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-rw-r--r--actionpack/lib/action_view/helpers/form_helper.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index ec89da71a1..36cfb7fca7 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -433,7 +433,7 @@ module ActionView
builder = instantiate_builder(object_name, object, options)
output = capture(builder, &block)
- html_options[:multipart] = builder.multipart?
+ html_options[:multipart] ||= builder.multipart?
form_tag(options[:url] || {}, html_options) { output }
end