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    <p>Hi to accomplish what you need to do, there are a few easy steps to follow: 1) In the model classes (Incident and Person classes in your case) make sure you put something like this:</p> <pre><code>class Incident &lt; ActiveRecord::Base has_and_belongs_to_many :people # Note if you want to be able to remove a person from the Incident form (to de-associate) put true in :allow_destroy =&gt; true on the accepts_nested_attributes_for accepts_nested_attributes_for :people, :allow_destroy =&gt; false, :reject_if =&gt; :all_blank validates_associated :people #so you won't be able to save invalid people objects attr_accessible :date_occur, :location, :people_attributes # note the :people_attributes here #do your Incident validations as usual... end class Person &lt; ActiveRecord::Base has_and_belongs_to_many :incidents #the following line it's to allow mass assignment, basically it will allow you to create people from the Incident form attr_accessible :first_name, :last_name, :dob #do your Person validations as usual... end </code></pre> <p>2) In the view side, the easiest way will be modifying the Incident form file (app/view/incidents/_form.html.erb) to allow the user to assign existing and create new people to the Incident:</p> <pre><code># app/view/incidents/_form.html.erb &lt;%= semantic_form_for(@incident) do |f| %&gt; &lt;% if @incident.errors.any? %&gt; &lt;div id="error_explanation"&gt; &lt;h2&gt;&lt;%= pluralize(@incident.errors.count, "error") %&gt; prohibited this incident from being saved:&lt;/h2&gt; &lt;ul&gt; &lt;% @incident.errors.full_messages.each do |msg| %&gt; &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt; &lt;% end %&gt; &lt;/ul&gt; &lt;/div&gt; &lt;% end %&gt; &lt;div class="field"&gt; &lt;%= f.label :date_occur %&gt;&lt;br /&gt; &lt;%= f.datetime_select :date_occur %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :location %&gt;&lt;br /&gt; &lt;%= f.text_field :location %&gt; &lt;/div&gt; &lt;%= f.input :people, :as =&gt; :select, :collection=&gt;Hash[Person.all.map { |p| [p.first_name + ' - ' + p.last_name, p.id] }] %&gt; &lt;%= f.fields_for :people, Person.new() do |new_person_form| %&gt; &lt;div class="incident-people new-person"&gt; &lt;%= new_person_form.inputs :name=&gt;'Add New person' do %&gt; &lt;%= new_person_form.input :first_name, :label=&gt;'First Name: ' %&gt; &lt;%= new_person_form.input :last_name, :label=&gt;'Last Name: ' %&gt; &lt;%= new_person_form.input :dob, :label=&gt;'Date of birth: ' %&gt; &lt;% end %&gt; &lt;/div&gt; &lt;% end %&gt; &lt;div class="actions"&gt; &lt;%= f.submit %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>3) Lastly, you need to modify your update and create methods for the Incident controller as follow:</p> <pre><code># app/controllers/incident_controller.rb def create selected_people = params[:incident][:person_ids].keep_if{ |v| v.present? } params[:incident].delete(:person_ids) @incident = Incident.new(params[:incident]) @incident.people = Person.find( selected_people ) respond_to do |format| if @incident.save format.html { redirect_to @incident, notice: 'Incident was successfully created.' } format.json { render json: @incident, status: :created, location: @incident } else format.html { render action: "new" } format.json { render json: @incident.errors, status: :unprocessable_entity } end end end def update selected_people = params[:incident][:person_ids].keep_if{ |v| v.present? } params[:incident].delete(:person_ids) @incident = Incident.find(params[:id]) @incident.people = Person.find( selected_people ) respond_to do |format| if @incident.update_attributes(params[:incident]) format.html { redirect_to @incident, notice: 'Incident was successfully updated.' } format.json { head :no_content } else format.html { render action: "edit" } format.json { render json: @incident.errors, status: :unprocessable_entity } end end end </code></pre> <p>And that's it, let me know if you need further help. FedeX</p>
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    1. COHi Fedex, thanks for the help. Not sure though that I am understanding correctly. Does this code allow the user to select an existing person for the incident? If so, I'm not following. Where is that?
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    2. COMy bad snowguy, I totally forgot you need that hehe! Please have a look now, I updated my answer with all what you need!
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    3. COI need to study a bit but looks like just what I am looking for. Thanks for your help!
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