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Use Rails’ form_for but set custom classes, attributes on <form> element?

form_for seems to ignore any 'extra' attributes like a data-foo attribute or class passed as options in its second argument.

= form_for @user, {:url => 'foo', :class => 'x', 'data-bar' => 'baz' } do |f|
 # ...

The output is a <form> tag with no x class or data-bar attribute.

What’s the fix?

Or, how can I grab a FormBuilder instance without using form_for?

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  • 3
    Wow, really? those should be exactly equivalent. You can reproduce this? Which version of Ruby are you using? Commented Oct 29, 2014 at 4:01
  • @Alan H. Using Ruby 2.1.3p242 = form_for(:user, :url => login_path, html: {:class => 'login_form'}) do |f| %> This was the only way that my code would apply the class, otherwise it was just ignoring it. Commented Oct 30, 2014 at 0:07
  • Those two lines are exactly identical. Guessing you forgot to save in between? Commented Jan 29, 2015 at 14:05
  • I know, they should be. For me it just wasn't working though. Saving wasn't the issue. Commented Jan 30, 2015 at 3:50

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