using $(this) with coffee script

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I am using query file upload. I have several forms on the page, each identical except for a hidden field called 'project'. Here is the coffee script that handles the upload:

jQuery ->
  $(document).ajaxComplete ->
    $('.project_file').fileupload
      dataType: "script"
      url: ($(this).prev('form').attr("action"))
      paramName: 'file_yo'
      formData: (form) -> 
        [{ name: 'authenticity_token',  value: $('meta[name="csrf-token"]').attr('content')}, { name: 'project',value: $(this).prev().val()}]
      alert($(this).prev().val())
      done: (e, data) ->
        $('#finish-text').html "Upload finished"

Here is the html for one of the forms. The only thing that changes from from to form is the value of the hidden field called 'project'.

<form accept-charset="UTF-8" action="/projects/6/project_files" class="edit_project" data-remote="true" id="project_file_form" method="post"><div style="margin:0;padding:0;display:inline">        <input name="utf8" type="hidden" value="✓"><input name="_method" type="hidden" value="patch"><input name="authenticity_token" type="hidden" value="iIQXYRJfXRFAaSsvSpb4H+HEUMeAI3pubXDRyd+2Ehk="></div>
    <input id="project" name="project" type="hidden" value="6">
    <input authenticity_token="true" class="field file-field project_file" id="" name="file_yo" title="" type="file" value="">  
</form>

The problem is that $(this) is undefined. When the alert shows up, it says undefined. How do I get $(this) to return the specific element with class 'project_file' as it should?

asked 52 secs ago

Philip7899

732