Add FlowSystemStatus enum and restructure validation architecture by FBumann · Pull Request #598 · flixOpt/flixopt

FBumann · 2026-02-03T21:19:30Z

Description

This PR introduces explicit lifecycle status tracking for FlowSystem and restructures the validation architecture for better separation of concerns.

Key Changes

FlowSystemStatus Enum (flow_system_status.py)
- New FlowSystemStatus IntEnum with 5 lifecycle states: INITIALIZED, CONNECTED, MODEL_CREATED, MODEL_BUILT, SOLVED
- Status-based invalidation via invalidate_to_status() that clears appropriate caches when status drops
- Replaced boolean flags (is_locked, _connected_and_transformed) with derived properties from status
Validation Architecture Split
- validate_config() on Element classes (Flow, Storage, Component, Bus, Effect, etc.) - simple checks that don't require DataArrays (None checks, isinstance, basic constraints)
- validate() on *Data classes (FlowsData, StoragesData, etc.) - batched DataArray validation checks
BatchedAccessor Caching
- All *Data objects (flows, storages, buses, effects, components, converters, transmissions) are now cached in BatchedAccessor
- Cached instances are reused in both _run_validation() and build_model(), avoiding duplicate creation
- Cache is cleared via _reset() during status invalidation
Bug Fix: Validation Order (commit a5157a2)
- Fixed regression where Bus with no flows caused cryptic TypeError instead of clear ValueError
- Reordered validation: buses validated before flows to catch "no flows" error early
- Added guard in FlowsData.validate() for empty flows edge case

Type of Change

Code refactoring
New feature
Bug fix

Testing

I have tested my changes
Existing tests still pass
All 188 core element tests pass
Validation regression tests verify all checks are preserved

Checklist

My code follows the project style
I have updated documentation if needed
I have added tests for new functionality (if applicable)

coderabbitai · 2026-02-03T21:19:38Z

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📝 Walkthrough

Walkthrough

This PR implements a comprehensive validation architecture refactoring by introducing validate_config methods across element and component classes, adding batch-level validation to data containers, and establishing a cached BatchedAccessor for efficient batched data access. The validation flow shifts from per-element checks to a centralized, batched approach integrated within FlowSystem.

Changes

Cohort / File(s)	Summary
Validation API Standardization `flixopt/elements.py`, `flixopt/components.py`, `flixopt/effects.py`	Added `validate_config()` methods to Component, Bus, Flow, Storage, LinearConverter, Transmission, Effect, EffectsModel, and EffectCollection classes. Existing `_plausibility_checks()` now delegate to `validate_config()` for backward compatibility, centralizing configuration-level validation logic.
Batched Data Validation `flixopt/batched.py`	Added `validate()` methods to StoragesData, FlowsData, EffectsData, BusesData, ComponentsData, ConvertersData, and TransmissionsData for batch-level plausibility checks. Introduced BatchedAccessor with cached properties (storages, intercluster_storages, buses, effects, components, converters, transmissions) and a unified `validate()` entry point. Added module-level logger setup.
Validation & Data Access Integration `flixopt/flow_system.py`, `flixopt/structure.py`	Replaced per-element plausibility check loops with batched validation via BatchedAccessor. Consolidated data object creation by using cached `batched.*` properties instead of creating separate data containers, reducing redundant instantiations in model building.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

Feature/simplify structure #464: Complements this PR's validation architecture by refactoring _set_flow_system and transform_data plumbing that coordinates element linking to FlowSystem alongside the new batched validate/BatchedAccessor patterns.

Suggested labels

v3.0.0

Poem

🐰 Hop! Hop! Validation's reformed,
From scattered checks to batches warmed,
AccessData cached and true,
Old _plausibility delegates too!
A cleaner flow, more organized so! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 78.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	⚠️ Warning	The title mentions 'FlowSystemStatus enum' but the raw_summary shows no changes to flow_system_status.py file or enum creation; actual changes focus on validation architecture restructuring.	Update title to accurately reflect the main change: 'Restructure validation architecture with separate validate_config and validate methods' or similar.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description is comprehensive and well-structured, covering all key changes, type of change, testing status, and checklist items.

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✨ Finishing touches

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Commit unit tests in branch feature/element-data-classes+validation

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Classes Updated with validate_config() ┌──────────────────┬───────────────┬────────────────────────────────────────────────────────────────────────────┐ │ Class │ Location │ Config Checks │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Component │ elements.py │ unique flow labels, status→flows.size │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Bus │ elements.py │ no flows connected │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Flow │ elements.py │ status→size, fixed_profile→size, load_factor→size, previous_flow_rate type │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Effect │ effects.py │ period dimension for over_periods constraints │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ EffectCollection │ effects.py │ circular loops, unknown effect refs │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ LinearConverter │ components.py │ conversion_factors XOR piecewise, degrees_of_freedom, flow refs │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Storage │ components.py │ initial_charge_state string, balanced→InvestParams, final_charge→capacity │ ├──────────────────┼───────────────┼────────────────────────────────────────────────────────────────────────────┤ │ Transmission │ components.py │ bus consistency, balanced→InvestParams │ └──────────────────┴───────────────┴────────────────────────────────────────────────────────────────────────────┘ *Data Classes with validate() ┌───────────────────┬────────────┬─────────────────────────────────────────────────────────────────────────┐ │ Class │ Location │ DataArray Checks │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ FlowsData │ batched.py │ relative_min ≤ max, size required for bounds │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ StoragesData │ batched.py │ capacity for relative bounds, initial vs capacity, balanced size compat │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ BusesData │ batched.py │ imbalance_penalty == 0 warning │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ TransmissionsData │ batched.py │ balanced size compatibility │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ EffectsData │ batched.py │ delegates to validate_config() │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ ComponentsData │ batched.py │ delegates to validate_config() │ ├───────────────────┼────────────┼─────────────────────────────────────────────────────────────────────────┤ │ ConvertersData │ batched.py │ delegates to validate_config() │ └───────────────────┴────────────┴─────────────────────────────────────────────────────────────────────────┘ Updated FlowSystem _run_plausibility_checks() now creates temporary *Data instances and calls validate() on each, which handles both config and DataArray checks in a centralized way.

What Changed *1. BatchedAccessor now caches all Data classes: class BatchedAccessor: @Property def flows(self) -> FlowsData: ... @Property def storages(self) -> StoragesData: ... @Property def intercluster_storages(self) -> StoragesData: ... @Property def buses(self) -> BusesData: ... @Property def effects(self) -> EffectsData: ... @Property def components(self) -> ComponentsData: ... @Property def converters(self) -> ConvertersData: ... @Property def transmissions(self) -> TransmissionsData: ... 2. FlowSystemModel.build_model() now uses cached instances: batched = self.flow_system.batched self.effects = EffectsModel(self, batched.effects) # reuses cached self._flows_model = FlowsModel(self, batched.flows) # reuses cached # etc. 3. _run_plausibility_checks() simplified: batched = self.batched batched.flows.validate() batched.buses.validate() # etc. Benefits - No duplicate creation: Same *Data objects used for validation AND model building - Early validation: Errors caught during connect_and_transform() - Proper invalidation: _batched = None when status drops below CONNECTED - Cleaner code: No temporary object creation in validation or build_model

FBumann · 2026-02-03T21:34:42Z

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coderabbitai · 2026-02-03T21:34:49Z

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When a Bus has no flows connected, FlowsData.validate() crashed with a cryptic TypeError instead of raising a clear ValueError message. Root Cause In _run_validation(), the validation order was: 1. batched.flows.validate() ← crashed on empty DataArray operations 2. batched.buses.validate() ← would have caught the error

FBumann · 2026-02-04T11:52:36Z

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coderabbitai · 2026-02-04T11:52:47Z

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…-classes+validation # Conflicts: # flixopt/elements.py

Move validation to FlowsData mostly
97c9787

FBumann added 2 commits February 3, 2026 22:21

FBumann marked this pull request as ready for review February 3, 2026 21:34

FBumann changed the title ~~Move validation to FlowsData mostly~~Add FlowSystemStatus enum and restructure validation architectureFeb 3, 2026

FBumann added 3 commits February 3, 2026 23:16

Temp
48fc561

Improve organization of validation
45c99c4

FBumann added 3 commits February 5, 2026 08:53

Merge branch 'feature/element-data-classes' into feature/element-data…
96f744c
…-classes+validation # Conflicts: # flixopt/elements.py

Add warning for no relative_minimum=0 with status
2c87923

Improve validation by using helpers
53ea155

FBumann merged commit 0b4a395 into feature/element-data-classesFeb 5, 2026
4 of 8 checks passed

coderabbitaiBot mentioned this pull request Feb 6, 2026
Feature/element data classes #602
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Add FlowSystemStatus enum and restructure validation architecture - #598

Add FlowSystemStatus enum and restructure validation architecture#598
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