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Follow up to #17973 [ci skip]

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Robin Dupret 2015-01-02 20:22:39 +01:00
parent c2d2a7d4cc
commit 843fc99786
1 changed files with 10 additions and 9 deletions
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19
actionview/lib/action_view/helpers/form_helper.rb
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@ -857,20 +857,21 @@ module ActionView
#
# ==== Gotcha
#
# The HTML specification says when nothing is select on a file field web browsers do not send any value to server.
# Unfortunately this introduces a gotcha:
# if an +User+ model has a +avatar+ field, and in the form none file is selected no +avatar+ parameter is sent. So,
# any mass-assignment idiom like
# The HTML specification says that when a file field is empty, web browsers
# do not send any value to the server. Unfortunately this introduces a
# gotcha: if a +User+ model has an +avatar+ field, and no file is selected,
# then the +avatar+ parameter is empty. Thus, any mass-assignment idiom like
#
# @user.update(params[:user])
#
# wouldn't update avatar.
# wouldn't update the +avatar+ field.
#
# To prevent this the helper generates an auxiliary hidden field before
# every file field. The hidden field has the same name as file field and blank value.
# To prevent this, the helper generates an auxiliary hidden field before
# every file field. The hidden field has the same name as the file one and
# a blank value.
#
# In case if you don't want the helper to generate this hidden field you can specify
# <tt>include_hidden: false</tt> option.
# In case you don't want the helper to generate this hidden field you can
# specify the <tt>include_hidden: false</tt> option.
def file_field(object_name, method, options = {})
Tags::FileField.new(object_name, method, self, options).render
end