Coocon: Allow to use with simple arrays without AR

gistfile1.txt

I'm using my branch now in the project which works perfectly fine so far.

The only additional glue to use it with fully transient models are those few methods: new_record?, marked_for_destruction? and _destroy.

I'm not sure why cocoon touches the _destroy method.

The example above allows using fully transient models (non-ActiveRecord) with cocoon and any form builder.

I'll put everything together for a comprehensive example:

Model:

Requirements are:

all objects must be ActiveModel-compliant (eg, plain ActiveModel, Virtus, ActiveAttr etc)
implement the new_record?, marked_for_destruction? and _destroy methods on the nested object
implement build_<nested_name> (as in, build_user) to return a new template
implement <nested_nameS>_attribtues= (as in, users_attribtues=) to parse the POSTed data and update the nested items appropriately.
Full implementation:

class User
  include ActiveAttr::Model
  attribute :email
end

class Company
  include ActiveAttr::Model
  attribute :name

  def users
    @users ||= []
  end



  def users_attributes=(attrs)
    @users = attrs.map { |key, params| User.new(params) }
  end

  def build_user
    User.new # blank state for new template
  end


  def new_record?
    true
  end

  def marked_for_destruction?
    false
  end

  def _destroy
    false
  end

end
Views

The view will look like a regular one that uses ActiveModel (in my case, it's a simple form builder):

= simple_form_for @company, as: :company, url: company_path(@company), method: :put do |f|
  = f.input :name
  %h2 Users
  = link_to_add_association '+', f, :users , 'data-association-insertion-node' => '#users', 'data-association-insertion-method' => 'append'
  #users
    = f.simple_fields_for :users, @company.users do |user_form|
      = render 'user_fields', f: user_form
where user_fields may look like:

%h3 User details
f.input :name
= link_to_remove_association "X", f

____

<% @server.interfaces.each do |interface| %>
  <div>
  <%= f.fields_for :interfaces, OpenStruct.new(interface), index: "" do |interface_form| %>
    <%= render "interface_fields", f: interface_form %>
  <% end %>
  </div>
<% end %>

____