Скачать или смотреть Save a List of Data to Firestore in Flutter

Learn how to save a `List` of data to Firestore in your Flutter app with step-by-step guidance using the `CartItem` model.
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This video is based on the question https://stackoverflow.com/q/64487383/ asked by the user 'Kalindu Aragorn' ( https://stackoverflow.com/u/4422001/ ) and on the answer https://stackoverflow.com/a/64488163/ provided by the user 'Ravi Singh Lodhi' ( https://stackoverflow.com/u/9511650/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Save a List of Data to Firestore in Flutter: A Complete Guide

Are you developing a Shopping Cart Application in Flutter and looking to save users' cart data to Firestore? If you're feeling lost on how to store a list of cart items as documents within a specific order collection, you're in the right place!

In this post, we'll take a closer look at how to store a list of cart items in Firestore by turning each item into a document within an order ID collection. This step-by-step guide will clear any confusion around this topic and guide you in implementing the solution.

Understanding the CartItem Model

First, let's start with our CartItem model. It represents an individual item in our shopping cart. Here's a simple implementation:

[[See Video to Reveal this Text or Code Snippet]]

Attributes:

name: The name of the item.

singlePrice: The price of a single unit of that item.

quantity: The total number of that item in our cart.

Converting CartItem to Map

Firestore requires data in the form of a Map object. Therefore, we need to implement a method called toJson() within our CartItem model to convert the object into a Map. Here's how it's done:

[[See Video to Reveal this Text or Code Snippet]]

Implementing fromJson Method

In addition to converting the object to JSON for uploading, you should also implement a fromJson factory that converts data from Firestore back into a CartItem object:

[[See Video to Reveal this Text or Code Snippet]]

Uploading Cart Data to Firestore

Now that we have our CartItem model with the conversion methods, we can proceed to save our cart items to Firestore. Here’s a function to upload the list of cart items:

[[See Video to Reveal this Text or Code Snippet]]

Key Steps

Iterate over each CartItem in the cartList.

Convert each item to a Map using the toJson() method.

Store each item as a document in the 'OrderID' collection.

Retrieving the Cart List from Firestore

If you want to retrieve the cart list back from Firestore, you can do so with the following method:

[[See Video to Reveal this Text or Code Snippet]]

How It Works

We fetch all documents from the 'OrderID' collection.

Map each document’s data back to a CartItem object.

Return the list of CartItem objects.

Conclusion

Saving a list of data such as cart items to Firestore in your Flutter application is a structured process. By converting your objects into Map format, using the given methods, and implementing upload and retrieval functions effectively, you can ensure the integrity and accessibility of your shopping cart data.

Feel free to reach out if you have any questions or need further clarification on any steps mentioned above. Happy coding!