Batch Mutations for creating, updating, and deleting #438

[keithhackbarth]

Batch mutations for creating, updating, and deleting.

Description

Batched mutations are mutations that mutate multiple objects at once.
Mutations with a filter function or accept a list of objects that return a list.

Types of Changes

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

Issues Fixed or Closed by This PR

#438

Checklist

• [x ] 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).

Key Considerations When Reviewing

Previously, batch creation in Strawberry Django was an undocumented and untested feature, relying on hidden logic to adjust argument typing. To support batch operations as an official feature (including updates and deletes), I updated the syntax approach, which introduces a breaking change.

The new method explicitly requires batch mutations to take a list type as an argument. This makes the behavior more straightforward, consistent, and explicit.

Summary by Sourcery

Implement batch mutations for creating, updating, and deleting multiple objects simultaneously, requiring list-type arguments for clarity and consistency. Update documentation and add tests to support this new feature.

New Features:

• Introduce batch mutations for creating, updating, and deleting multiple objects at once, allowing operations to accept a list of objects and return a list.

Enhancements:

• Refactor mutation logic to explicitly require batch mutations to take a list type as an argument, improving clarity and consistency.

Documentation:

• Update documentation to include information on using batch mutations for create, update, and delete operations.

Tests:

• Add tests for batch mutations to ensure correct functionality for create, update, and delete operations with lists.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR implements batch mutations for creating, updating, and deleting multiple objects in a single operation. The implementation makes batch operations an official feature by explicitly requiring list types as arguments, replacing the previous undocumented approach that relied on hidden logic for batch creation.

Sequence diagram for batch mutation process

sequenceDiagram
    actor User
    participant System

    User->>System: Send batch mutation request
    System->>System: Check if data is a list
    alt Data is a list
        System->>System: Process each item in the list
    else Data is not a list
        System->>System: Process single item
    end
    System->>User: Return mutation results

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Class diagram for batch mutation changes

classDiagram
    class Mutation {
        +create_fruit: Fruit
        +create_fruits: list[Fruit]
        +patch_fruits: list[Fruit]
        +update_fruits: list[Fruit]
    }
    class FruitInput
    class FruitPartialInput
    class Fruit
    class FruitFilter

    Mutation --> FruitInput
    Mutation --> FruitPartialInput
    Mutation --> Fruit
    Mutation --> FruitFilter

    note for Mutation "Batch mutations now require list types as arguments"

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File-Level Changes

Change	Details	Files
Refactored mutation resolver to handle batch operations	Added new resolver method to handle instance-level updates Modified main resolver to process both single and batch operations Added helper function get_vdata for data extraction Removed implicit list handling for create mutations	strawberry_django/mutations/fields.py
Added documentation for batch mutations	Added new section explaining batch mutation syntax Provided examples for batch create, update, and delete operations	docs/guide/mutations.md
Added comprehensive test coverage for batch operations	Added tests for batch create operations Added tests for batch delete with filters Added tests for batch update with filters Added tests for batch patch operations Added tests for empty list handling	tests/mutations/test_batch_mutations.py tests/mutations/conftest.py tests/mutations/test_filter_mutations.py

Possibly linked issues

• Add batch mutation for update and delete operation #438: The PR implements batch update and delete operations, directly addressing the issue's request.

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[sourcery-ai]

Hey @keithhackbarth - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟡 Testing: 2 issues found
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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[keithhackbarth]

@bellini666, @thclark, @patrick91 - What is the process for requesting a PR review here?

[bellini666]

Hi @keithhackbarth ,

Sorry for taking long to review this. I'm in the middle of a relocation (just moved from Brazil to the Netherlands) and it is consuming all of my time.

I'll try to take some time during this week, or maximum next weekend to review this!

[keithhackbarth]

Thanks, @bellini666 – and congrats on the move! Hope you're settling in well and enjoying the Netherlands.

Quick semi-related question: is there a specific reason we disable all DjangoOptimizerExtension for mutations? Just want to clarify the reasoning behind that approach. When I remove those lines in mutations/fields.py and rerun pytest - everything works and its more performant so trying to figure out the logic.