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POTrouble checking the size of an uploading image file using Ruby on Rails 3
 

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  1. POTrouble checking the size of an uploading image file using Ruby on Rails 3
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    <p>I am using Ruby on Rails 3 and in my controller I'm just trying to check if the size of an uploading image is larger than a given value. </p> <p>I need this because I would like to prevent that the server, before saving the image file on the Hard disk, checks the uploading image so that the upload doesn't start if the image size is larger of a custom value: I would like prevent a sever <em>overloading</em>.</p> <p>I am trying to do that as follows:</p> <pre><code>if request.headers["CONTENT_LENGTH"] image_file_max_size ||= 16777216 @user.errors.add( :image, "is too big") if ( request.headers["CONTENT_LENGTH"].to_i &gt; image_file_max_size.to_i ) end # continue... (see UPDATES) </code></pre> <p>but it seems don't work. It seems to get the 'CONTENT_LENGTH' value only after that the upload is complete, not before.</p> <p>Why? What is wrong? Maybe the <code>request.headers["CONTENT_LENGTH"]</code> doesn't "intercept" the size of the uploading image?</p> <hr> <p><strong>UPDATE</strong> for <strong>@jamiew</strong> (<em>commenter</em>)</p> <p>My server setup is <em>Apache</em> + <em>Phusion Passenger</em>. I am also using <em>Paperclip</em> gem.</p> <p><strong>UPDATE</strong> for <strong>@Jeff Paquette</strong> (<em>commenter</em>)</p> <p>In my case I am running an <em>AJAX request</em> using this <a href="http://khamsouk.souvanlasy.com/articles/ajax-file-uploads-in-rails-using-attachment_fu-and-responds_to_parent" rel="nofollow">technique</a>.</p> <pre><code>#continue if @account.errors.empty? if @account.update_attributes(params[:users_account]) flash.now[:notice] = "Good!" else flash.now[:notice] = "Bad!" end format.html { render :action =&gt; 'edit' } format.js { responds_to_parent do render :action =&gt; 'update.js.rjs' end } end </code></pre>
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    1. PTQuestion
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    1. COWhat kind of output do you get from this? CONTENT_LENGTH worked historically. Also, what is your server setup (apache/nginx/passenger/unicorn etc)?
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      1. POTrouble checking the size of an uploading image file using Ruby on Rails 3
      1. USjamiew
    2. COWhat are you doing after the check of the size? All the code above does is set up a validation error. What steps have you taken to terminate the request?
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      1. POTrouble checking the size of an uploading image file using Ruby on Rails 3
      1. USJeff Paquette
    3. COI updated the question.
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      1. POTrouble checking the size of an uploading image file using Ruby on Rails 3
      1. USuser502052
 

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