Generate button with html template for dynamic form addition.

dynamic_form_helper.rb

# frozen_string_literal: true

module DynamicFormHelper
  def link_to_add_association(label, options = {}, partial:, form:, association:, association_type:)
    format = options.fetch(:format, '')
    new_object = form.object.send(association).klass.new
    template_opts = {
      locals: {
        form: form,
        format: format,
        label: label,
        association: association,
        new_object: new_object,
        id: new_object.object_id
      },
      data: { id: new_object.object_id }
    }
    render_opts = {
      class: 'btn btn-sm btn-primary',
      'data-template-type': association.to_s,
      'data-template-for-insertion':
        CGI.escapeHTML(
          render(partial: partial, **template_opts)
      ),
      'data-id': new_object.object_id,
      'data-association-type': association_type,
      'data-content-type': association.to_s
    }
    link_to label, '#', render_opts
  end
end