How to set belongs_to on in a form

I have a create action for Plan that sets the Product (Plan belongs_to Product)

    create :create do
      primary? true
      argument :product, :map, allow_nil?: false
      change manage_relationship(:product, :product, type: :append)
    end

    create :create do
      primary? true
      argument :product, :map, allow_nil?: false
      change manage_relationship(:product, :product, type: :append)
    end

I have a form that I create like this...

    create_plan_form =
      AshPhoenix.Form.for_create(Plan, :create, api: Environments)
      |> to_form()
      |> AshPhoenix.Form.add_form([:product])

    create_plan_form =
      AshPhoenix.Form.for_create(Plan, :create, api: Environments)
      |> to_form()
      |> AshPhoenix.Form.add_form([:product])

and then a select input

          <.inputs_for :let={product_form} field={@create_plan_form[:product]}>
            <.input
              type="select"
              field={{product_form, :id}}
              options={@product_options}
              label="Product"
            />
          </.inputs_for>

          <.inputs_for :let={product_form} field={@create_plan_form[:product]}>
            <.input
              type="select"
              field={{product_form, :id}}
              options={@product_options}
              label="Product"
            />
          </.inputs_for>

This raises an error:

product at path [] must be configured in the form to be used with `inputs_for`.

product at path [] must be configured in the form to be used with `inputs_for`.

I tried forms: [auto?: true] and then I don't get an error but I also don't get any field.

2 Replies

michaelst•2y ago

Oh I had this same issue, I ended up using the id field and not inputs for, so try changing your action to product_id and use it as a field instead

Robert GraffOP•2y ago

Thanks @michaelst

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How to set belongs_to on in a form

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