in the following code, external variables cannot be fetched within $where, for example, req, prompts that req is not defined. Why is the solution?
router.get("/get",(req,res)=>{
comments.find({$where:function(){
return this._id===req.query.id
}},{email:0}).exec((err,docs)=>{
if(err){
res.json({
sts:0,
data:err
})
return
}
res.json({
sts:1,
data:docs
})
})
})I answered my own question. Although I still don't know why $where is written as a function, it can't get the value of a variable outside the function, but it can be changed to a string
.`this._id==='${req.query.id}'`you can get it, and if any great god knows why the function can't get the value, it can't solve the puzzle. Thank you!
Previous: About the upload component of element-ui
Next: How to automatically complete html and css in php file in VS code editor
problem description I want to update a field in the subdocument array, which has been written according to the official document but cannot be updated. Please take a look at it. Thank you! related codes Update method: modle.updateOne({ "...
in the following code, external variables cannot be fetched within $where, for example, req, prompts that req is not defined. Why is the solution? router.get( get ,(req,res)=>{ comments.find({$where:function(){ return this._id===req.que...
in the following code, external variables cannot be fetched within $where, for example, req, prompts that req is not defined. Why is the solution? router.get( get ,(req,res)=>{ comments.find({$where:function(){ return this._id===req.que...
in the following code, external variables cannot be fetched within $where, for example, req, prompts that req is not defined. Why is the solution? router.get( get ,(req,res)=>{ comments.find({$where:function(){ return this._id===req.que...
in the following code, external variables cannot be fetched within $where, for example, req, prompts that req is not defined. Why is the solution? router.get( get ,(req,res)=>{ comments.find({$where:function(){ return this._id===req.que...