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Clarify when `enctype="multipart/form-data"` gets added to forms [docs] 

As noted in https://github.com/rails/rails/issues/41632 the docs for this are incorrect. The `enctype` attribute is automatically added anytime you make a form with a `file_field`.

Resolves https://github.com/rails/rails/issues/41632

Update actionview/lib/action_view/helpers/form_helper.rb

Co-authored-by: Petrik de Heus <petrik@deheus.net>
This commit is contained in:
Alex Ghiculescu 2021-03-09 16:52:55 -06:00
parent fc20050ea6
commit 0fba70c082
2 changed files with 4 additions and 4 deletions
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2
actionview/lib/action_view/helpers/form_helper.rb
View File

@ -2426,7 +2426,7 @@ module ActionView
# 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>.
# Using this method inside a +form_with+ block will set the enclosing form's encoding to <tt>multipart/form-data</tt>.
#
# ==== Options
# * Creates standard HTML attributes for the tag.

6
guides/source/form_helpers.md
View File

@ -644,7 +644,7 @@ Output:
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. File upload fields can be rendered with the [`file_field`](https://api.rubyonrails.org/classes/ActionView/Helpers/FormBuilder.html#method-i-file_field) helper. The most important thing to remember with file uploads is that the rendered form's `enctype` attribute **must** be set to "multipart/form-data". If you use `form_with` with `:model`, this is done automatically:
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. File upload fields can be rendered with the [`file_field`](https://api.rubyonrails.org/classes/ActionView/Helpers/FormBuilder.html#method-i-file_field) helper.
```erb
<%= form_with model: @person do |form| %>
@ -652,11 +652,11 @@ A common task is uploading some sort of file, whether it's a picture of a person
<% end %>
```
If you use `form_with` without `:model`, you must set it yourself:
The most important thing to remember with file uploads is that the rendered form's `enctype` attribute **must** be set to "multipart/form-data". This is done automatically if you use a `file_field` inside a `form_with`. You can also set the attribute manually:
```erb
<%= form_with url: "/uploads", multipart: true do |form| %>
<%= form.file_field :picture %>
<%= file_field_tag :picture %>
<% end %>
```