Check_box submits both "1" and "0" when checked

Hi, I have a “Customer” model and a “Product” model, where a Customer
“has many” Products. When editing a Customer, I also want to display the
Products that person has at the bottom of the page, available for
editing, (“complex forms” as described in Railscast 73, 74, and 75).

at the end of Customer’s edit.html.erb:

<%= render :partial => ‘product’, :collection => @customer.products,
:locals => { :f => f } %>

in _product.html.erb:
<% fields_for “customer[product_attributes][]”, product do
|product_form| %>

Serial Number
<%= product_form.text_field :serial_number, :index => nil

<%= product_form.check_box :payment_received, :index => nil

Overall, this scheme is working fine, and I can edit any of the Products
from the Customer page and update them with no problem. The only
problem comes when I try to edit the “Payment Received” check box…it
appears to be submitting “1” and “0” when I check the box and update it.
As a result, a Customer who originally had 3 Products will, after
checking the “Payment Received” check box in some of them, have 5 (or 6
or 7) Products afterwards.

The (messed up) params sent to the Update after checking the boxes are
as follows:
(rdb:27) params[:customer][:product_attributes][0]
{“remarks”=>“remark1.”, “product_id”=>“72”, “company_id”=>“1”,
1", “serial_number”=>“4444”}
(rdb:27) params[:customer][:product_attributes][1]
{“payment_received”=>“1”, “subscription”=>“0”}
(rdb:27) params[:customer][:product_attributes][2]
{“remarks”=>"", “product_id”=>“73”, “payment_received”=>“0”, “id”=>“22”,
“subscription”=>“1”, “broadcast_period(1i)”=>“2008”,
, “serial_number”=>“55555”, “broadcast_period(3i)”=>“31”}
(rdb:27) params[:customer][:product_attributes][3]
{“payment_received”=>“1”, “subscription”=>“0”}
(rdb:27) params[:customer][:product_attributes][4]
{“remarks”=>“remark3.”, “product_id”=>“73”, “payment_received”=>“0”,
“id”=>“23”, "company_id
"=>“4”, “subscription”=>“1”, “broadcast_period(1i)”=>“2008”,
i)”=>“3”, “serial_number”=>“3333”, “broadcast_period(3i)”=>“31”}
(rdb:27) params[:customer][:product_attributes][5]
{“payment_received”=>“1”, “subscription”=>“0”}
(rdb:27) params[:customer][:product_attributes][6]
{“payment_received”=>“0”, “id”=>“24”,
=>“3”, “broadcast_period(3i)”=>“31”}

Sorry its a little hard to read, but there should only be 3 Products
with this Customer, but there is now 7. The “payment_received” (and
“subscription”) params were checked, and should be “1” but they both
alternate between “1” and “0”, creating extra Products.

Any idea what is causing this? Everything else (text_field, text_area,
select, date_select) all work fine, and my form check_boxes work fine
elsewhere. The Generated HTML appears to be fine for my check boxes,
looks the same as the others… Is it because I’m updating a model
within a model?

Any insight would be greatly appreciated, thank you.

On 26 Mar 2008, at 03:03, Brent S. wrote:

looks the same as the others… Is it because I’m updating a model
within a model?

I’m not entirely sure what is going on, but this bit of information
might be helpful. By default if you have just a checkbox and it’s not
checked then the browser submits absolutely nothing. Things would be
somewhat simpler if it sent false and true in the other case (or 0 and
1 or whatever).
To get around this when you use check_box (but not check_box_tag)
rails creates a hidden input in addition to the checkbox, the input
input is wired up to send 0 and the checkbox will send nothing or 1.
It’s also true that parameter names are very significant to rails: if
you have 2 inputs called bob, then the first one wins (this is what
should happen with the checkboxes). However if you have 2 inputs
called bob[] then you’ll get an array called bob in your params.
I suspect something to do with these 2 things is happening.


Thanks a lot, that looks like it’s probably the case in this
situation… I’ll check it out.


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