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ash/documentation/dsls/DSL:-Ash.Reactor.md
James Harton 86d74ed789
feat(Ash.Reactor): Add a Reactor extension that makes working with resources easy. (#683) 
* feat: Add `Ash.Reactor` with create support.

* improvement: Add `Ash.Reactor` update support.

* improvement: Add `Ash.Reactor` destroy support.

* improvement(Ash.Reactor): Support for transactional handling of notifications.

* improvement(Ash.Reactor): Add `read` and `get` steps.

* docs: Add the beginnings of a Reactor topic.

* improvement(Ash.Reactor): add support for generic actions.

* improvement: Add `undo` capability to `create` step.

* improvement: transaction and undo working.

* docs: Start documenting undo behaviour.

* chore: Update to Reactor 0.6.

* improvement: Automatically thread Ash tracers through Reactor.

* improvement(Ash.Reactor): Add undo to generic actions.

* docs: Improve reactor documentation.

* fix: Mimic copying `Ash.Notifier` seems to break the compiler for some reason.
2024-03-02 10:26:25 +13:00

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<!--
This file was generated by Spark. Do not edit it by hand.
-->
# DSL: Ash.Reactor
`Ash.Reactor` is a [`Reactor`](https://hex.pm/packages/reactor) extension
which provides steps for working with Ash resources and actions.
See the [Ash Reactor Guide](https://hexdocs.pm/ash/reactor.html) for more
information.
## ash
Ash-related configuration for the `Ash.Reactor` extension
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`default_api`](#ash-default_api){: #ash-default_api } | `module` | | An API to use by default when calling actions |
## reactor.action
```elixir
action name, resource, action \\ nil
```
Declares a step that will call a generic action on a resource.
### Nested DSLs
* [actor](#reactor-action-actor)
* [inputs](#reactor-action-inputs)
* [tenant](#reactor-action-tenant)
* [wait_for](#reactor-action-wait_for)
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-action-name){: #reactor-action-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-action-resource){: #reactor-action-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-action-action){: #reactor-action-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`api`](#reactor-action-api){: #reactor-action-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-action-async?){: #reactor-action-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-action-authorize?){: #reactor-action-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-action-description){: #reactor-action-description } | `String.t` | | A description for the step |
| [`undo_action`](#reactor-action-undo_action){: #reactor-action-undo_action } | `atom` | | The name of the action to call on the resource when the step is to be undone. |
| [`undo`](#reactor-action-undo){: #reactor-action-undo } | `:always \| :never \| :outside_transaction` | `:never` | What to do when the reactor is undoing it's work? * `always` - The undo action will always be run. * `never` - The action will never be undone. * `outside_transaction` - The action will only be undone if not running inside a transaction. |
## reactor.action.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-action-actor-source){: #reactor-action-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-action-actor-transform){: #reactor-action-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.action.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-action-inputs-template){: #reactor-action-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-action-inputs-transform){: #reactor-action-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.action.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-action-tenant-source){: #reactor-action-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-action-tenant-transform){: #reactor-action-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.action.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-action-wait_for-names){: #reactor-action-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Action`
## reactor.create
```elixir
create name, resource, action \\ nil
```
Declares a step that will call a create action on a resource.
### Nested DSLs
* [actor](#reactor-create-actor)
* [inputs](#reactor-create-inputs)
* [tenant](#reactor-create-tenant)
* [wait_for](#reactor-create-wait_for)
### Examples
```
create :create_post, MyApp.Post, :create do
inputs %{
title: input(:post_title),
author_id: result(:get_user, [:id])
}
actor result(:get_user)
tenant result(:get_organisation, [:id])
end
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-create-name){: #reactor-create-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-create-resource){: #reactor-create-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-create-action){: #reactor-create-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`api`](#reactor-create-api){: #reactor-create-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-create-async?){: #reactor-create-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-create-authorize?){: #reactor-create-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-create-description){: #reactor-create-description } | `String.t` | | A description for the step |
| [`undo_action`](#reactor-create-undo_action){: #reactor-create-undo_action } | `atom` | | The name of the action to call on the resource when the step is to be undone. |
| [`undo`](#reactor-create-undo){: #reactor-create-undo } | `:always \| :never \| :outside_transaction` | `:never` | What to do when the reactor is undoing it's work? * `always` - The undo action will always be run. * `never` - The action will never be undone. * `outside_transaction` - The action will only be undone if not running inside a transaction. |
| [`upsert_identity`](#reactor-create-upsert_identity){: #reactor-create-upsert_identity } | `atom` | | The identity to use for the upsert |
| [`upsert?`](#reactor-create-upsert?){: #reactor-create-upsert? } | `boolean` | `false` | Whether or not this action should be executed as an upsert. |
## reactor.create.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-create-actor-source){: #reactor-create-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-create-actor-transform){: #reactor-create-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.create.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-create-inputs-template){: #reactor-create-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-create-inputs-transform){: #reactor-create-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.create.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-create-tenant-source){: #reactor-create-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-create-tenant-transform){: #reactor-create-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.create.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-create-wait_for-names){: #reactor-create-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Create`
## reactor.destroy
```elixir
destroy name, resource, action \\ nil
```
Declares a step that will call a destroy action on a resource.
### Nested DSLs
* [actor](#reactor-destroy-actor)
* [inputs](#reactor-destroy-inputs)
* [tenant](#reactor-destroy-tenant)
* [wait_for](#reactor-destroy-wait_for)
### Examples
```
destroy :delete_post, MyApp.Post, :destroy do
initial input(:post)
actor result(:get_user)
tenant result(:get_organisation, [:id])
end
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-destroy-name){: #reactor-destroy-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-destroy-resource){: #reactor-destroy-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-destroy-action){: #reactor-destroy-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`initial`](#reactor-destroy-initial){: #reactor-destroy-initial .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | The record to update. |
| [`api`](#reactor-destroy-api){: #reactor-destroy-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-destroy-async?){: #reactor-destroy-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-destroy-authorize?){: #reactor-destroy-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-destroy-description){: #reactor-destroy-description } | `String.t` | | A description for the step |
| [`return_destroyed?`](#reactor-destroy-return_destroyed?){: #reactor-destroy-return_destroyed? } | `boolean` | `false` | Whether or not the step should return the destroyed record upon completion. |
| [`undo_action`](#reactor-destroy-undo_action){: #reactor-destroy-undo_action } | `atom` | | The name of the action to call on the resource when the step is undone. |
| [`undo`](#reactor-destroy-undo){: #reactor-destroy-undo } | `:always \| :never \| :outside_transaction` | `:never` | What to do when the reactor is undoing it's work? * `always` - The undo action will always be run. * `never` - The action will never be undone. * `outside_transaction` - The action will only be undone if not running inside a transaction. |
## reactor.destroy.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-destroy-actor-source){: #reactor-destroy-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-destroy-actor-transform){: #reactor-destroy-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.destroy.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-destroy-inputs-template){: #reactor-destroy-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-destroy-inputs-transform){: #reactor-destroy-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.destroy.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-destroy-tenant-source){: #reactor-destroy-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-destroy-tenant-transform){: #reactor-destroy-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.destroy.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-destroy-wait_for-names){: #reactor-destroy-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Destroy`
## reactor.get
```elixir
get name, resource, action \\ nil
```
Declares a step that will call a read action on a resource retuning a single record.
### Nested DSLs
* [actor](#reactor-get-actor)
* [inputs](#reactor-get-inputs)
* [tenant](#reactor-get-tenant)
* [wait_for](#reactor-get-wait_for)
### Examples
```
get :post_by_id, MyApp.Post, :read do
inputs %{id: input(:post_id)}
end
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-get-name){: #reactor-get-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-get-resource){: #reactor-get-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-get-action){: #reactor-get-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`api`](#reactor-get-api){: #reactor-get-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-get-async?){: #reactor-get-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-get-authorize?){: #reactor-get-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-get-description){: #reactor-get-description } | `String.t` | | A description for the step |
| [`fail_on_not_found?`](#reactor-get-fail_on_not_found?){: #reactor-get-fail_on_not_found? } | `boolean` | `false` | When set to true the step will fail if the resource is not found. |
## reactor.get.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-get-actor-source){: #reactor-get-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-get-actor-transform){: #reactor-get-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.get.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-get-inputs-template){: #reactor-get-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-get-inputs-transform){: #reactor-get-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.get.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-get-tenant-source){: #reactor-get-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-get-tenant-transform){: #reactor-get-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.get.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-get-wait_for-names){: #reactor-get-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Get`
## reactor.read
```elixir
read name, resource, action \\ nil
```
Declares a step that will call a read action on a resource.
### Nested DSLs
* [actor](#reactor-read-actor)
* [inputs](#reactor-read-inputs)
* [tenant](#reactor-read-tenant)
* [wait_for](#reactor-read-wait_for)
### Examples
```
read :read_posts, MyApp.Post, :read
```
```
read :read_posts_in_range, MyApp.Post, :read_in_range do
inputs %{min_date: input(:min_date), max_date: input(:max_date)}
end
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-read-name){: #reactor-read-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-read-resource){: #reactor-read-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-read-action){: #reactor-read-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`api`](#reactor-read-api){: #reactor-read-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-read-async?){: #reactor-read-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-read-authorize?){: #reactor-read-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-read-description){: #reactor-read-description } | `String.t` | | A description for the step |
## reactor.read.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-read-actor-source){: #reactor-read-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-read-actor-transform){: #reactor-read-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.read.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-read-inputs-template){: #reactor-read-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-read-inputs-transform){: #reactor-read-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.read.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-read-tenant-source){: #reactor-read-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-read-tenant-transform){: #reactor-read-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.read.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-read-wait_for-names){: #reactor-read-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Read`
## reactor.transaction
```elixir
transaction name, resources
```
Creates a group of steps which will be executed inside a data layer transaction.
### Nested DSLs
* [wait_for](#reactor-transaction-wait_for)
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-transaction-name){: #reactor-transaction-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resources`](#reactor-transaction-resources){: #reactor-transaction-resources .spark-required} | `module \| list(module)` | | A resource or list of resources to consider in the transaction. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`return`](#reactor-transaction-return){: #reactor-transaction-return } | `atom` | | The name of the step whose result will be returned as the return value of the transaction. |
| [`timeout`](#reactor-transaction-timeout){: #reactor-transaction-timeout } | `pos_integer \| :infinity` | `15000` | How long to allow the transaction to run before timing out. |
## reactor.transaction.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-transaction-wait_for-names){: #reactor-transaction-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Transaction`
## reactor.update
```elixir
update name, resource, action \\ nil
```
Declares a step that will call an update action on a resource.
### Nested DSLs
* [actor](#reactor-update-actor)
* [inputs](#reactor-update-inputs)
* [tenant](#reactor-update-tenant)
* [wait_for](#reactor-update-wait_for)
### Examples
```
update :publish_post, MyApp.Post, :update do
initial input(:post)
inputs %{
published: value(true)
}
actor result(:get_user)
tenant result(:get_organisation, [:id])
end
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`name`](#reactor-update-name){: #reactor-update-name .spark-required} | `atom` | | A unique name for the step. This is used when choosing the return value of the Reactor and for arguments into other steps. |
| [`resource`](#reactor-update-resource){: #reactor-update-resource .spark-required} | `module` | | The resource to call the action on. |
| [`action`](#reactor-update-action){: #reactor-update-action } | `atom` | | The name of the action to call on the resource. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`initial`](#reactor-update-initial){: #reactor-update-initial .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | The record to update. |
| [`api`](#reactor-update-api){: #reactor-update-api } | `module` | | The API to use when calling the action. Defaults to the API set in the `ash` section. |
| [`async?`](#reactor-update-async?){: #reactor-update-async? } | `boolean` | `true` | When set to true the step will be executed asynchronously via Reactor's `TaskSupervisor`. |
| [`authorize?`](#reactor-update-authorize?){: #reactor-update-authorize? } | `boolean \| nil` | | Explicitly enable or disable authorization for the action. |
| [`description`](#reactor-update-description){: #reactor-update-description } | `String.t` | | A description for the step |
| [`undo_action`](#reactor-update-undo_action){: #reactor-update-undo_action } | `atom` | | The name of the action to call on the resource when the step is undone. |
| [`undo`](#reactor-update-undo){: #reactor-update-undo } | `:always \| :never \| :outside_transaction` | `:never` | What to do when the reactor is undoing it's work? * `always` - The undo action will always be run. * `never` - The action will never be undone. * `outside_transaction` - The action will only be undone if not running inside a transaction. |
## reactor.update.actor
```elixir
actor source
```
Specifies the action actor
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-update-actor-source){: #reactor-update-actor-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the actor. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-update-actor-transform){: #reactor-update-actor-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the actor before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Actor`
## reactor.update.inputs
```elixir
inputs template
```
Specify the inputs for an action
### Examples
```
inputs %{
author: result(:get_user),
title: input(:title),
body: input(:body)
}
```
```
inputs(author: result(:get_user))
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`template`](#reactor-update-inputs-template){: #reactor-update-inputs-template .spark-required} | `%{optional(atom) => Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value} \| keyword(Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value)` | | |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-update-inputs-transform){: #reactor-update-inputs-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which will transform the inputs before executing the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Inputs`
## reactor.update.tenant
```elixir
tenant source
```
Specifies the action tenant
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`source`](#reactor-update-tenant-source){: #reactor-update-tenant-source .spark-required} | `Reactor.Template.Input \| Reactor.Template.Result \| Reactor.Template.Value` | | What to use as the source of the tenant. See `Reactor.Dsl.Argument` for more information. |
### Options
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`transform`](#reactor-update-tenant-transform){: #reactor-update-tenant-transform } | `(any -> any) \| module \| nil` | | An optional transformation function which can be used to modify the tenant before it is passed to the action. |
### Introspection
Target: `Ash.Reactor.Dsl.Tenant`
## reactor.update.wait_for
```elixir
wait_for names
```
Wait for the named step to complete before allowing this one to start.
Desugars to `argument :_, result(step_to_wait_for)`
### Examples
```
wait_for :create_user
```
### Arguments
| Name | Type | Default | Docs |
|------|------|---------|------|
| [`names`](#reactor-update-wait_for-names){: #reactor-update-wait_for-names .spark-required} | `atom \| list(atom)` | | The name of the step to wait for. |
### Introspection
Target: `Reactor.Dsl.WaitFor`
### Introspection
Target: `Ash.Reactor.Dsl.Update`
<style type="text/css">.spark-required::after { content: "*"; color: red !important; }</style>
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