fix poetry add --optional locking

[radoering]

Pull Request Check List

Resolves: #10041

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Fix optional dependency locking when adding a new optional dependency.

Bug Fixes:

• Fix a bug where adding an optional dependency with poetry add --optional would not correctly update the lock file.

Tests:

• Add tests to verify the fix for optional dependency locking.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request fixes an issue where optional dependencies were not being correctly added to the lock file when using the poetry add --optional command. The changes ensure that when a dependency is added with the --optional flag, it is correctly included in the extras section of the lock file and that the lock file is updated with the new dependency.

Sequence diagram for adding optional dependency

sequenceDiagram
    participant User as User
    participant Add as AddCommand
    participant Poetry as PoetryPackage
    participant Lock as Locker

    User->>Add: poetry add --optional dependency
    Add->>Add: handle()
    Note over Add: Process dependency constraints
    Add->>Add: _add_dependency_to_extras()
    Add->>Poetry: Get package extras
    Poetry-->>Add: Current extras
    Add->>Poetry: Update package extras
    Add->>Lock: Refresh lock file
    Lock-->>Add: Lock file updated
    Add-->>User: Dependency added successfully

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Class diagram for AddCommand changes

classDiagram
    class AddCommand {
        +handle()
        -_add_dependency_to_extras(dependency: Dependency, extra_name: NormalizedName)
        -notify_about_existing_packages(existing_packages: list[str])
    }
    class Dependency {
        +name: str
        +_in_extras: list[str]
    }
    class Poetry {
        +package: Package
    }
    class Package {
        +extras: dict
    }
    AddCommand --> Dependency: uses
    AddCommand --> Poetry: uses
    Poetry --> Package: contains

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Flow diagram for optional dependency handling

flowchart TD
    A[Start] --> B[Process dependency]
    B --> C{Is optional?}
    C -->|Yes| D[Canonicalize extra name]
    D --> E[Set _in_extras]
    E --> F[Add to extras]
    F --> G[Update lock file]
    C -->|No| G
    G --> H[End]

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File-Level Changes

Change	Details	Files
Correctly add optional dependencies to the lock file.	Added logic to set the _in_extras attribute on the dependency object when the --optional flag is used. Added a new method _add_dependency_to_extras to handle adding the dependency to the extras section of the package. Modified the handle method to call the new _add_dependency_to_extras method when adding an optional dependency.	src/poetry/console/commands/add.py
Add tests to verify the fix.	Added new test cases to verify that optional dependencies are correctly added to the lock file. Added assertions to check the content of the lock file, specifically the extras section and the markers of the added package. Modified existing test cases to use a different dependency to avoid conflicts with other tests.	tests/console/commands/test_add.py

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[sourcery-ai]

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

Overall Comments:

• Please add documentation updates explaining the fixed behavior of poetry add --optional. This will help users understand how optional dependencies are now handled correctly.

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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