如何检查 mongoose / mongo db 中特定文档数组中的元素是否存在？

Question

look, I have this schema:

_id: 'id'
info: {
   array: ['a', 'b', 'c']
}

I want to check something like this:

doc = schema.find({ _id: 'id' });
if ( doc.info.array.includes('a') ) //returning true

I don't know how to make that. Can someone help me?

Answer 1

there are many ways to check this but here are a few:

 var data = schema.find({ _id: "id", array: { $in: ["a"] }, }); if (;data) { return false; } return true

Another way is by:

 var data = schema.find({ _id: "id", array: { $in: ["a"] }, }).count(); if (data == 0) { return false; } return true