# Introduction
Removing:
- `from` property from actions definition, as it's a legitimate source
of truth. The stored comparison might have been compromised since action
generation. If from is needed it should be computed from the optimistic
cache at runner lvl
- Removed the `FlatEntityPropertyUpdates` Array complexity in favor of
From
```ts
export type PropertyUpdate<T, P extends keyof T> = {
property: P;
} & FromTo<T[P]>;
```
To
```ts
export type FlatEntityUpdate<T extends AllMetadataName> = Partial<
Pick<
MetadataFlatEntity<T>,
Extract<FlatEntityPropertiesToCompare<T>, keyof MetadataFlatEntity<T>>
>
>;
```
## New interactions
From
```ts
const positionUpdate = findFlatEntityPropertyUpdate({
flatEntityUpdates,
property: 'position',
});
if (
isDefined(positionUpdate) &&
(!Number.isInteger(positionUpdate.to) || positionUpdate.to < 0)
) {
const toFlatNavigationMenuItem = {
...fromFlatNavigationMenuItem,
...fromFlatEntityPropertiesUpdatesToPartialFlatEntity({
updates: flatEntityUpdates,
}),
};
```
To
```ts
const positionUpdate = flatEntityUpdate.position;
if (
isDefined(positionUpdate) &&
(!Number.isInteger(positionUpdate) || positionUpdate < 0)
) {
const toFlatNavigationMenuItem = {
...fromFlatNavigationMenuItem,
...flatEntityUpdate,
};
```
## `SanitizeFlatEntityUpdate`
Enforcing the `flatEntityUpdate` to only contains comparable properties
per flat entity by striping out all unexpected keys
In the future we will also move the whole validation at runner lvl at
some point
```ts
export const sanitizeFlatEntityUpdate = <T extends AllMetadataName>({
flatEntityUpdate,
metadataName,
}: {
flatEntityUpdate: FlatEntityUpdate<T>;
metadataName: T;
}): FlatEntityUpdate<T> => {
const { propertiesToCompare } =
ALL_FLAT_ENTITY_PROPERTIES_TO_COMPARE_AND_STRINGIFY[metadataName];
const initialAccumulator: FlatEntityUpdate<T> = {};
return propertiesToCompare.reduce((accumulator, property) => {
const updatedValue =
flatEntityUpdate[property as MetadataFlatEntityComparableProperties<T>];
if (updatedValue === undefined) {
return accumulator;
}
return {
...accumulator,
[property]: updatedValue,
};
}, initialAccumulator);
};
```
