在猫鼬的每个查找查询中添加（注入）条件

Question

I want to add(inject) a condition to all of my find-like queries, by find-like queries I mean queries that have find in them, like find , findOne , findOneAndUpdate , findByIdAndUpdate and ...

for example, I have this query in my code:

model.findOne({a: 1})

but I want this query to run:

model.findOne({a: 1, b: 2})

and my purpose is that {b:2} be in every query so I don't want to be typing it in every single query.

I tried to use schema.pre('find', function(){}) hook but I failed.

I used the hook like this:

schema.pre('find', async function f(){
    const query = Object.assign({}, { b: 2}, this.getQuery())
    this.setOptions(query)
    console.log(this.getQuery())
})

but the console.log shows that the query has not changed.

Answer 1

findOne example:

AuthorSchema.pre('findOne', function(next) {
  // Put your logic here for whatever you want to "decorate" ...
  let conditions = this.getQuery() // get the current conditions
  conditions._id = "5b80f96e9fceda195ba853af" // Change to whatever you want
  this._conditions = conditions  // Set the new conditions
  next();
});

Would make this:

var result = Author.findOne({_id: "5b7fa665844b5ebfad064b1c" })
.populate("books")
.exec()

Return actually the record with ObjectId of 5b80f96e9fceda195ba853af