mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-09-19 16:06:32 +02:00
99 lines
2.6 KiB
Markdown
99 lines
2.6 KiB
Markdown
---
|
|
title: Adding a custom operation
|
|
summary: Add a new operation for model types
|
|
---
|
|
# Extending the schema
|
|
|
|
[CHILDREN asList]
|
|
|
|
[alert]
|
|
You are viewing docs for a pre-release version of silverstripe/graphql (4.x).
|
|
Help us improve it by joining #graphql on the [Community Slack](https://www.silverstripe.org/blog/community-slack-channel/),
|
|
and report any issues at [github.com/silverstripe/silverstripe-graphql](https://github.com/silverstripe/silverstripe-graphql).
|
|
Docs for the current stable version (3.x) can be found
|
|
[here](https://github.com/silverstripe/silverstripe-graphql/tree/3)
|
|
[/alert]
|
|
|
|
## Adding a custom operation
|
|
|
|
By default, we get basic operations for our models, like `read`, `create`,
|
|
`update`, and `delete`, but we can add to this list by creating
|
|
an implementation of `OperationProvider` and registering it.
|
|
|
|
Let's build a new operation that **duplicates** DataObjects.
|
|
|
|
```php
|
|
class DuplicateCreator implements OperationCreator
|
|
{
|
|
public function createOperation(
|
|
SchemaModelInterface $model,
|
|
string $typeName,
|
|
array $config = []
|
|
): ?ModelOperation
|
|
{
|
|
$mutationName = 'duplicate' . ucfirst(Schema::pluralise($typeName));
|
|
|
|
return ModelMutation::create($model, $mutationName)
|
|
->setType($typeName)
|
|
->addArg('id', 'ID!')
|
|
->setDefaultResolver([static::class, 'resolve'])
|
|
->setResolverContext([
|
|
'dataClass' => $model->getSourceClass(),
|
|
]);
|
|
}
|
|
```
|
|
|
|
We add **resolver context** to the mutation because we need to know
|
|
what class to duplicate, but we need to make sure we still have a
|
|
static function.
|
|
|
|
The signature for resolvers with context is:
|
|
|
|
```php
|
|
public static function (array $context): Closure;
|
|
```
|
|
|
|
We use the context to pass to a function that we'll create dynamically.
|
|
Let's add that now.
|
|
|
|
```php
|
|
public static function resolve(array $resolverContext = []): Closure
|
|
{
|
|
$dataClass = $resolverContext['dataClass'] ?? null;
|
|
return function ($obj, array $args) use ($dataClass) {
|
|
if (!$dataClass) {
|
|
return null;
|
|
}
|
|
return DataObject::get_by_id($dataClass, $args['id'])
|
|
->duplicate();
|
|
};
|
|
}
|
|
```
|
|
|
|
Now, just add the operation to the `DataObjectModel` configuration
|
|
to make it available to all DataObject types.
|
|
|
|
**app/_graphql/config.yml**
|
|
```yaml
|
|
modelConfig:
|
|
DataObject:
|
|
operations:
|
|
duplicate:
|
|
class: 'MyProject\Operations\DuplicateCreator'
|
|
```
|
|
|
|
And use it:
|
|
|
|
**app/_graphql/models.yml**
|
|
```yaml
|
|
MyProject\Models\MyDataObject:
|
|
fields: '*'
|
|
operations:
|
|
read: true
|
|
duplicate: true
|
|
```
|
|
|
|
### Further reading
|
|
|
|
[CHILDREN]
|