Update errors.md

[sabrahul]

Added partial error response details in error guides

Description

This PR enhances the Dealing with Errors documentation by adding details about partial error responses. It addresses an issue where a single resolver failure causes the entire GraphQL response to be null instead of returning partial data. The update explains the expected behavior and highlights the importance of using Optional types in field resolvers to ensure partial responses are correctly handled.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

• Closes Resolver error nulls other resolvers #3814

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Document how Strawberry handles partial responses when a resolver fails, and explain how to use Optional types to ensure partial responses are correctly handled.

Enhancements:

• Explain how Strawberry handles partial responses when a resolver fails.
• Recommend the use of Optional types in field resolvers to ensure partial responses are correctly handled.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request enhances the 'Dealing with Errors' documentation by adding a section about partial error responses. It explains how GraphQL handles resolver failures by returning partial data when fields are defined as optional, and provides an example to illustrate this behavior.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added a section explaining partial responses for failed resolvers, detailing how GraphQL returns both successful data and error details when a resolver fails, provided the field is optional.	Introduced the 'Partial responses for failed resolvers' section. Explained that GraphQL allows partial responses when a resolver fails, returning successfully resolved fields alongside errors. Emphasized that this behavior applies only when the erroneous field is defined as optional. Provided a Python example with successful_field and error_field to demonstrate partial responses. Included a GraphQL query to fetch both fields. Showed the JSON response with data for successfulField, null for errorField, and error details. Highlighted GraphQL's ability to return partial results.	docs/guides/errors.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#3814	Document the behavior of strawberry-graphql regarding partial responses when a resolver throws an error.	✅
#3814	Explain how to ensure partial responses are returned when some resolvers fail in a query.	✅

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[sourcery-ai]

Hey @sabrahul - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a note about how to configure Strawberry to always return partial responses, even for non-optional fields.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[patrick91]

This is perfect! Thank you!

[patrick91]

@sabrahul can you add "failed" here? https://github.com/strawberry-graphql/strawberry/blob/main/.alexrc#L16

[sabrahul]

Hi @patrick91, I have added what you've asked. Is there something else we need to do?

[patrick91]

@sabrahul no, all good! thanks!

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