How to Solve Type Mismatch Issue in Flutter with List Map String, dynamic and List ProjectBoxes

Overcome Flutter's type mismatch error when assigning `List Map String, dynamic ` to `List ProjectBoxes ` by implementing a conversion function, with step-by-step instructions in this guide.
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How to Solve Type Mismatch Issue in Flutter with List<Map<String, dynamic>> and List<ProjectBoxes>

When working with Flutter, developers often run into type mismatches that can halt their progress. One common issue is trying to assign a List<Map<String, dynamic>> to a List<ProjectBoxes>. This can lead to frustrating error messages that can be tough to decipher. If you've encountered the problem, you're not alone—many developers struggle with this while trying to render lists from database queries into more structured data types.

In this guide, we’ll explore this issue in detail and provide a practical solution to help you move forward.

The Problem: Understanding the Type Mismatch

The error message you're likely to see is:

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

This means that your variable type expectations are not aligned with the data you're trying to assign. Here's a breakdown of the scenario:

Source Type: List<Map<String, dynamic>> - This is essentially a list where each item is a map (dictionary) containing key-value pairs.

Target Type: List<ProjectBoxes> - This is a structured list of ProjectBoxes objects you created to represent your box entities.

To fix this, you can't directly assign one to the other; you must convert the items from the map into ProjectBoxes instances.

The Solution: Building a Converter

Step 1: Loop through the Map List

Instead of a direct assignment, you'll need to loop through each item in _journalBoxes, extract the necessary fields, and construct ProjectBoxes objects from those fields.

Step 2: Implement the Conversion Logic

You will create a loop to convert each map entry to a ProjectBoxes object. Here's how to do it:

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

Example ProjectBoxes Class Structure

In the context of this example, make sure that your ProjectBoxes class is structured appropriately to accept the parameters you are passing:

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

Putting It All Together

With the loop implemented, your _refreshJournals function should look something like this:

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

Conclusion

Type mismatches can be quite the hurdle when developing with Flutter, especially when dealing with database queries and data mapping. By understanding how to convert a list of maps into structured objects, you can avoid these common pitfalls and streamline your Flutter development process.

Now you're equipped with the knowledge to tackle that pesky type mismatch issue like a pro! Happy coding!