在JOI架构验证的when条件下，如何访问数组外部的键

Question

我有一个问题。

"Formula": {
    "Type": "Import/Export",
    "Params": {
        "ShippingSourceType": "System/Country/Group",
        ShippingDestinationType:"System/Country/Group"
    }
}

我有上面的对象，我必须在其中对类型进行验证。但Type在参数上依赖于ShippingSourceType和ShippingDestinationType。

如果ShippingSourceType是系统，则Type应该是Export。如果ShippingDestinationType为系统，则类型应为Import。

我已验证类型如下：

Type: joi.alternatives().required()
    .when('Params.ShippingSourceType', { is: 'System', then: joi.string().valid('Export') })
    .when('Params.ShippingDestinationType', { is: 'System', then: joi.string().valid('Import') })

但它没有起作用。你能建议一下如何解决这个问题吗？

Answer 1

原来这是Joi 的一个错误

推送了一个提交来修复它，但将在版本8中提供。

同时，您可以通过从特定提交安装Joi来使用它，如下所示：

npm install --save git+https://github.com/hapijs/joi.git#5b60525b861a3ab99123cd8349cbd9f6ed50e262

然后，您可以使用：

var joi = require('joi');
var schema = joi.object({
  Formula: joi.object().keys({
    Type: joi.string() // Use joi.string()
      .when('Params.ShippingSourceType', { is: 'System', then: joi.string().valid('Export')})
      .when('Params.ShippingDestinationType', { is: 'System', then: joi.string().valid('Import')}),
    Params: joi.object(), // or additional validation
  }),
});

现在一切如预期：

joi.validate({
  Formula: {
    Type: "Export",
    Params: {
      ShippingSourceType: "System",
      ShippingDestinationType:"Country"
    }
  }
}, schema, function (err, value) {
  // If I understood correctly, this should be valid
  console.log(err ? 'object invalid' : 'object valid');
});
joi.validate({
  Formula: {
    Type: "Import",
    Params: {
      ShippingSourceType: "System",
      ShippingDestinationType:"Country"
    }
  }
}, schema, function (err, value) {
  // If I understood correctly, this should be invalid since
  // ShippingSourceType == "System" => Type == "Export"
  console.log(err ? 'object invalid' : 'object valid');
});
joi.validate({
  Formula: {
    Type: "Import",
    Params: {
      ShippingSourceType: "Country",
      ShippingDestinationType:"System"
    }
  }
}, schema, function (err, value) {
  // If I understood correctly, this should be valid
  console.log(err ? 'object invalid' : 'object valid');
});
joi.validate({
  Formula: {
    Type: "Export",
    Params: {
      ShippingSourceType: "Country",
      ShippingDestinationType:"System"
    }
  }
}, schema, function (err, value) {
  // If I understood correctly, this should be invalid since
  // ShippingDestinationType == "System" => Type == "Export"
  console.log(err ? 'object invalid' : 'object valid');
});
joi.validate({
  Formula: {
    Type: "Export",
    Params: {
      ShippingSourceType: "Country",
      ShippingDestinationType:"Country"
    }
  }
}, schema, function (err, value) {
  // Should be valid
  console.log(err ? 'object invalid' : 'object valid');
});