Grouped collection input

[semaperepelitsa]

I wanted to add grouped collection input so that you could do f.association :category, :collection => Category.roots, :group_method => :children. Rails has grouped_collection_select alongside with collection_select so it should be pretty similar to existing collection input.

The only thing I don't know how to deal with is how SimpleForm maps inputs to classes. Right now every input with collection option maps to select input type which maps to CollectionInput. I wish every input with group_method option map to the same select input type but also somehow map it to GroupedCollectionInput.

Do you like my idea and do you have any suggestions on the problem? Thanks.

[josevalim]

Nice. I would just recommend that instead of checking :group_method, we could simply use :as to specify it:

f.input :authors, :as => :group_select, :collection => some_array

And then instead of having :group_method, we would simply use :value_method and :label_method which are already the official API used by collections.

[rafaelfranca]

We don't need this input_type here, neither send. You can call only

@builder.grouped_collection_select(attribute_name, collection,
                                   group_method, group_label_method, value_method, label_method,
                                   input_options, input_html_options)

[semaperepelitsa]

Good point, I will do that. Do you think group_select is a good name? I would call it grouped_select because you can't select groups actually and also Rails calls it grouped_collection_select.

[josevalim]

+1 for grouped_select