Скачать или смотреть Flutter Dio: Upload FormData and Bulk Images using a Structured Class/Model in REST APIs

Learn how to efficiently upload `FormData` and bulk images in your Flutter application using the Dio package for REST APIs. This guide provides clear code examples and explanations.
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Flutter Dio: Upload FormData and Bulk Images using a Structured Class/Model in REST APIs

As a Flutter developer, you may encounter challenges when trying to upload FormData and bulk images using the Dio package for REST APIs. While working on your Flutter application without changing its existing structure can be a daunting task, there are effective solutions that simplify the process and ensure successful uploads. In this guide, we will discuss how to tackle this problem and guide you through the implementation steps.

Understanding the Problem

The challenge we faced was uploading FormData (which includes multiple files and additional parameters) to a REST API. While the basic setup using Dio and a structured class was functioning well for sending simple JSON data, switching to FormData uploads encountered obstacles that required addressing.

Current Setup

Here’s a brief overview of the code snippets from the original problem:

api_service.dart file containing the API endpoints, including login, signup, and form data receiving methods.

api_url.dart configuring the API URL and initializing the ApiService.

logging_interceptor.dart for managing request and response logging and handling errors.

In this setup, we initially attempted to send the form data using standard maps, which unfortunately did not work for file uploads.

The Solution: Updating the Code

To rectify this issue, we only needed to make a few adjustments in our code. Follow along with the changes required to successfully utilize FormData in your Flutter app.

Step 1: Update the API Service Method

We need to update the formdata_receiving method in the api_service.dart file. Replace the existing method with the following code:

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

This change enables the method to accept FormData as its input, allowing us to send multipart data successfully.

Step 2: Create the FormData Object

Now let's look at how to properly prepare the FormData object in your function call. Instead of a standard map, we will utilize Dio’s FormData helper:

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

Step 3: Calling the API

Finally, initiate the API call with the formData you just created:

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

This approach ensures that your form data is packaged correctly for upload and that all necessary fields, including files, are included.

Conclusion

After implementing these straightforward changes, the FormData upload functionality should work seamlessly in your Flutter application. By updating the API service method and properly creating the FormData object, you can efficiently manage bulk image uploads alongside other form parameters.

This guide should assist you in overcoming the hurdles faced during API integrations using Flutter and Dio. Happy coding and enjoy smooth uploads in your apps!