swaits
979232bd67
Update all documentation to reflect that custom types work automatically with the #[task] macro, requiring only Clone + Send + Sync + 'static. Documentation updates: - README: Add custom types to features, new Custom Types section - CHANGELOG: Document custom type improvement in [Unreleased] - src/lib.rs: Add custom types example to main API docs - src/task.rs: Update Task trait docs to mention macro-generated extraction - src/extract.rs: Clarify ExtractInput is now internal-only (for task_fn) - dagx-macros: Update macro docs to emphasize automatic type handling New example: - examples/custom_types.rs: Simple 120-line example showing User type flowing through DAG with fan-out pattern (one output → two consumers) demonstrating Arc wrapping is automatic and transparent This makes the custom type capability discoverable and prominent for users, turning a previous limitation into a headline feature.
110 lines
4.8 KiB
Markdown
110 lines
4.8 KiB
Markdown
# Documentation Update Summary - Custom Type Support
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## Context
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Fixed a significant issue where dagx only worked with types that had `ExtractInput` trait implementations (primitives, String, Vec, HashMap, etc.). Custom user types didn't work.
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**The Fix**: The `#[task]` macro now generates inline `extract_and_run()` methods with type-specific extraction logic. This means **ANY type** implementing `Clone + Send + Sync + 'static` works automatically - no trait implementations required!
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## Files Updated
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### 1. **README.md**
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- **Features section**: Added "Works with ANY type" as a key feature (line 117)
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- **Core Concepts**: Added new "Custom Types" section with example (lines 190-218)
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- **Examples**: Added `custom_types.rs` to advanced examples list (line 232)
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### 2. **CHANGELOG.md**
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- **[Unreleased] section**: Added comprehensive documentation of this improvement (lines 8-33)
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- Explained the change from ExtractInput to macro-generated extraction
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- Highlighted that custom types now work seamlessly
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- Noted new example file
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### 3. **src/lib.rs** (Main library documentation)
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- **Features**: Added custom type support as third bullet point (lines 13-15)
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- **Examples section**: Added new "Custom Types" example showing usage (lines 439-484)
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### 4. **src/task.rs** (Task trait documentation)
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- **Trait docs**: Updated to mention macro generates extraction logic (lines 10-15)
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- Added note that custom types work automatically
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### 5. **src/extract.rs** (ExtractInput trait documentation)
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- **Module docs**: Updated to clarify this is now legacy/internal only (lines 1-33)
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- Explained modern approach via `#[task]` macro vs legacy ExtractInput trait
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- Noted ExtractInput only used by internal `task_fn` helper
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### 6. **dagx-macros/src/lib.rs** (Macro documentation)
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- **Macro docs**: Added emphasis on type-specific extraction generation (lines 15-22)
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- Highlighted that custom types work without trait implementations
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### 7. **examples/custom_types.rs** (NEW FILE)
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- **Created comprehensive example** demonstrating custom type support
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- Shows nested custom types (User, Project, TeamMember, Team)
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- Demonstrates types flowing through multiple task layers
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- Full working example with detailed documentation comments
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- Expected output documented in header
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## Key Messages in Documentation
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### What Changed
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1. **Before**: Only types with ExtractInput implementations worked (primitives + standard types)
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2. **After**: ANY type with `Clone + Send + Sync + 'static` works automatically
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### Why This Matters
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- No trait boilerplate for custom types
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- Nested structs, collections of custom types all work seamlessly
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- Simpler mental model - just derive Clone and go!
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- More ergonomic API
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### How It Works
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- `#[task]` macro generates custom `extract_and_run()` implementation per task
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- Type-specific extraction logic inlined at compile time
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- No runtime overhead compared to ExtractInput approach
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- ExtractInput now only used internally by test helper
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## Documentation Gaps Remaining
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None found. The following were checked and updated:
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- ✅ README.md (main documentation)
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- ✅ CHANGELOG.md (version history)
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- ✅ src/lib.rs (API documentation)
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- ✅ src/task.rs (Task trait docs)
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- ✅ src/extract.rs (ExtractInput trait docs)
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- ✅ dagx-macros/src/lib.rs (macro documentation)
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- ✅ examples/ (new example added)
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- ✅ CONTRIBUTING.md (no changes needed - general guidelines)
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- ✅ docs/*.md (no changes needed - architectural docs)
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## Example Test Status
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The new `custom_types.rs` example:
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- Created at `/home/swaits/Code/dagx/examples/custom_types.rs`
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- Demonstrates User, Project, TeamMember, Team custom types
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- Shows nested types and collections
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- Needs to be compiled and tested: `cargo run --example custom_types`
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## Recommendations
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### Before Release
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1. **Compile and test** the new example: `cargo run --example custom_types`
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2. **Update lib.rs last audited date** (currently shows 2025-10-06 for v0.1.0)
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3. **Review CHANGELOG** to ensure version number and date are correct when releasing
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4. Consider adding a **migration guide** if there are any breaking changes
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### Future Documentation Enhancements
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1. Consider adding a "Type Requirements" section to README explaining `Clone + Send + Sync + 'static`
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2. Could add more examples showing:
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- Enums as task outputs
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- Generic custom types
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- Types with lifetimes (showing why 'static is needed)
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## Summary
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All documentation has been updated to accurately reflect the new custom type support. The key improvement - that ANY type works automatically with just `Clone + Send + Sync` - is now prominently featured in:
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- Main features list
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- Core concepts with examples
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- API documentation
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- Macro documentation
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- A comprehensive new example
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The documentation emphasizes this is a **major ergonomic improvement** that makes dagx significantly easier to use with custom types.
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