Скачать или смотреть How to Properly Return Nested Objects in TypeORM with QueryBuilder

Learn how to modify your TypeORM query to return nested objects instead of raw data using QueryBuilder for better data organization in your application.
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Understanding the Challenge of Returning Nested Objects in TypeORM

When working with TypeORM, especially in applications that leverage QueryBuilder, developers often encounter issues where the structure of the returned data isn’t quite what they expect. For instance, you might want to return nested objects that represent relationships between entities, but the results might come back in a flattened, raw format instead. This post will explore a common scenario involving TypeORM and demonstrate how to adjust your query to achieve the desired nested object structure.

The Problem

Let's say you have a query that attempts to join user projects and their associated details, but instead of the structured, nested result you were hoping for, you're getting a raw data format.

Here’s the initial code snippet causing the problem:

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

The result you receive looks like this:

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

However, what you really wanted was a nested structure like this:

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

The Solution

To achieve the desired nested object structure, you need to replace the getRawOne() method with getOne() in your query. The getOne() method is specifically designed to return results as entities rather than raw data, allowing TypeORM to construct the proper nested object hierarchy for you.

Here’s how you can revise your code:

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

Key Points to Remember

Use getOne() for Nested Structures: The getOne() function retrieves results as complete entities, which allows TypeORM to return nested data structures.

Understanding Relationships: Make sure your relationships between entities are properly defined in your TypeORM models. This ensures they can be utilized effectively in your query.

Debugging Results: Always log and inspect your results to check whether they align with the expected format after changing your query method.

Conclusion

Using TypeORM's QueryBuilder effectively requires understanding how different query methods affect the structure of the returned data. In this case, switching from getRawOne() to getOne() allows you to return nested objects, making your data far more manageable and consistent with how you might typically want to structure your application's response.

If you're trying to craft organized data for easier handling in your application, following this approach will save you significant headaches down the road. If you have further questions or need additional help with your TypeORM queries, feel free to ask!