deleting route for an array in mongodB using node.js - node.js

Question

var userSchema=new mongoose.Schema({
username:String,
password:String,
email:String,
tasks:[{
task: String
}]
});
This is my database schema.I want to create a delete route for the task to be removed.Can anyone tell me how to do so. Right now I am able to fetch the task id.
Here is link to my c9 project https://ide.c9.io/akspan12/newprojectworkspace

Answer 1

var express = require('express');
var router = express();
//I will take static values you can give dynamic values by using req.body
router.post('/Delete_User_Task',function(req,res){
var UserSchema = require('/path/to/Schema.js');//your schema model path
var username = 'akshansh123'; //assume it is present in db
//If you want to remove all task of this user and set one task as empty string your query and changes will be like below
var query = {
'username' :username
};
var changes = {
$set:{
'tasks':[{
task:''
}]
}
};
//If you completely want to remove json array tasks from user document than your query and changes will be like below
var query = {
'username' :username
};
var changes = {
$unset:{
'tasks':''
}
};
//If you want to remove particular task suppose say sleeping from user document than your query and changes will be like below
var query = {
'username' :username
};
var changes = {
$pull:{
'tasks':{
'task':'sleeping'
}
}
};
//If you want to remove selected tasks suppose say sleeping,walking,drinking from user document than your query and changes will be like below
var query = {
'username' :username
};
var changes = {
$pull:{
'tasks':{
'task':{
$in:['sleeping','walking','drinking']
}
}
}
};
UserSchema.update(query,changes,function(err,Result){
if(!err){
res.send('Successfully Removed tasks');
}else{
res.send('something went wrong');
console.log(err);
}
})
})
Hope this may solve your issue!!!

Answer 2

app.patch("/todo/:id",function(req,res){
User
.findById(req.user.id, function(err, foundUser) {
if(err){
req.flash("error",err.message);
console.log(err);
return res.redirect("back");
} if(!foundUser) {
req.flash("error","User not found");
return res.redirect("back");
} else {
foundUser.update({$pull: {tasks: {_id: req.params.id}}}, function(err) {
if(err) {
req.flash("error",err.message);
console.log(err);
return res.redirect("back");
} else {
req.flash("success","Task removed");
return res.redirect("/todo");
}
});
}
});
});
This is the delete route I used.