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Editorial Team
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Asked: 2026-05-25T20:19:00+00:00

I am using Ruby on Rails 3 and I have a form like this:

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I am using Ruby on Rails 3 and I have a form like this:

<%= form_for(@user, ... ) do |f| %>
  ...
  <%= f.file_field :avatar, :id => "test_id", :style => "display: block", :size => "13" %>
  ...
<% end %>

When I go to see the source of the page, this is the HTML code generated:

<input type="file" style="display: block;" name="user[avatar]" id="test_id">

that means the ‘size’ attribute there isn’t.

I tried on Firefox, Chrome and Safari: same output, but it seems to have everything set correctly.

Is it a problem related to RoR3?

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1 Answer

  1. Editorial Team

    I actually found that the size attribute is intentionally left out of the Rails source code here:

    https://github.com/rails/rails/blob/75366cb82dc6fa4b3dada2a450dda18496f3eddd/actionpack/lib/action_view/helpers/form_helper.rb#L734

    “to_input_field_tag(“file”, options.update({:size => nil})”

    Don’t know why but glad to hear you found a workaround.

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