Use array to implement checkbox in ruby on rails

Question

How can I make 10 or more than 10 check box by a for loop

This is my code

In view.html.erb

<% (0...100) do |i| %>
  <%= f.check_box :chkbox_ary[i], {:checked=>false, :style => "width: 20px; height: 20px;"} %>
  <%= f.label "checkbox" %>
<% end %>

And in model

attr_accessor :chkbox_ary

def initialize(attributes = {})
  @chkbox_ary = []
end

I think this is OK, but I always get error

Internal Server Error
expected Array (got Rack::Utils::KeySpaceConstrainedParams) for param `travel'

How can I do to get my purpose or have some reference for me? Thanks

Thilo · Accepted Answer · 2014-08-10 09:24:41Z

1

Your loop is missing an iterator:

(0...100).each do |i|

And you cannot use an index on a symbol - use the name of the array, and interpolate the index variable:

f.check_box "chkbox_ary[#{i}]" #...

answered Aug 10, 2014 at 9:24

Thilo

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3 Comments

徐啟倫 Over a year ago

Thanks for your reply and correction. But how can I communicate with my attr_accessor in model. "chkbox_ary[#{i}]" seem not means :chkbox_ary Thanks

Thilo Over a year ago

Your checkbox array is not part of an object, so you can't access it using the object referenced by your form helper f. Use this version instead, passing the tag name and value separately: check_box_tag "chkbox_ary[#{i}]", @ckbox_ary[i], ...

徐啟倫 Over a year ago

I'm so sorry, I still can't solve my problem. When I use :ckbox_ary[0], it will show 'c'. This is website I make. taxifong.com/travel/travel. I only want to use a attr_accessor to record checkbox value, and I will use notifier to send the mail. <% if @sender.chkbox_ary[0] == "1" %> <%= test %> <BR><% end %> My previous method is use many attr_accessor, but I think this is not good

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