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    <p>Okay ... in case anyone was interested I solved the two issues with the following:</p> <ol> <li><p>Used the collect capabilities on the class rather than any simple_form helpers, so the Games View Form Partial had the following changes to the collection line:</p> <pre><code>&lt;%= builder.input :team_id, :collection =&gt; Team.all.collect{ |t| [t.full_name, t.id ]}%&gt; </code></pre></li> <li><p>I used a count comparison to set the veriable noting the value of the hidden field. This is not very object code but means that the code works using simple_form helpers and the controller just uses the .save (in create) and update_attributes (in update) without any further code required. Very nice. Also slightly amended the accepts_nested_attributes_for to look for blank team_id rather than game_id (which would never be blank!). So the code now looks as follows...</p></li> </ol> <p>Game Model:</p> <pre><code> class Game &lt; ActiveRecord::Base belongs_to :venue belongs_to :game_type has_and_belongs_to_many :tournaments has_many :participants, :dependent =&gt; :destroy has_many :teams, :through =&gt; :participants validates :kickoff, :venue_id, :presence =&gt; true accepts_nested_attributes_for :participants, :reject_if =&gt; lambda {|a| a[:team_id].blank? }, :allow_destroy =&gt; :true def home_team self.teams.joins(:participants).where("participants.home_team = ?", true).first end def away_team self.teams.joins(:participants).where("participants.home_team = ?", false).first end end </code></pre> <p>Games Controller (New and Create Methods)</p> <pre><code> class GamesController &lt; ApplicationController def new @game = Game.new 2.times { @game.participants.build } respond_to do |format| format.html # new.html.erb end end def create @game = Game.new(params[:game]) respond_to do |format| if @game.save format.html { redirect_to games_path, notice: 'Game was successfully created.' } else format.html { render action: "new" } end end end end </code></pre> <p>Games View Form Partial (actually has another partial but included for ease of reading)</p> <pre><code> &lt;%= simple_form_for(@game) do |f| %&gt; &lt;%= f.error_notification %&gt; &lt;div class="form-inputs"&gt; &lt;% count = 0 %&gt; &lt;%= f.simple_fields_for :participants do |builder| %&gt; &lt;% if count == 0 %&gt; &lt;% value = true %&gt; &lt;% count += 1 %&gt; &lt;% else %&gt; &lt;% value = false%&gt; &lt;% end %&gt; &lt;%= builder.input :home_team, :as =&gt; :hidden, :input_html =&gt; {:value =&gt; value} %&gt; &lt;%= builder.input :team_id, :collection =&gt; Team.all.collect{ |t| [t.full_name, t.id ]}%&gt; &lt;% end %&gt; &lt;%= f.input :home_goals, :input_html =&gt; {:maxlength =&gt; 5, :size =&gt; 5 }%&gt; &lt;%= f.input :away_goals, :input_html =&gt; {:maxlength =&gt; 5, :size =&gt; 5 }%&gt; &lt;%= f.input :kickoff %&gt; &lt;%= f.input :completed %&gt; &lt;%= f.input :game_type_id %&gt; &lt;%= f.input :venue_id ,:collection =&gt; Venue.all, prompt: 'Choose the venue'%&gt; &lt;/div&gt; &lt;div class="form-actions"&gt; &lt;%= f.button :submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>Hope this is of use to someone. I think it's a good solution but would be interested if anyone has suggestions on improving the logic in the View.</p> <p>Regards</p> <p>Peter</p>
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    1. COThanks for this, was helpful to job my memory. I did something similar with cocoon, but i need to add multiple has_many :throughs. This solution would require you to save and add one each time i think.
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