diff options
Diffstat (limited to 'actionpack/lib/action_view')
| -rw-r--r-- | actionpack/lib/action_view/helpers/form_helper.rb | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb index 93b8ae687f..4e1927a897 100644 --- a/actionpack/lib/action_view/helpers/form_helper.rb +++ b/actionpack/lib/action_view/helpers/form_helper.rb @@ -628,7 +628,7 @@ module ActionView # # The HTML specification says unchecked check boxes are not successful, and # thus web browsers do not send them. Unfortunately this introduces a gotcha: - # if an Invoice model has a +paid+ flag, and in the form that edits a paid + # if an +Invoice+ model has a +paid+ flag, and in the form that edits a paid # invoice the user unchecks its check box, no +paid+ parameter is sent. So, # any mass-assignment idiom like # @@ -636,12 +636,15 @@ module ActionView # # wouldn't update the flag. # - # To prevent this the helper generates a hidden field with the same name as - # the checkbox after the very check box. So, the client either sends only the - # hidden field (representing the check box is unchecked), or both fields. - # Since the HTML specification says key/value pairs have to be sent in the - # same order they appear in the form and Rails parameters extraction always - # gets the first occurrence of any given key, that works in ordinary forms. + # To prevent this the helper generates an auxiliary hidden field before + # the very check box. The hidden field has the same name and its + # attributes mimick an unchecked check box. + # + # This way, the client either sends only the hidden field (representing + # the check box is unchecked), or both fields. Since the HTML specification + # says key/value pairs have to be sent in the same order they appear in the + # form, and parameters extraction gets the last occurrence of any repeated + # key in the query string, that works for ordinary forms. # # Unfortunately that workaround does not work when the check box goes # within an array-like parameter, as in |