diff options
| -rw-r--r-- | actionpack/lib/action_view/helpers/form_helper.rb | 4 | ||||
| -rw-r--r-- | railties/guides/source/form_helpers.textile | 6 |
2 files changed, 7 insertions, 3 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb index 700a5a0ef1..3cc412de63 100644 --- a/actionpack/lib/action_view/helpers/form_helper.rb +++ b/actionpack/lib/action_view/helpers/form_helper.rb @@ -668,11 +668,13 @@ module ActionView InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("hidden", options) end - # Returns an file upload input tag tailored for accessing a specified attribute (identified by +method+) on an object + # Returns a file upload input tag tailored for accessing a specified attribute (identified by +method+) on an object # assigned to the template (identified by +object+). Additional options on the input tag can be passed as a # hash with +options+. These options will be tagged onto the HTML as an HTML element attribute as in the example # shown. # + # Using this method inside a +form_for+ block will set the enclosing form's encoding to <tt>multipart/form-data</tt>. + # # ==== Examples # file_field(:user, :avatar) # # => <input type="file" id="user_avatar" name="user[avatar]" /> diff --git a/railties/guides/source/form_helpers.textile b/railties/guides/source/form_helpers.textile index 26cbdfc44f..e3b9d745b2 100644 --- a/railties/guides/source/form_helpers.textile +++ b/railties/guides/source/form_helpers.textile @@ -549,7 +549,7 @@ will produce the same output if the current year is 2009 and the value chosen by h3. Uploading Files -A common task is uploading some sort of file, whether it's a picture of a person or a CSV file containing data to process. The most important thing to remember with file uploads is that the form's encoding *MUST* be set to "multipart/form-data". If you forget to do this the file will not be uploaded. This can be done by passing +:multi_part => true+ as an HTML option. This means that in the case of +form_tag+ it must be passed in the second options hash and in the case of +form_for+ inside the +:html+ hash. +A common task is uploading some sort of file, whether it's a picture of a person or a CSV file containing data to process. The most important thing to remember with file uploads is that the rendered form's encoding *MUST* be set to "multipart/form-data". If you use +form_for+, this is done automatically. If you use +form_tag+, you must set it yourself, as per the following example. The following two forms both upload a file. @@ -558,11 +558,13 @@ The following two forms both upload a file. <%= file_field_tag 'picture' %> <% end %> -<%= form_for @person, :html => {:multipart => true} do |f| %> +<%= form_for @person do |f| %> <%= f.file_field :picture %> <% end %> </erb> +NOTE: Since Rails 3.1, forms rendered using +form_for+ have their encoding set to <tt>multipart/form-data</tt> automatically once a +file_field+ is used inside the block. Previous versions required you to set this explicitly. + Rails provides the usual pair of helpers: the barebones +file_field_tag+ and the model oriented +file_field+. The only difference with other helpers is that you cannot set a default value for file inputs as this would have no meaning. As you would expect in the first case the uploaded file is in +params[:picture]+ and in the second case in +params[:person][:picture]+. h4. What Gets Uploaded |