AF
Ash Framework•3mo ago
forest

Using add_form with a many_to_many relationship

Trying to use add_form on a many_to_many relationship. Here is my action and relationship. 
    create :create_campaign_target_list do
      primary? true
      accept [:name]

      argument :members, {:array, :map}, allow_nil?: true

      change manage_relationship(:members, type: :append_and_remove, debug?: true)
    end

    many_to_many :members, MyApp.Organizations.Organization do
      through MyApp.Organizations.CampaignTargetListOrganization
      source_attribute_on_join_resource :campaign_target_list_id
      destination_attribute_on_join_resource :organization_id
    end
  end
    create :create_campaign_target_list do
      primary? true
      accept [:name]

      argument :members, {:array, :map}, allow_nil?: true

      change manage_relationship(:members, type: :append_and_remove, debug?: true)
    end

    many_to_many :members, MyApp.Organizations.Organization do
      through MyApp.Organizations.CampaignTargetListOrganization
      source_attribute_on_join_resource :campaign_target_list_id
      destination_attribute_on_join_resource :organization_id
    end
  end
I using add_form to add an Organization as a member after search for one. 
  def handle_event("add-form", %{"path" => path, "organization_id" => organization_id}, socket) do
    form =
      AshPhoenix.Form.add_form(socket.assigns.form, path, params: %{id: organization_id}, type: :read)

    {:noreply, assign(socket, :form, form)}
  end
  def handle_event("add-form", %{"path" => path, "organization_id" => organization_id}, socket) do
    form =
      AshPhoenix.Form.add_form(socket.assigns.form, path, params: %{id: organization_id}, type: :read)

    {:noreply, assign(socket, :form, form)}
  end
And the form: 
            <.inputs_for :let={organization} field={@form[:members]}>
              <li class="list-row">
                <.input field={organization[:name]} label="Name" disabled />
              </li>
            </.inputs_for>
            <.inputs_for :let={organization} field={@form[:members]}>
              <li class="list-row">
                <.input field={organization[:name]} label="Name" disabled />
              </li>
            </.inputs_for>
If there are existing members then they will render fine and there are hidden inputs as expected, but any member I added via add_form does not have the id added as a hidden field. It is in the params. I don't want to create Organizations in the nested form only associate them via the members many_to_many relationship.
3 Replies
forest
forestOP•3mo ago
The other thing I notices is that I can't even save the CampaignTargetList when I just change the name. The existing members have errors with any changes. 
           forms: %{
             _update: #AshPhoenix.Form<
               resource: MyApp.Organizations.CampaignTargetListOrganization,
               action: :create,
               source: #Ash.Changeset<
                 domain: MyApp.Organizations,
                 action: :create,
                 errors: [
                   %Ash.Error.Changes.Required{
                     field: :organization_id,
                     resource: MyApp.Organizations.CampaignTargetListOrganization,
                     class: :invalid
                   },
                   %Ash.Error.Changes.Required{
                     field: :campaign_target_list_id,
                     type: :attribute,
                     resource: MyApp.Organizations.CampaignTargetListOrganization,
                     class: :invalid
                   }
                 ],
                 data: %MyApp.Organizations.CampaignTargetListOrganization{
           forms: %{
             _update: #AshPhoenix.Form<
               resource: MyApp.Organizations.CampaignTargetListOrganization,
               action: :create,
               source: #Ash.Changeset<
                 domain: MyApp.Organizations,
                 action: :create,
                 errors: [
                   %Ash.Error.Changes.Required{
                     field: :organization_id,
                     resource: MyApp.Organizations.CampaignTargetListOrganization,
                     class: :invalid
                   },
                   %Ash.Error.Changes.Required{
                     field: :campaign_target_list_id,
                     type: :attribute,
                     resource: MyApp.Organizations.CampaignTargetListOrganization,
                     class: :invalid
                   }
                 ],
                 data: %MyApp.Organizations.CampaignTargetListOrganization{
Rebecca Le
Rebecca Le•3mo ago
You might find this guide useful, its not published yet - https://ash-project.github.io/ash_phoenix/forms-for-relationships-between-existing-records.html basically, you want to be working with IDs of the related records, not maps
forest
forestOP•3mo ago
thank you. I will give it a try. This works and makes much more sense to work with IDs.

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