Posted over 3 years ago. Visible to the public. Repeats.

A non-weird replacement for grouped_collection_select

Rails comes with grouped_collection_select that appears to be useful, but isn't.

As an alternative, consider the flat_grouped_collection_select found below. It takes a third argument that extracts the group from each element in the collection:

= form.flat_grouped_collection_select :user_id, users, :department, :id, :full_name

Here is the monkey-patch:

class ActionView::Helpers::FormBuilder def flat_grouped_collection_select(field, collection, group_label_method, value_method, label_method, options = {}, html_options = {}) hash = collection.group_by(&group_label_method).collect_hash do |group_label, group_entries| list_of_pairs = group_entries.collect { |entry| [entry.send(label_method), entry.send(value_method).to_s] } [group_label, list_of_pairs] end options_options = options.slice(:prompt) selected_key = object.send(field).to_s select(field, @template.grouped_options_for_select(hash, selected_key, options_options), options, html_options) end end

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

Owner of this card:

Henning Koch
Last edit:
over 1 year ago
by Henning Koch
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
License for source code
Posted by Henning Koch to makandra dev
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