An extension to add form builders to the code interface.

There is currently no DSL for this extension.

This defines a form_to_<name> function for each code interface function. Arguments are processed according to any custom input transformations defined on the code interface, while the params option remains untouched.

The generated function passes all options through to AshPhoenix.Form.for_action/3

Update and destroy actions take the record being updated/destroyed as the first argument.

For example, given this code interface definition on a domain called MyApp.Accounts:

resources do
  resource MyApp.Accounts.User do
    define :register_with_password, args: [:email, :password]
    define :update_user, action: :update, args: [:email, :password]
  end
end

Adding the AshPhoenix extension would define form_to_register_with_password/2.

Custom Input Transformations

If your code interface defines custom inputs with transformations, the form interface will honor those transformations for arguments, but not for params passed via the params option:

# In your domain
resource MyApp.Blog.Comment do
  define :create_with_post do
    action :create_with_post_id
    args [:post]

    custom_input :post, :struct do
      constraints instance_of: MyApp.Blog.Post
      transform to: :post_id, using: & &1.id
    end
  end
end

# Usage - the post argument will be transformed
form = MyApp.Blog.form_to_create_with_post(
  %MyApp.Blog.Post{id: "some-id"},
  params: %{"text" => "Hello world"}
)
# The post struct gets transformed to post_id in the form
# The params remain unchanged

Usage

Without options:

MyApp.Accounts.form_to_register_with_password()
#=> %AshPhoenix.Form{}

With options:

MyApp.Accounts.form_to_register_with_password(params: %{"email" => "placeholder@email"})
#=> %AshPhoenix.Form{}

For update/destroy actions, the record is required as the first parameter:

user = MyApp.Accounts.get_user!(id)
MyApp.Accounts.form_to_update_user(user)
#=> %AshPhoenix.Form{}

Update/destroy with options

user = MyApp.Accounts.get_user!(id)
MyApp.Accounts.form_to_update_user(user, params: %{"email" => "placeholder@email"})
#=> %AshPhoenix.Form{}