如何在[String]类型的集合中为元素设置默认值? [英] how to set a default value to element in a collection of type [String]?

问题描述

点击提交按钮后，我便有了快速表单，此方法便被触发

i have quickform once the submit button clicked, this method is fired

submitPost: function (app) {
    check(app, {
      title: String,
      description: String,
      category: String,
      price: Number
    });
    var knownId = Products.insert(app);
    Products.update({ _id: knownId }, { $set:{screenShots: scs, previewImage: pi, sourceCode: zip }});

  }

当我未在集合中为"screenShots，previewImage和sourceCode"提供默认值时，提交按钮不起作用.

the submit button wasn't working when i didn't give "screenShots, previewImage, and sourceCode" a default values in a collection.

一旦我给他们一个默认值，如下所示

Once i gave them a default value like it is shown below

previewImage: {
    type: String,
    defaultValue: "jjj",
  },
   sourceCode: {
    type: String,
    defaultValue: "jjj",
  },
  screenShots: {
    type: [String],
    autoValue: function() {
      return [];
    }
  },

现在表单中的提交"按钮正在工作，并且触发了更新方法.它会同时更新"previewImage和sourcCode"，但"screenShots"仍然为空.

now the submit button in the form is working and the update method is triggered. it updates both "previewImage and sourcCode" but "screenShots" is still empty.

我不确定，但是我认为问题与autoValue有关，我应该将其设为默认值，但是如何为字符串类型数组的元素提供默认值呢?

am not sure but i believe the problem has to do with autoValue which i should make it a default value, but how do i give an element that of type array of string a default value?

还是问题与其他原因有关?

or the problem has to do with something else?

推荐答案

在模式中使用optional: true，它将通过检查是否为空.

use optional: true in the schema if the value is optional, and it will pass check if it is empty.

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