Add collection actions support

[yagudaev]

It would be nice to have support for collection actions NOT just member action as already described in the documentation.

ActiveAdmin has those https://activeadmin.info/8-custom-actions.html#collection-actions so we can emulate that design.

It is really useful to be able to import/export records.

Looking at the trestle code, I see we are using toolbar(:primary) in the ERB template to render the toolbar. Maybe something like this:

Trestle.resource(:post) do
  toolbar do
     default_buttons
     link_to "Custom Action", admin.path(:post, model, :custom_action), className: 'fa fa-custom`
  end
end

Relates to #185

[metronom72]

Is this issue exists in the roadmap?

[McRipper]

Would be very usefull, someone can point out how the code can be extended to support this, it's not easy to understand but I'm willing to help

[nir0]

hello guys, just wanted to post a workaround:

app/admin/clients_admin.rb:

Trestle.resource(:clients) do
  controller do 
    def export
      # ...
    end
  end

  routes do
    get :export, on: :collection
  end
end

app/views/admin/clients/index.html.haml:

...
- toolbar(:primary) do |t| 
  = t.link('Export', export_clients_admin_index_path)
...

you can find full source of this file here: https://github.com/TrestleAdmin/trestle/blob/master/app/views/trestle/resource/index.html.erb

[McRipper]

I've found an easy solution without the need of a custom template:

Trestle.resource(:properties) do
  ...
  hook("resource.index.header") do
    content_tag(:div, style: "order: 2;align-self: center;") do
      link_to(button_tag("Export", icon: 'fa fa-file', class: "btn btn-primary"), export_properties_admin_index_path(format: :xlsx), target: :_blank)
    end
  end
  ...
end

[asad-ali-bhatti]

I found another workaround which adds new buttons/links to proper toolbar instead of table's toolbar.

  controller do
    def index
      toolbar(:primary) do |t|
        t.link(button_tag("+ From Template", icon: 'fa fa-file'), admin.path(:new_organization))
      end
    end
  end

  routes do
    get :new_organization, on: :collection
  end

[coezbek]

One issue with this is that it does not integrate with the scopes features.