Using Meteor package to efficiently import JSON arrays into mongoDB

Question

Using Meteor package to efficiently import JSON arrays into mongoDB

I am currently working on developing a meteor package that will allow users to import JSON files into collections in a mongoDB. However, I'm uncertain about the feasibility of this task.

The idea is for the user to upload a JSON file and specify the collection name in an input field for the import process. Subsequently, the JSON array should be stored in the specified collection.

HTML:

<template name="importJSON">
    <form id="importJson">
        <input type="text" id="collection">
        <input type="file" id="file">
    </form>
</template>

Meteor:

Template.importJSON.events({
    'submit #importJson': function(e){
        e.preventDefault();
        var collection = e.target.collection.value;
        var obj = JSON.parse(response);
        db.collection.insert(obj);
    }
});

However, I am faced with three challenges:

1) How do I handle the actual file upload process, especially since the file needs to be uploaded temporarily?

2) Is there a way to dynamically use the inputted collection name?

3) How can I ensure that the imported data is inserted correctly? Using insert might simply append the new data to existing data, correct?

javascript json mongodb meteor

Answer 1

Answer №1

To address the three questions you mentioned:

1) What is the best way to handle temporary file uploads?

If your goal is simply to read the file and insert it into a collection, you can achieve this without actually uploading the file. You can read the file on the client-side. Here is a helpful article on Reading files in JavaScript using the File APIs.

2) How do I use the input-field provided collection name?

Let's assume the collection name provided in the input field is products. If you have sample data structured like this:

{
  "name": "Product",
  "id": "Product identifier",
  "name": "Name of the product",
  "price": "9990",
  "tags": ["tag1", "tag2"]
}

You would first need to have a corresponding collection on the server side.

<your app name>/lib/collections/products.js

Products = new Meteor.Collection('Products');

In your client-side code:

var rawproducts = (content of the file you read using the File API)
var newproducts = JSON.parse(rawproducts);

for (var i = 0; i < newproducts.length; i++) {
  Products.insert(newproducts[i]);
}

You can also test this locally by creating a local-only collection.

//pass null as collection name, it will create
//local only collection
Products = new Mongo.Collection(null);

for (var i = 0; i < newproducts.length; i++) {
 Products.insert(newproducts[i]);
}

Note: Using a local-only collection means the data remains on the client side.

3) How should I import data correctly without just appending it?

The method described above for importing data will keep appending the new data. Consider implementing a mechanism to de-dupe or completely replace existing data if necessary.

Hope this clarifies things.

Update:

How can I remove all elements from a collection?

Products.remove({}) // removes every product

Answer 2

To address the three questions you mentioned:

1) What is the best way to handle temporary file uploads?

If your goal is simply to read the file and insert it into a collection, you can achieve this without actually uploading the file. You can read the file on the client-side. Here is a helpful article on Reading files in JavaScript using the File APIs.

2) How do I use the input-field provided collection name?

Let's assume the collection name provided in the input field is products. If you have sample data structured like this:

{
  "name": "Product",
  "id": "Product identifier",
  "name": "Name of the product",
  "price": "9990",
  "tags": ["tag1", "tag2"]
}

You would first need to have a corresponding collection on the server side.

<your app name>/lib/collections/products.js

Products = new Meteor.Collection('Products');

In your client-side code:

var rawproducts = (content of the file you read using the File API)
var newproducts = JSON.parse(rawproducts);

for (var i = 0; i < newproducts.length; i++) {
  Products.insert(newproducts[i]);
}

You can also test this locally by creating a local-only collection.

//pass null as collection name, it will create
//local only collection
Products = new Mongo.Collection(null);

for (var i = 0; i < newproducts.length; i++) {
 Products.insert(newproducts[i]);
}

Note: Using a local-only collection means the data remains on the client side.

3) How should I import data correctly without just appending it?

The method described above for importing data will keep appending the new data. Consider implementing a mechanism to de-dupe or completely replace existing data if necessary.

Hope this clarifies things.

Update:

How can I remove all elements from a collection?

Products.remove({}) // removes every product

Using Meteor package to efficiently import JSON arrays into mongoDB

Answer №1

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