Sails JS:使用嵌入式JSON属性验证模型

时间:2014-09-07 13:36:27

标签: javascript sails.js

如何在Sails JS中使用类型为object的属性验证模型?

我知道具有简单值(例如字符串)的属性是可以接受的,但是这对嵌套JSON有何用处?

如下所示:

{
    name: 'John',
    location: {
        x: 23,
        y: 15,
        z: 50
    }
}

它的形式如下:

{
    name: {
        type: 'string',
        required: true,
    },
    location: {
        x: {
            type: 'number',
            required: true
        },
        y: {
            type: 'number',
            required: true
        },
        z: {
            type: 'number',
            required: true
        }
    }
}

3 个答案:

答案 0 :(得分:5)

Waterline(Sails ORM)不直接支持嵌套模式。您可以使用custom validation rule来验证属性:

module.exports = {

  types: {
    location: function(val) {
      // Make sure that x, y and z are present and are numbers.
      // This won't allow numeric strings, but you can adjust to fit your needs.
      return (_.isNumber(val.x) && _.isNumber(val.y) && _.isNumber(val.z));
    }
  },

  attributes: {

    location: {
      type: 'json',
      required: true, // If you want the whole attribute to be required
      location: true  // Validate that the attribute has the schema you want
    }

    ...more attributes...

  }

};

答案 1 :(得分:0)

到目前为止,我发现的最优雅的解决方案是使用“计算机”库(由sailsjs人构建的,它在sailsjs中为操作提供动力)来定义类型验证“计算机”。

首先,您需要一个类型定义助手:

$ cat api/types/define.js 
const buildWithCustomUsage = require("machine").buildWithCustomUsage;

function validateWith(machine, inputs) {
    machine(inputs).now();
    return true;
}

module.exports = function (def) {
    const machine = buildWithCustomUsage({
        def,
        extraArginsTactic: "doNotCheck"
    });
    return {
        machine,
        validate: validateWith.bind(null, machine)
    };
};

然后您可以定义如下类型:

$ cat api/types/QuoteRequest.js 
module.exports = require("./define")({

    description: "Quote request type definition",

    inputs: {
        input_currency_type: {
            description: "Input currency type",
            type: "string",
            required: true
        },
        amount_requested: {
            description: "Requested amount in input currency",
            type: "string",
            required: true
        }
    },

    sync: true,

    fn: function (inputs, exits) {
        // your other validation logics
        return exits.success();
    }
});

您需要确保设置sync: true

要在控制器中使用它,请执行以下操作:

inputs: {
    request: {
        type: "json",
        required: true,
        custom: require("../../types/QuoteRequest").validate
    }
},

希望有帮助!

答案 2 :(得分:0)

我已经建立了结构比较功能来处理此类情况,我想与您分享,希望对您有所启发和帮助:

假设您使用的是Sails v1

./api/services中使用以下代码创建名为ModelService.js的文件:

module.exports = {
  invalidStructure(schema, input) {
    try {
      if (schema.type === 'array') {
        // Invalid: if input is not array
        //  OR some of input[items] doesn't match schema.item
        return !_.isArray(input) ||
          _.some(input, item => this.invalidStructure(schema.item, item));
      }
      else if (schema.type === 'object') {
        // Invalid if input is not an object
        //  OR if input.keys doesn't match schema.struct.keys
        //  OR if typeof input[key] doesn't match schema.struct[key]
        return !_.isObjectLike(input) ||
          !_.isEqual(_.keys(schema.struct), _.keys(input)) ||
          _.some(_.keys(input), key => this.invalidStructure(schema.struct[key], input[key]));
      }
      else { // verifying field value vs schema.type
        // TODO: Add other field validations here (i.e. isEmail, required,...etc.)
        return typeof input !== schema.type;
      }
    }
    catch (err) {
      sails.log.error('Exception in [invalidStructure] : ', err);
      return true;
    }
  }
}

并在模型中像这样使用它:

const address = {
  type: 'object',
  struct: {
    name: { type: 'string' },
    location: {
      type: 'object',
      struct: {
        x: { type: 'string' },
        y: { type: 'string' },
        z: { type: 'string' },
      }
    }
  }
}
module.exports = {
  attributes: {
    address: {
      type: 'json',
      custom: value => !ModelService.invalidStructure(address, value)
    }
  }
}

现在我知道这不能解决问题或案件(即required: false

但是它应该让您开始使用匹配的json 结构值类型

注意:这是source file。随时使用,或通过PR增强功能