# DSL: AshOban

Tools for working with AshOban triggers.


## oban


### Nested DSLs
 * [triggers](#oban-triggers)
   * trigger


### Examples
```
oban do
  api AshOban.Test.Api

  triggers do
    trigger :process do
      action :process
      where expr(processed != true)
      worker_read_action(:read)
    end
  end
end

```




### Options
| Name | Type | Default | Docs |
| ---  | ---  | ---     | ---  |
| `api`* | `module` |  | The Api module to use when calling actions on this resource |


## oban.triggers


### Nested DSLs
 * [trigger](#oban-triggers-trigger)


### Examples
```
triggers do
  trigger :process do
    action :process
    where expr(processed != true)
    worker_read_action(:read)
  end
end

```




## oban.triggers.trigger
```elixir
trigger name
```






### Examples
```
trigger :process do
  action :process
  where expr(processed != true)
  worker_read_action(:read)
end

```



### Arguments
| Name | Type | Default | Docs |
| ---  | ---  | ---     | ---  |
| `name` | `atom` |  | A unique identifier for this trigger. |
### Options
| Name | Type | Default | Docs |
| ---  | ---  | ---     | ---  |
| `action`* | `atom` |  | The action to be triggered. Defaults to the identifier of the resource plus the name of the trigger |
| `scheduler_queue` | `atom` |  | The queue to place the scheduler job in. The same queue as job is used by default (but with a priority of 1 so schedulers run first). |
| `scheduler_cron` | `String.t \| false` | "* * * * *" | A crontab configuration for when the job should run. Defaults to once per minute ("* * * * *"). Use `false` to disable the scheduler entirely. |
| `stream_batch_size` | `pos_integer` |  | The batch size to pass when streaming records from using `c:Ash.Api.stream!/2`. No batch size is passed if none is provided here, so the default is used. |
| `queue` | `atom` |  | The queue to place the worker job in. The trigger name is used by default. |
| `record_limit` | `pos_integer` |  | If set, any given run of the scheduler will only ever schedule this many items maximum |
| `worker_priority` | `non_neg_integer` | 2 | A number from 0 to 3, where 0 is the highest priority and 3 is the lowest. |
| `scheduler_priority` | `non_neg_integer` | 3 | A number from 0 to 3, where 0 is the highest priority and 3 is the lowest. |
| `max_scheduler_attempts` | `pos_integer` | 1 | How many times to attempt scheduling of the triggered action. |
| `max_attempts` | `pos_integer` | 1 | How many times to attempt the job. After all attempts have been exhausted, the scheduler may just reschedule it. Use the `on_error` action to update the record to make the scheduler no longer apply. |
| `read_metadata` | `(any -> any)` |  | Takes a record, and returns metadata to be given to the update action as an argument called `metadata`. |
| `state` | `:active \| :paused \| :deleted` | :active | Describes the state of the cron job. See the getting started guide for more information. The most important thing is that you *do not remove a trigger from a resource if you are using oban pro*. |
| `read_action` | `atom` |  | The read action to use when querying records. Defaults to the primary read. This action *must* support keyset pagination. |
| `worker_read_action` | `atom` |  | The read action to use when fetching the individual records for the trigger. Defaults to `read_action`. If you customize this, ensure your action handles scenarios where the trigger is no longer relevant. |
| `where` | ``any`` |  | The filter expression to determine if something should be triggered |
| `on_error` | `atom` |  | An update action to call after the last attempt has failed. See the getting started guide for more. |





### Introspection

Target: `AshOban.Trigger`