forked from https://github.com/symfony/symfony
31fb219896
This PR was merged into the 5.1-dev branch.
Discussion
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[Form] Added an AbstractChoiceLoader to simplify implementations and handle global optimizations
| Q | A
| ------------- | ---
| Branch? | master
| Bug fix? | no
| New feature? | yes
| Deprecations? | no
| Tickets | ~
| License | MIT
| Doc PR | ~
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Taking over #33218 (taking over #30983)
The `ChoiceLoaderInterface` is not easy to understand/implement, while its goal is simple, lazy load an array of choices.
What may seem complicated is the how/what to optimize loading, we need to deal with a `$value` callback (which refers to the `choice_value` option allowing to transform a model choice to a unique string value that can be displayed/submitted).
We have now enough implementations in core to justify the need of an abstraction and provide a better DX in the process.
Before this PR we needed to implement 3 methods to create a loader:
- `loadChoiceList(?callable $value): ChoiceListInterface`
- `loadChoicesForValues(array $values, ?callable $value): array`
- `loadValuesForChoices(array $choices, ?callable $value): array`
and handle optimization, in each.
Now we only need to implement:
- `loadChoices(): iterable`
and optionnally:
- `doLoadChoicesForValues(array $values, ?callable $value): array`
if more optimization is needed to only load submitted values, (i.e the core intl loader prevents loading values that are the same as choices, and the doctrine one performs a `WHERE id IN ($ids)` query).
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