Rails5 Select checkboxes form

Question

I want my user to select out of a pre-filtered list of model instances.

Let's say @pages is an ActiveRecord Relationship of multiple pages.

Then in my view I want to display a form where the user can select them:

[X] Page One
[ ] Page Two
[ ] Page Three

And in my next controller action to be the params something like

selection => [12345 => true, 23456 => false, 56788 => false]

Where the numbers are the ids. Or even better the instances themselves.

The only thing I can figure out is

<%= form_with url: validate_pages_path do |form| %>
  <% Page.all.each do |page| %>
    <%= check_box_tag page.id %>
    <%= label_tag page.name %>
  <% end %>
  <%= form.submit %>
<% end %>

But then I end up with a params mess like

 {"utf8"=>"✓", "authenticity_token"=>"...", "992936610"=>"1", "992936644"=>"1", "commit"=>"Save "}

I don't have a model that nests pages that is definitely making it quite tricky

Answer 1

As I suggested in my comment, here the code in your case:

<%= form_with url: validate_pages_path do |form| %>
  <% Page.all.each do |page| %>
    # new stuff below
    <%= hidden_field_tag "pages[#{page.id}]", false %>
    <%= check_box_tag "pages[#{page.id}]", true %>
    # /new stuff above
    <%= label_tag page.name %>
  <% end %>
  <%= form.submit %>
<% end %>

As you can see, we used the name "pages[page.id]", so you should end up having params[:pages] which wraps the whole thing.