input collection formular element

input_collection.rb

require 'formular/elements'
class InputCollection < Input
  set_default :include_hidden, true

  html do |element|
    concat element.collection.map { |item|
      item.to_html(context: :default)
    }.join('')
    concat element.hidden_tag
  end

  def hidden_tag
    return '' unless options[:include_hidden]
    Hidden.(value: "", name: options[:name]).to_s
  end
  
  def collection
    base_options = collection_base_options
    @collection ||= options[:collection].map do |item|
      opts = base_options.dup
      opts[:value] = item

      opts[:id] = if options[:id]
        "#{options[:id]}_#{opts[:value]}"
      else
        "#{attribute_name || options[:name].gsub('[]', '')}_#{opts[:value]}"
      end

      self.class.(opts)
    end
  end

  private

  # append the [] to name so the param comes through correctly
  def form_encoded_name
    super + '[]'
  end

  def collection_base_options
    opts = attributes.select { |k, v| ![:name, :id, :value, :class].include?(k) }
    # FIXME due to class merging, we'll end up with duplicate classes...
    opts[:attribute_name] = attribute_name if attribute_name
    opts[:builder]        = builder if builder
    opts[:name]           = options[:name] if options[:name] # do we need this??
    opts[:include_hidden] = false
    opts
  end
end # class InputCollection