how to set default value of select_tag in rails? instance variable -


i have controller action: 

class candidatescontroller < applicationcontroller   helper_method :current_or_guest_user    def show     # authorize! :read, @user     @candidate = candidate.friendly.find(params[:id])     @candidates = candidate.all     if request.path != candidate_path(@candidate)       redirect_to @candidate, notice: 'moved permanently'     end     @comparison = usercomparisonservice.new(current_user, @candidate)     @contact = contactcandidate.new(candidate_email: @candidate.email)   end

this calls partial render on show page , passes @candidate instance variable:

 = render 'users/compare', :candidate => @candidate

this form within partial: 

profile-searchbar.text-left         = form_tag(compare_path, method: 'get', remote: true, id: 'compare_form')           = select_tag "v_friend_id", options_from_collection_for_select(@candidates, :id, :full_name, @comparison.v_friend.id), :include_blank => true, :class => "compare-search", :style => "width:100%; margin-left: 3px   %a.compare_btn{:href => "javascript:void(0)"}

this select dropdown works candidate.all method in controller, how set default value of candidates @candidate, can take away dropdown / search , have compare candidate's page on?

this apidock

select_tag "people", options_from_collection_for_select(@people, "id", "name", "1")

and output is:

<select id="people" name="people"><option value="1" selected="selected">david</option></select>

as can see, id passed fourth element on options_from_collection_for_select instead of @comparison.v_friend.id think have use @candidate.id


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