如何在 Node.js 中使用 mongoose.Schema 添加特定长度的数组？

Question

I'm working on a project and need an array value, when entered, to have an array length of at least 12. I've read through some of the documentation on their site and I haven't found anything yet so I thought it wouldn't hurt to post here while I continue searching.

This is an example of the code.

const schema = new mongoose.Schema({
Array: {
         type: Array,
         required: true,
       }
});

Any insights you have would be greatly appreciated! If there's something I could clarify better please let me know!

Answer 1

You can use validate() from mongoose while defining your schema.

const schema = new mongoose.Schema({
Array: {
         type: Array,
         required: true,
         validate : lengthMin12
       }
});


const lengthMin12 = (val) => {
return val.length >= 12;
}

PS: The above link is from the latest version, but validate is available for older mongoose versions too.