Rails - Params missing when updating unchecked checkboxes (as nil values)

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I've a problem with some checkboxes in a form, in that when they're submitted unchecked, I get the error param is missing or the value is empty: user.

I can't see why it's doing this; in most cases, this problem arises from not having the blank boxes defined in a hidden field, which I've got.

It's worth noting, the checkboxes work perfectly when something is checked.

Here's the checkbox code (@user is the standard User.find(params[:id])):

       <%= form_for(@user) do |f| %>
          <h2>Add your dietary requirements:</h2>
          <div class="field">
                <% hidden_field_tag "user[dietary_requirement_ids][]", nil %> <!-- a lack of this field often seems to generate this problem -->
                <% DietaryRequirement.all.each do |dietary_requirement| %>
                  <%= check_box_tag "user[dietary_requirement_ids][]", dietary_requirement.id, @user.dietary_requirement_ids.include?(dietary_requirement.id), id: dom_id(dietary_requirement) %>
                  <%= label_tag dom_id(dietary_requirement), dietary_requirement.name %><br>
                <% end %>
              </div>
              <%= f.submit "Update your account", class: "btn btn-primary" %>
        <% end %>

When something is checked, the params correctly pass through like this:

Parameters: {"user"=>{"dietary_requirement_ids"=>["2"]}, "commit"=>"Update your account", "id"=>"2"}

Though when nothing is selected, they incorrectly submit as follows:

Parameters: {"commit"=>"Update your account", "id"=>"2"}

The frustrating thing is, these checkboxes have worked perfectly for me to date, and today began to throw the error - with no discernible changes that should have affected this.

I've had a little look and can't find a solution to my specific problem out there - any one able to help?!

Thanks all, Steve.

asked 1 min ago

SRack

46

Rails - Params missing when updating unchecked checkboxes (as nil values)