docs : add custom fields simplification design spec

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-04-04 12:32:11 +02:00
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# Custom Fields Simplification — Design Spec
**Date:** 2026-04-04
**Scope:** Backend minor cleanup + Frontend unification of the custom fields system
**Constraint:** Everything must work after — progressive migration with verification at each step
## Problem
The custom fields system has grown into 3 parallel frontend implementations (~2900 lines across 9 files) due to accumulated defensive code. This caused data bugs (orphaned fields, lost linkage) and makes every change risky.
## 4 Custom Field Contexts
1. **Machine** — fields defined directly on the machine (`CustomField.machineid` FK), values on machine
2. **Standalone entity** — fields defined in ModelType (category), values on composant/piece/product. Visible when opening the entity directly
3. **Machine context** — fields with `machineContextOnly=true` defined in ModelType, values stored on `MachineComponentLink`/`MachinePieceLink`. Visible only from the machine detail page
4. **Category editor** — UI for defining/editing custom fields in a ModelType skeleton
## Backend Changes
### Minor — format already consistent
After review, `MachineStructureController` already serializes custom fields in the same format as API Platform:
```json
// CustomFieldValue (from normalizeCustomFieldValues)
{
"id": "cfv-123",
"value": "USOCOME",
"customField": {
"id": "cf-456",
"name": "MARQUE",
"type": "text",
"required": false,
"options": [],
"defaultValue": null,
"orderIndex": 0,
"machineContextOnly": false
}
}
```
```json
// CustomField definition (from normalizeCustomFieldDefinitions)
{
"id": "cf-456",
"name": "MARQUE",
"type": "text",
"required": false,
"options": [],
"defaultValue": null,
"orderIndex": 0,
"machineContextOnly": false
}
```
The only backend task is adding `defaultValue` to the API Platform serialization groups on `CustomField.php` so that both API Platform and the custom controller return it.
**Context fields on links** are returned as two separate arrays:
- `contextCustomFields` — definitions filtered to `machineContextOnly=true`
- `contextCustomFieldValues` — values stored on `MachineComponentLink`/`MachinePieceLink`
This format stays as-is. The frontend unified module handles the merge.
**Files:**
- `src/Entity/CustomField.php` — add `#[Groups(['composant:read', 'piece:read', 'product:read', 'machine:read'])]` to `defaultValue`
### Legacy `{key, value}` format in DB
`SkeletonStructureService::normalizeCustomFieldData()` accepts two formats:
- Legacy: `{key: "name", value: {type, required, options?, defaultValue?}}`
- Standard: `{name, type, required, options?, defaultValue?}`
**Pre-migration check required:** verify if any `ModelType` rows still have the legacy format in their structure data. If yes, write a one-time DB migration to normalize them before removing the frontend parsing code in Step 5. If no legacy data exists, the parsing code can be safely removed.
## Frontend Changes
### New Unified Module (2 files, ~400 lines total)
**`shared/utils/customFields.ts`** (~180 lines) — Pure logic, zero Vue dependency
Types:
- `CustomFieldDefinition``{ id, name, type, required, options, defaultValue, orderIndex, machineContextOnly }`
- `CustomFieldValue``{ id, value, customField: CustomFieldDefinition }`
- `CustomFieldInput``{ ...CustomFieldDefinition, value, customFieldId, customFieldValueId }` (the merged type used by forms)
Functions:
- `mergeDefinitionsWithValues(definitions, values)``CustomFieldInput[]` — the ONE merge function replacing the 3 current ones. Matches by `customField.id` then by `name`. When no value exists for a definition, uses `defaultValue` as initial value.
- `filterByContext(fields, context: 'standalone' | 'machine')` — filters on `machineContextOnly`
- `sortByOrder(fields)` — sorts by `orderIndex`
- `formatValueForSave(field)` / `shouldPersist(field)` — persistence helpers
- `formatValueForDisplay(field)` — display helper (e.g. boolean → `Oui/Non`), replaces `formatCustomFieldValue` from `customFieldUtils.ts`
- `fieldKey(field, index)` — stable key for v-for, replaces `fieldKey` from `customFieldFormUtils.ts`
**`composables/useCustomFieldInputs.ts`** (~220 lines) — Reactive, wraps pure helpers
```ts
function useCustomFieldInputs(options: {
definitions: MaybeRef<CustomFieldDefinition[]>
values: MaybeRef<CustomFieldValue[]>
entityType: 'machine' | 'composant' | 'piece' | 'product' | 'machineComponentLink' | 'machinePieceLink'
entityId: MaybeRef<string | null>
context?: 'standalone' | 'machine' // defaults to 'standalone'
}): {
fields: ComputedRef<CustomFieldInput[]>
update: (field: CustomFieldInput) => Promise<void>
saveAll: () => Promise<string[]> // returns failed field names
requiredFilled: ComputedRef<boolean>
}
```
**Usage for context 3 (machine context fields on links):**
```ts
// For each MachineComponentLink, instantiate with:
const contextFields = useCustomFieldInputs({
definitions: link.contextCustomFields, // from MachineStructureController
values: link.contextCustomFieldValues, // from MachineStructureController
entityType: 'machineComponentLink',
entityId: link.id,
context: 'machine',
})
```
### Files Deleted After Migration
| File | Lines | Replaced by |
|------|-------|-------------|
| `shared/utils/entityCustomFieldLogic.ts` | 335 | `shared/utils/customFields.ts` |
| `shared/utils/customFieldUtils.ts` | 440 | `shared/utils/customFields.ts` |
| `shared/utils/customFieldFormUtils.ts` | 404 | `shared/utils/customFields.ts` + `composables/useCustomFieldInputs.ts` |
| `composables/useEntityCustomFields.ts` | 181 | `composables/useCustomFieldInputs.ts` |
Additionally refactored (not deleted):
- `composables/useMachineDetailCustomFields.ts` — custom fields code extracted, uses new module (keeps non-CF logic: constructeurs, products, transforms)
- `shared/model/componentStructure.ts` — custom fields code removed (kept: structure/skeleton logic)
- `shared/model/componentStructureSanitize.ts` — custom fields sanitize code removed
- `shared/model/componentStructureHydrate.ts` — custom fields hydrate code removed
### All consuming files to migrate
**Composables:**
- `composables/useComponentEdit.ts` — use `useCustomFieldInputs`
- `composables/useComponentCreate.ts` — use `useCustomFieldInputs`
- `composables/usePieceEdit.ts` — use `useCustomFieldInputs`
- `composables/useMachineDetailCustomFields.ts` — use `useCustomFieldInputs` for all 3 machine sub-cases
**Pages:**
- `pages/component/[id]/index.vue` — already uses composable, minimal changes
- `pages/component/[id]/edit.vue` — already uses composable, minimal changes
- `pages/component/create.vue` — already uses composable, minimal changes
- `pages/pieces/create.vue` — imports from `customFieldFormUtils`, migrate to new types
- `pages/pieces/[id]/edit.vue` — already uses composable, minimal changes
- `pages/product/create.vue` — imports from `customFieldFormUtils`, migrate to new types
- `pages/product/[id]/edit.vue` — imports from `customFieldFormUtils`, migrate to new types
- `pages/product/[id]/index.vue` — imports from `customFieldFormUtils`, migrate to new types
**Shared components:**
- `components/common/CustomFieldDisplay.vue` — imports 7 functions from `entityCustomFieldLogic`, rewrite with unified `CustomFieldInput` type
- `components/common/CustomFieldInputGrid.vue` — imports `fieldKey` + `CustomFieldInput` from `customFieldFormUtils`, update imports
- `components/ComponentItem.vue` — imports from `entityCustomFieldLogic` + `useEntityCustomFields`, migrate
- `components/PieceItem.vue` — imports from `entityCustomFieldLogic` + `useEntityCustomFields`, migrate
- `components/machine/MachineCustomFieldsCard.vue` — imports `formatCustomFieldValue` from `customFieldUtils`, use `formatValueForDisplay`
- `components/machine/MachineInfoCard.vue` — imports `formatCustomFieldValue` from `customFieldUtils`, use `formatValueForDisplay`
- `components/model-types/ModelTypeForm.vue` — use `shared/utils/customFields.ts` types
**Tests:**
- `tests/shared/customFieldFormUtils.test.ts` — rewrite for new module or delete
## Migration Strategy — Progressive (6 steps)
### Step 1: Backend minor fix + DB check
- Add `defaultValue` to serialization groups in `CustomField.php`
- Check DB for legacy `{key, value}` format in `model_types.structure` — write migration if needed
- **Verify:** call `/api/composants/{id}`, confirm `defaultValue` appears in `customField` objects
### Step 2: Create new module
- Write `shared/utils/customFields.ts` and `composables/useCustomFieldInputs.ts`
- Port existing test to new module
- **Verify:** import in a test page, confirm merge/filter/sort/defaultValue work with real data
### Step 3: Migrate standalone pages (composant/piece/product)
- Refactor composables: `useComponentEdit.ts`, `useComponentCreate.ts`, `usePieceEdit.ts`
- Refactor pages: `pieces/create.vue`, `product/create.vue`, `product/[id]/edit.vue`, `product/[id]/index.vue`
- Refactor shared components: `CustomFieldInputGrid.vue`, `CustomFieldDisplay.vue`
- **Verify per page:** open entity, check fields display with values (including defaultValue on new entities), modify a value, confirm save works
### Step 4: Migrate machine page + hierarchy components
- Refactor `useMachineDetailCustomFields.ts` — use `useCustomFieldInputs` for:
- Machine direct fields (definitions from `machine.customFields`, values from `machine.customFieldValues`)
- Standalone component/piece fields (definitions from `type.customFields`, values from entity's `customFieldValues`, filtered `machineContextOnly=false`)
- Machine context fields (definitions from `link.contextCustomFields`, values from `link.contextCustomFieldValues`)
- Refactor `ComponentItem.vue`, `PieceItem.vue` — use `useCustomFieldInputs` instead of `useEntityCustomFields`
- Refactor `MachineCustomFieldsCard.vue`, `MachineInfoCard.vue` — use `formatValueForDisplay`
- **Verify:** open a machine with components that have both normal AND machine-context custom fields, check both display and save correctly
### Step 5: Migrate category editor
- Check DB for legacy `{key, value}` format — run migration if needed
- Clean `componentStructure.ts`, `componentStructureSanitize.ts`, `componentStructureHydrate.ts` — remove custom fields code, use unified types from `customFields.ts`
- Refactor `ModelTypeForm.vue`
- **Verify:** edit a component category, modify skeleton custom fields, save, check linked components see changes
### Step 6: Cleanup
- Delete the 4 old files
- Delete or rewrite `tests/shared/customFieldFormUtils.test.ts`
- `npm run lint:fix` + `npx nuxi typecheck` = 0 errors
- Final smoke test of all 4 contexts
## Result
- **~2900 lines → ~400 lines** + simplified consumers
- **9 custom fields files → 2**
- **3 parallel systems → 1**
- **1 unified data format** understood by all pages
- **`defaultValue` properly handled** across all contexts
- **Legacy format eliminated** from DB and code