create-resource-action
Use when creating Backpex resource actions for global operations like bulk exports, invitations, imports, or any action that applies to the resource as a whole rather than individual items.
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- create-resource-action
- description
- Use when creating Backpex resource actions for global operations like bulk exports, invitations, imports, or any action that applies to the resource as a whole rather than individual items.
# Creating Backpex Resource Actions
You are an expert at creating resource actions for Backpex. Resource actions operate on the resource as a whole (not individual items) and appear as buttons in the index toolbar. They open a slide-over with a form.
## Required Callbacks
| Callback | Signature | Description |
|----------|-----------|-------------|
| `title/0` | `-> string` | Slide-over title |
| `label/0` | `-> string` | Button text in index toolbar |
| `fields/0` | `-> keyword list` | Form field definitions |
| `changeset/3` | `(change, attrs, metadata) -> changeset` | Validate form data. `metadata` has `:assigns` and `:target` keys |
| `handle/2` | `(socket, data) -> {:ok, socket} \| {:error, changeset}` | Execute the action with validated data |
## Optional Callbacks
| Callback | Default | Description |
|----------|---------|-------------|
| `base_schema/1` | schemaless changeset | Override to use a real Ecto schema |
## Example: Simple Resource Action
```elixir
defmodule MyAppWeb.ResourceActions.InviteUser do
use Backpex.ResourceAction
import Ecto.Changeset
@impl Backpex.ResourceAction
def title, do: "Invite User"
@impl Backpex.ResourceAction
def label, do: "Invite"
@impl Backpex.ResourceAction
def fields do
[
email: %{
module: Backpex.Fields.Text,
label: "Email",
type: :string
},
role: %{
module: Backpex.Fields.Select,
label: "Role",
options: [Admin: "admin", User: "user"],
prompt: "Select role...",
type: :string
}
]
end
@impl Backpex.ResourceAction
def changeset(change, attrs, _metadata) do
change
|> cast(attrs, [:email, :role])
|> validate_required([:email, :role])
|> validate_format(:email, ~r/@/)
end
@impl Backpex.ResourceAction
def handle(socket, data) do
case MyApp.Accounts.send_invitation(data.email, data.role) do
:ok ->
{:ok, Phoenix.LiveView.put_flash(socket, :info, "Invitation sent to #{data.email}.")}
{:error, reason} ->
{:ok, Phoenix.LiveView.put_flash(socket, :error, "Failed: #{reason}")}
end
end
end
```
## Example: Export Action
```elixir
defmodule MyAppWeb.ResourceActions.ExportPosts do
use Backpex.ResourceAction
import Ecto.Changeset
@impl Backpex.ResourceAction
def title, do: "Export Posts"
@impl Backpex.ResourceAction
def label, do: "Export"
@impl Backpex.ResourceAction
def fields do
[
format: %{
module: Backpex.Fields.Select,
label: "Format",
options: [CSV: "csv", JSON: "json"],
prompt: "Select format...",
type: :string
}
]
end
@impl Backpex.ResourceAction
def changeset(change, attrs, _metadata) do
change
|> cast(attrs, [:format])
|> validate_required([:format])
|> validate_inclusion(:format, ["csv", "json"])
end
@impl Backpex.ResourceAction
def handle(socket, data) do
# Trigger export...
{:ok, Phoenix.LiveView.put_flash(socket, :info, "Export started in #{data.format} format.")}
end
end
```
## Wiring Into a LiveResource
```elixir
@impl Backpex.LiveResource
def resource_actions do
[
invite: %{module: MyAppWeb.ResourceActions.InviteUser},
export: %{module: MyAppWeb.ResourceActions.ExportPosts}
]
end
```
The keyword key (e.g. `:invite`) is used as the action identifier for routing and authorization via `can?/3`.
## Key Differences From Item Actions
| Aspect | Resource Action | Item Action |
|--------|----------------|-------------|
| Scope | Whole resource | Selected items |
| UI | Slide-over form | Modal dialog |
| Callbacks | `title/0`, `label/0`, `handle/2` | `icon/2`, `label/2`, `handle/3` |
| Form | Always has fields | Optional |
| Location | Index toolbar only | Row, index toolbar, show page |
## Conventions
- **File location**: `lib/my_app_web/resource_actions/<snake_case_name>.ex`
- **Module naming**: `MyAppWeb.ResourceActions.<ActionName>`
- **Always include `type:` key** in each field map (e.g. `type: :string`). This is required for the schemaless changeset to work.
- **Authorization** is handled via `can?(assigns, :action_key, nil)` in the LiveResource (item is always `nil`)
- **Return `{:error, changeset}`** from `handle/2` to keep the form open and show validation errors
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