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ash_phoenix
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Utilities for integrating Ash and Phoenix
Current section
Files
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Current section
Files
usage-rules/union_forms.md
<!--
SPDX-FileCopyrightText: 2020 Zach Daniel
SPDX-License-Identifier: MIT
-->
# Union Forms
AshPhoenix supports forms for union types, allowing different inputs based on the selected type.
```heex
<.inputs_for :let={fc} field={@form[:content]}>
<.input
field={fc[:_union_type]}
phx-change="type-changed"
type="select"
options={[Normal: "normal", Special: "special"]}
/>
<%= case fc.params["_union_type"] do %>
<% "normal" -> %>
<.input type="text" field={fc[:body]} />
<% "special" -> %>
<.input type="text" field={fc[:text]} />
<% end %>
</.inputs_for>
```
In your LiveView:
```elixir
def handle_event("type-changed", %{"_target" => path} = params, socket) do
new_type = get_in(params, path)
path = :lists.droplast(path)
form =
socket.assigns.form
|> AshPhoenix.Form.remove_form(path)
|> AshPhoenix.Form.add_form(path, params: %{"_union_type" => new_type})
{:noreply, assign(socket, :form, form)}
end
```