I am try to track the number of downloads per click on a website.
server.js
router.post("/download", async (req, res) => {
let id = req.body.id;
id = parseInt(id);
let doc = await db.findOneAndUpdate({_id: id}, {downloads: 100});
});
Note: This works
But I'm trying to increase the number by 1 each time.
For example: Let's say the current number of downloads is 5, how do I do it that if there's a post request. The number of downloads increases by 1.
const { body: { id } } = req;
const intCasetedId = parseInt(id);
const retrievedDocument = await db.findOneAndUpdate({ id }, { $inc: { downloads: 1 } });
A couple things are happening here.
First I get the id value from the the req argument using a destructuring assignment.
I use only const to ensure I do not mutate variable values.
I also use the object property value shorthand notation to skip '_id' key in the search query argument. Quoting mongoose documentation:
Issues a mongodb findAndModify update command by a document's _id field. findByIdAndUpdate(id, ...) is equivalent to findOneAndUpdate({ _id: id }, ...).
Then I am using '$inc' operator to increment the downloads field by 1.
I would also highly recommend for you to research eslint
Related
Hi I tried to update the element at a particular index in an array but I'm not able to update it. It is updating the entire array. Not able to figure out how to update any particular index. Also tried
{$set:{"Data.1:req.body}}
this is updating at 1st index but I don't want to hardcode the index value. It should take from frontend. Let say I have a schema in which I have Data who's type is array and default value is as shown below or anything in the same format.
Data: {
type: Array,
Default: ["0","1","0"]
}
Whenever I'll create a user then Data field will contain these default values, But now I want to update the value at any index (coming from frontend) of Data array of any user created.
I tried findByIdAndUpdate method but I don't know what to pass in set property. If I'm passing this {$set: req.body} and In postman I'm giving any value of Data then obviously it is updating Data array but I want to update value at any index which I'm passing from frontend, let say the index I'm passing is 2 then it should update the value of array at index 2, similarly I can pass any index from frontend how should I do that. What changes I have to make in {$set : } Thanks in advance.
Waiting for any help or suggestions. Thanks
It appears that you can solve this in backend logic if you are passing the index from the frontend.
You can dynamically specify the index, based on the input from the frontend, before you send a query.
const updateUserData = async (req, res) => {
const { index, user_id, new_value } = req.body;
try {
const update = {};
update[`Data.${index}`] = new_value;
const data = await Users.updateOne(
{ _id: user_id },
{ $set: update }
);
return res.status(200).json({ success: true });
} catch (error) {
return res.status(500).json({ success: false });
}
};
I know similar questions like this have been asked 1000 times but for the life of me I am struggling with something I feel is quite simple.
We have 2 tables, one called order_lines the other called order_lines_meta, I need to first query order_lines and for each line get the order_lines_meta and return that
I have tried a lot of variations, here is where I am at and stuck, I need it to wait for the order_lines_meta to come back because otherwise I get blank metaData as the data comes after nodejs has already outputted the order_lines
At the end an object that contains order info, line items of objects and within line items a meta data object
Appreciate the help, I just can't seem to wrap my brain on this one , and I am certainly open to other ways of doing this as well
Using nodejs, express, typescript, firestore
const orderNumber = req.query.orderNumber as string;
const customerName = req.query.customerName as string;
const orderDate = req.query.orderDate as string;
const pickListObj = {
orderNumber: orderNumber,
customerName: customerName,
orderDate: orderDate,
line_items: <any>[],
};
db.collection('order_lines').where('number', '==', orderNumber).get().then((snap) => {
const promises = <any>[];
snap.forEach(async (order: any) => {
// get meta data
const metaDataObj = <any>[];
const productName = order.data().name;
const productQty = order.data().quantity;
promises.push(db.collection('worder_line_meta').where('lineId', '==', order.data().lineId).get().then((doc: any) => {
if (doc.display_value != '') {
const meta = [{display_key: doc.data().display_key, display_value: doc.data().display_value}];
metaDataObj.push(meta);
}
}));
});
return Promise.all(promises);
}).then(() => {
pickListObj.line_items.push({name: productName, quantity: productQty, meta_data: metaDataObj});
});
Move the push statement from the last .then inside the previous .then:
promises.push(db.collection('worder_line_meta')...then((doc: any) => {
if (doc.display_value != '') {
...
}
pickListObj.line_items.push({name: productName,
quantity: productQty,
meta_data: metaDataObj});
}));
In the last .then, you will then find the complete pickListObj.
However, I wonder whether it might be simpler and faster to join the two database collections right on the database and retrieve everything with one db.collection operation.
I just can't figure out the query and even if it's allowed to write a single query to push 4 different objects into 4 different arrays deeply nested inside the user Object.
I receive PATCH request from front-end which's body looks like this:
{
bodyweight: 80,
waist: 60,
biceps: 20,
benchpress: 50,
timestamp: 1645996168125
}
I want to create 4 Objects and push them into user's data in Mongo Atlas
{date:1645996168125, value:80} into user.stats.bodyweight <-array
{date:1645996168125, value:60} into user.stats.waist <-array
...etc
I am trying to figure out second argument for:
let user = await User.findOneAndUpdate({id:req.params.id}, ???)
But i am happy to update it with any other mongoose method if possible.
PS: I am not using _id given by mongoDB on purpose
You'll want to use the $push operator. It accepts paths as the field names, so you can specify a path to each of the arrays.
I assume the fields included in your request are fixed (the same four property names / arrays for every request)
let user = await User.findOneAndUpdate(
{ id: req.params.id },
{
$push: {
"stats.bodyweight": {
date: 1645996168125,
value: 80,
},
"stats.waist": {
date: 1645996168125,
value: 60,
},
// ...
},
}
);
If the fields are dynamic, use an object and if conditions, like this:
const update = {};
if ("bodyweight" in req.body) {
update["stats.bodyweight"] = {
date: 1645996168125,
value: 80,
};
}
// ...
let user = await User.findOneAndUpdate(
{ id: req.params.id },
{
$push: update,
}
);
The if condition is just to demonstrate the principle, you'll probably want to use stricter type checking / validation.
try this:
await User.findOneAndUpdate(
{id:req.params.id},
{$addToSet:
{"stats.bodyweight":{date:1645996168125, value:80} }
}
)
I tried to find a way to copy/clone instances in Sequelize but without success. Is there any way to do it with a built-in function or without? What I want is to simply copy rows in the database and the new item should have only a different id.
There is no such direct function for that , What you can do is :
Fetch the object that you want to clone/copy
Remove Primary Key from it
Make a new entry from it
model.findOne({ //<---------- 1
where : { id : 1 } ,
raw : true })
.then(data => {
delete data.id; //<---------- 2
model.create(data); //<---------- 3
})
As said, there is no such direct function for that (thanks Vivek)
If you find useful, place the following code on your model class:
async clone() {
let cData = await THISISMYMODEL.findOne({
where: { id: this.id},
raw: true,
});
delete cData.id;
return await THISISMYMODEL.create(data);
}
Take into account that "THISISMYMODEL" should be the model class defined and "id" the primary key attribute used.
Also take into account the use of Foreign Keys (relations with other models), it will use the same keys. Otherwise you should clone those instances too.
You may need to update the name though or some other field to identify it as a copy,
const data = await model.findOne({ where: {id: 1}, raw: true, attributes: { exclude: ['id'] } });
data.name = data.name + '(copy)';
const newRecord = await model.create(data);
Write a Model.create(data) function inside Model.js and call this function from inside of a loop, as many times you need it will create the copy of the same data.
I'm building an API using node express and mongodb, with mongoose.
I have a post resource that handles user posts, and would like to be able to perform various queries on the post resource.
For instance I have a functions as that returns all posts as follows:
// Gets a list of Posts
exports.index = function(req, res) {
console.log(req.query);
Post.findAsync()
.then(mUtil.responseWithResult(res))
.catch(mUtil.handleError(res));
};
I looking for a good way of processing any additional query params that might come with the request.
/posts will return all posts, but /posts?user=12 will return posts by user with id 12 and /posts?likes=12 will return posts with 12 or more likes.
How can I check for and apply the these query params to filter and return the results since they may or may not be present.
Thanks ;)
If user=12 means "users with id 12", how does likes=12 mean "likes greater than 12"? You need to be more descriptive with your queries. You can do that by passing an array of objects. Send your query in a way that can be interpreted like this:
var filters = [
{
param: "likes",
type: "greater"
value: 12
},
{
param: "user",
type: "equal",
value: "12"
}]
var query = Post.find();
filters.forEach(function(filter) {
if (filter.type === "equal") {
query.where(filter.param).equals(filter.value);
}
else if (filter.type === "greater") {
query.where(filter.param).gt(filter.value);
}
// etc,,,
})
query.exec(callback);