#Flutter firebase architecture how to
#Flutter firebase architecture pdf
#Flutter firebase architecture code
#Flutter firebase architecture free

a remote cart repository, used by authenticated users (backed by a remote database).a local cart repository, used by guest users (backed by local storage).an auth repository, used to sign in and sign out.What this means in practice is that we need three repositories to make things work: If user is signed in, then add item to remote cart else add item to local cart With this setup, we can add an item to the correct cart with this logic: a remote shopping cart used by signed-in users.One way to do it is to have two shopping carts: So how can we replicate the same functionality in our example app? This way, you can freely search the product catalog as a guest and only sign in or register when you proceed to checkout. Adding items as a guest or logged-in userĮCommerce sites such as Amazon or eBay will let you add items to the shopping cart before creating an account. To make things even more interesting, let's add one more requirement. In other words, the shopping cart items (and the logic for updating them) need to be shared across multiple widgets. Multiple widgets, shared logic?Īs we can already see, there are multiple widgets (each page is a widget itself) that need access to the shopping cart data to show the correct UI. This page lets us edit the quantity or remove items from the cart.

We also need a shopping cart page: Shopping cart page with options to edit quantity and remove items On the top right corner, we also find a shopping cart icon with a badge telling us how many items are in the cart. This page lets us select the desired quantity (1) and add the product to the cart (2). Let's consider some example UI we may use to implement a shopping cart feature.Īt a very minimum, we need a product page: Product page with quantity selector and 'Add to Cart' button.

#Flutter firebase architecture pdf

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#Flutter firebase architecture free

We'll also learn to easily manage multiple dependencies with Riverpod (using Ref inside a service class).Ĭode with Andrea is free for everyone. We'll start with a conceptual overview of this feature, to see how everything fits together at a high level.Īnd then, we'll dive into some implementation details and implement a CartService class that depends on multiple repositories.

#Flutter firebase architecture how to

Arrows show the dependencies between layersĪnd in this article, we're going to focus on the application layer and learn how to implement a shopping cart feature for an eCommerce app in Flutter. This architecture defines four separate layers with clear boundaries: Flutter App Architecture using data, domain, application, and presentation layers.

Flutter App Architecture: The Presentation Layer.

Flutter App Architecture: The Domain Model.

Flutter App Architecture: The Repository Pattern.

Flutter Project Structure: Feature-first or Layer-first?.

Flutter App Architecture with Riverpod: An Introduction.

In fact, separation of concerns is the #1 reason why we need a good app architecture.Īnd in previous articles, I've introduced a reference app architecture that has worked very well for my projects:

#Flutter firebase architecture code

In this case, it's tempting to put that logic inside the classes that we already have (widgets or repositories).īut this leads to poor separation of concerns, making our code harder to read, maintain, and test. needs to be used (shared) by more than one widget.depends on multiple data sources or repositories.When building complex apps, we may find ourselves writing logic that: