Data Layer in Flutter | Use the Repository Pattern to keep a local copy of your API data

Опубликовано: 01 Март 2026
на канале: David Serrano

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In this video I'm going to demonstrate how to implement the Repository Pattern to keep a local copy of the data fetched from a remote API.

Contents of the video:
Explanation and application of the Repository Pattern in Flutter
How to make API requests using the dio package
How to interact with an SQLite database using sqflite
How to write models faster using json_serializable

Useful resources:
Open source project created in the video: https://github.com/svprdga/Flutter-Da...
Recipes API used in the demo app: https://rapidapi.com/apidojo/api/tasty/
Clean Architecture: https://blog.cleancoder.com/uncle-bob...
Package to make the API requests (dio): https://pub.dev/packages/dio
Package to interact with the database (sqflite): https://pub.dev/packages/sqflite
Package to auto-generate models (json_serializable): https://pub.dev/packages/json_seriali...
Flutter pagination example: • Flutter Tutorial: Giphy Clone - Speed Code...
Command to execute json_serializable to auto-generate the models:
flutter pub run build_runner build

🔤 Text version of the video:
https://davidserrano.io/data-layer-in...

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⏳ Timecodes:
00:00 - Introduction
00:36 - Final sample app demonstration
01:12 - Summary and scope
02:05 - What is the Repository Pattern?
03:52 - Create the app and add the required dependencies
06:03 - Create the domain model (Recipe)
06:50 - Create the network model (RecipeEntity)
12:05 - Create the API client
16:40 - Create the mapper to convert models
18:14 - Create the repository
19:20 - Create the App widget
22:47 - Create the main screen
27:10 - First app execution only fetching the data from the remote API
27:43 - Detail screen to show the recipe description
30:20 - Create the database model (RecipeDbEntity)
33:05 - Create the Data Access Object (DAO)
37:55 - Refactor the repository to be able to use both data sources
40:45 - Final app adjustments
41:32 - Second app execution to check the final behavior
44:13 - Final words