# What this PR does
Overall naming `universal` versus `flat` is not always the most updated
and so on
Will make a big cleaning tour after I've finished the whole migration
Migrating all `view` and ( filter fields etc ) `field` `object` `index`
to the universal pattern on all `services`, `builder` and `runner`
levels
## Universal and flat optimistic tooling
`addUniversalFlatEntityToUniversalFlatEntityAndRelatedEntityMapsThroughMutationOrThrow`
and its delete counterpart maintain the consistency of
`UniversalFlatEntityMaps` when an entity is created or removed. Beyond
inserting/removing the entity from its own maps, they walk through
`ALL_UNIVERSAL_METADATA_RELATIONS` to update the **aggregator arrays**
on related parent entities — the add appends the new entity's
`universalIdentifier` to the parent's aggregator (e.g. a new viewField's
identifier gets appended to its parent view's
`viewFieldUniversalIdentifiers`), and the delete filters it out. This
keeps the maps in sync so that diff computations and relation lookups
remain accurate throughout the migration building process.
## ALL_UNIVERSAL_METADATA_RELATIONS
`ALL_UNIVERSAL_METADATA_RELATIONS` is the universal counterpart of
`ALL_METADATA_RELATIONS`. It maps each metadata entity to its
many-to-one and one-to-many relations using universal foreign keys
(`*UniversalIdentifier`) instead of database IDs (`*Id`). This allows
migration actions to reference related entities in a workspace-agnostic
way. Relations that are workspace-specific (e.g. `workspace`,
`dataSource`, `userWorkspace`) are set to `null` and skipped during
resolution.
## `workspaceMigrationCreateIdEnrichment`
Reserved to API metadata ( will be able to validate at app installation
lvl )
- Workspace migration `create` actions now carry an optional `id` (and
`fieldIdByUniversalIdentifier` for object/field actions) so that
caller-provided IDs flow through the entire build-validate-run pipeline.
- New `enrichCreateWorkspaceMigrationActionsWithIds` utility resolves
`universalIdentifier → id` mappings after the builder runs and injects
them into the migration actions before the runner persists entities.
- Runner action handlers use the provided IDs instead of generating new
UUIDs, enabling deterministic entity creation for synchronization
workflows.
## `resolveUniversalUpdateRelationIdentifiersToIds`
`resolveUniversalUpdateRelationIdentifiersToIds` converts universal
identifiers (workspace-agnostic, stable keys) in a migration update
payload into concrete database UUIDs, so the update can be applied to a
specific workspace.
It iterates over the many-to-one relations defined in
`ALL_UNIVERSAL_METADATA_RELATIONS` for the given entity type, replaces
each `*UniversalIdentifier` property with its corresponding `*Id` by
looking up the target entity in `allFlatEntityMaps`, and throws if a
non-null identifier can't be resolved.
Used by all `update` action handlers in
`transpileUniversalActionToFlatAction`, avoiding duplicated resolution
logic across handlers.
## What this PR does not
- Migrating twenty-standard declaration to universal
- Migrating all the inputs transpilers to universal
- Migrating all metadata to be fully universal ( we still need to
de-scope the type of all of them and refactor their validator very close
)
---------
Co-authored-by: Charles Bochet <charles@twenty.com>
