在几个集合中的猫鼬findOne（）

Question

I'm building a deletion process where I need to find out if a certain document is referenced from another documents before deleting the original document.

In the example below, I need to find out if a given Company is used somewhere in my other documents:

Model metadata:

Company = {
    id: ID,
    name: name
}

User = {
    id: ID,
    name: name,
    company_id: ID
}

Application = {
     id: ID,
     type: string,
     company_id: ID
}

...

Here is what I would do using asynchronous calls:

const checkInUse = async (company_id) =>  {

     let ret = await UserModel.findOne({ company_id: company_id });

     if (ret) return true;

     ret = await ApplicationModel.findOne({ company_id: company_id });

     if (ret) return true;

     ...

     return false;
}

I have some dozen of collections, so some checks would take several calls to findOne() , and that's what I want to avoid.

Is there is a better way of doing this check ?

Answer 1

Yes, use only find() instead of findOne() and the filters you want to specify, it will return a Mongoose list of documents.

Source: http://mongoosejs.com/docs/queries.html