uff0c\u8fd8\u6709\u51e0\u79cd\u9519\u8bef\u53ef\u7528\u3002\u7136\u800c\uff0c\u65e0\u8bba\u662f\u54ea\u79cd\u9519\u8bef\uff0c\u57fa\u672c\u4e0a\u90fd\u5b9e\u73b0\u4e86ErrorWithResolver trait\uff0c\u5e76\u4e14\u901a\u8fc7\u4f7f\u7528resolveError\u65b9\u6cd5\uff0c\u53ef\u4ee5\u83b7\u5f97GraphQL\u683c\u5f0f\u7684\u9519\u8bef\u7ed3\u679c{ &#8230;, &#8220;errors&#8221;: [&#8230;] }\u3002<\/p>\n<h5>\u5904\u74063 &#8211; \u67e5\u8be2\u9519\u8bef\u5904\u7406\u793a\u4f8b<\/h5>\n<pre class=\"post-pre\"><code><span class=\"o\">...<\/span>\r\n\r\n<span class=\"nv\">r3<\/span><span class=\"o\">.<\/span><span class=\"py\">recover<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"k\">case<\/span> <span class=\"n\">e<\/span><span class=\"k\">:<\/span> <span class=\"kt\">ErrorWithResolver<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nv\">e<\/span><span class=\"o\">.<\/span><span class=\"py\">resolveError<\/span>\r\n<span class=\"o\">}.<\/span><span class=\"py\">foreach<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"r3 result2 = ${r}\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<h5>\u6267\u884c\u7ed3\u679c3<\/h5>\n<pre class=\"post-pre\"><code><span class=\"err\">r<\/span><span class=\"mi\">3<\/span> <span class=\"err\">result<\/span><span class=\"mi\">2<\/span> <span class=\"err\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nl\">\"data\"<\/span> <span class=\"p\">:<\/span> <span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nl\">\"errors\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"nl\">\"message\"<\/span> <span class=\"p\">:<\/span> <span class=\"s2\">\"Field 'sample' argument 'input' of type 'String!' is required but not provided. (line 1, column 3):<\/span><span class=\"se\">\\n<\/span><span class=\"s2\">{ sample }<\/span><span class=\"se\">\\n<\/span><span class=\"s2\">  ^\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"nl\">\"locations\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"p\">{<\/span>\r\n          <span class=\"nl\">\"line\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"nl\">\"column\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6equeryValidator\u6765\u8df3\u8fc7\u5bf9\u67e5\u8be2\u7684\u9a8c\u8bc1\uff0c\u4f46\u662f\u4f3c\u4e4e\u65e0\u6cd5\u5728ExceptionHandler\u4e2d\u5904\u7406\uff0c\u57fa\u672c\u4e0a\u6700\u597d\u4e0d\u8981\u4f7f\u7528\u3002<\/p>\n<h5>\u4e0d\u5904\u7406\u7b2c\u56db\u6b65- \u8df3\u8fc7\u67e5\u8be2\u7684\u9a8c\u8bc1<\/h5>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">r4<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">Executor<\/span><span class=\"o\">.<\/span><span class=\"py\">execute<\/span><span class=\"o\">(<\/span><span class=\"n\">schema<\/span><span class=\"o\">,<\/span> <span class=\"n\">q2<\/span><span class=\"o\">,<\/span> <span class=\"n\">queryValidator<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">QueryValidator<\/span><span class=\"o\">.<\/span><span class=\"py\">empty<\/span><span class=\"o\">)<\/span>\r\n<span class=\"c1\">\/\/ r4 \u306f Future(&lt;not completed&gt;)<\/span>\r\n<span class=\"nv\">r4<\/span><span class=\"o\">.<\/span><span class=\"py\">foreach<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nf\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span><span class=\"s\">\"r4 result = ${r}\"<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<h5>\u8fd0\u884c\u7ed3\u679c\u4e3a4\u3002<\/h5>\n<pre class=\"post-pre\"><code><span class=\"err\">r<\/span><span class=\"mi\">4<\/span> <span class=\"err\">result<\/span> <span class=\"err\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nl\">\"data\"<\/span> <span class=\"p\">:<\/span> <span class=\"kc\">null<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nl\">\"errors\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"nl\">\"message\"<\/span> <span class=\"p\">:<\/span> <span class=\"s2\">\"Null value was provided for the NotNull Type 'String!' at path 'input'. (line 1, column 3):<\/span><span class=\"se\">\\n<\/span><span class=\"s2\">{ sample }<\/span><span class=\"se\">\\n<\/span><span class=\"s2\">  ^\"<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"nl\">\"path\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"s2\">\"sample\"<\/span>\r\n      <span class=\"p\">],<\/span>\r\n      <span class=\"nl\">\"locations\"<\/span> <span class=\"p\">:<\/span> <span class=\"p\">[<\/span>\r\n        <span class=\"p\">{<\/span>\r\n          <span class=\"nl\">\"line\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n          <span class=\"nl\">\"column\"<\/span> <span class=\"p\">:<\/span> <span class=\"mi\">3<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"p\">]<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u6b21\u7684\u793a\u4f8b\u4ee3\u7801\u53ef\u4ee5\u5728 https:\/\/github.com\/fits\/try_samples\/tree\/master\/blog\/20230107\/sangria_error_handling \u4e0a\u627e\u5230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5173\u4e8e Scala \u7528\u7684 GraphQL \u5e93 Sangria \u7684\u4ee5\u4e0b\u9519\u8bef\u5904\u7406\u3002 (a) resolve \u51e6\u7406\u3067\u4f8b [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47747","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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