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    <p>My suggestion:</p> <p>Create a user form to set up the associations between <code>User</code> and <code>Sublocation</code></p> <p>I am assuming the sublocations have been pre-populated?</p> <p><strong>users_controller.rb</strong></p> <pre><code>def new @user = User.new @sublocations = Sublocation.all respond_to do |format| # what ever end end def create @user = User.new(params[:user]) params[:sublocation_ids].each do |key, value| @user.affiliations.build(sublocation_id: value) end respond_to do |format| if @user.save # what ever else # what ever end end end def show @user = User.find(params[:id]) @affiliations = @user.affiliations end def set_default affiliation = Affiliation.find(params[:affiliation_id]) Affiliation.where(user_id: params[:user_id]).update_all(default: false) affiliation.toggle!(:default) redirect_to affiliation.user, notice: "Default sublocation set" end </code></pre> <p><strong>users/_form.html.haml</strong></p> <pre><code>= form_for @user do |f| .field # fields for user attributes .field %h1 Sublocations = f.fields_for "sublocations[]" do - for sublocation in @sublocations = label_tag sublocation.name = check_box_tag "sublocation_ids[#{sublocation.name}]", sublocation.id, @user.sublocations.include?(sublocation) .actions = f.submit 'Save' </code></pre> <p>Then perhaps on the user show page, list all their sublocations and create a form for them to set a default.</p> <p><strong>users/show.html.haml</strong></p> <pre><code>= form_tag user_set_default_path(@user), method: :put do %table %tr %th Sublocation %th Default? - @affiliations.each do |affiliation| %tr %td= affiliation.sublocation.name %td= radio_button_tag :affiliation_id, affiliation.id, affiliation.default? ? {checked: true} : nil = submit_tag "Set default" </code></pre> <p><strong>routes.rb</strong></p> <pre><code>resources :users do member do put "set_default" end end </code></pre> <p>Hope this helps or at least gets you on the right path. </p>
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    1. COThis has got me well on my way. I'm wanting to set the default in the new user form since users shouldn't be able to set their own default sub location, but in the meantime, I'll redirect to the 'set default' form after the user is created. Many thanks.
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