Hi,
I've got an issue where I'm creating a form in my view where the user can add a Sponsorship to an Event (m2m relationship using has_many :through). A Sponsorship belongs to an event and also belongs to a sponsor. The sponsor is a polymorphic relationship with either a Partner or a Company. So I have these columns set up:
Event id name date
Sponsorship event_id sponsor_type sponsor_id
I created a view, much like in railscasts 3-part complex forms tutorial where I can dynamically add and remove sponsorships for the event, and there's a <select> field for choosing whether the sponsorship is for a Partner or Company and then I have 2 more <select> fields, one with a list of Partners and one with a list of Companies. I set up virtual attributes in the Event model for :company_id and :partner_id and I have logic in that model as well which wires everything up the best I can (because of the way this is working, I couldn't figure out how to make everything work like magic as in the railscast, but I did get that working for a non-polymorphic relationship elsewhere in the project).
Everything saves fine, but when I render the view, the Company and Partner <select> fields aren't set to the proper values. This is because they're set to use :partner_id and :company_id rather than :sponsor_id.
Is there any way of doing this? anyone know where I'm going wrong?
some sample code:
## the partial => <div class="sponsor"> <% fields_for 'event[sponsor_attributes]', sponsor do |sf| -%> <fieldset> <legend>Sponsor</legend> <%= sf.select(:sponsor_type, @sponsor_types, { :prompt => 'Select a type...' }, :index => nil )%> <div> <%= label_tag 'Candidate:' %> <%= sf.select(:company_id, @companies, {:prompt => 'Choose a company...' }, :index => nil ) %> </div> <div> <%= label_tag 'Partner: ' %> <%= sf.select(:partner_id, @partners, { :prompt => 'Choose a partner...' }, :index => nil ) %> </div>
<% if sponsor.new_record? -%> <%= link_to_function '[-] Remove', "this.up('.sponsor').remove()" %> <% else -%> <%= link_to_function '[-] Remove', "mark_for_destroy(this, 'sponsor')" %> <%= sf.hidden_field :id, :index => nil %> <%= sf.hidden_field :should_destroy, :index => nil, :class => 'should_destroy' %> <% end -%> </fieldset> <% end -%> </div>
## the Event model's important stuff (yes, I know... this is a mess) => def sponsor_attributes=(sponsor_attributes) sponsor_attributes.each do |attrib| unless attrib[:sponsor_type].blank? # it's just an empty field... if attrib[:id].blank? # it's a new sponsorship! s = sponsorships.build() else # it's an existing sponsorship s = sponsorships.detect { |sp| sp.id == attrib[:id].to_i } end
s.sponsor_type = attrib[:sponsor_type]
# load the correct sponsor_id case attrib[:sponsor_type] when 'Company' s.sponsor_id = attrib[:company_id] when 'Partner' s.sponsor_id = attrib[:partner_id] end end end end
If I missed anything, let me know.
Thanks in advance.
...spike
