[web2py] How to work with files in multipart/form-data?

[Константин Комков]

In view I use JS code, which allow using one button for opening Dialog 
and choosing any files. Then I send its in controller like 
multipart/form-data.
<button id="btnTwo" class="col-sm-12 col-lg-4 good-btn" style="margin-bottom
: 10px;"><div class="my-btn-conteiner"><span class="glyphicon 
glyphicon-paperclip"></span><p class="p-btn">Прикрепить</p>
<input type="file" id="openDialog" multiple="multiple" style="display:none"
/>
<script>
    $(function() {
        var files;
        function showLoadDocsInfo(data) {
            console.log('In showLoadDocsInfo');
            console.log(data);
        }
        $('#openDialog').on('change', function () {
            files = this.files;
            console.log('files = '+files);
            if (typeof files == 'undefined' ) return;
            var data = new FormData();
            $.each( files, function( key, value ) {
                data.append( key, value );
            });
            console.log('data = '+data);
            jQuery.ajax({
                type: "POST",
                url: "loadDocs",
                data: 'data='+JSON.stringify(data),
                cache: false,
                processData: false,
                contentType: false,
                success: showLoadDocsInfo
            });
        });
        $('#btnOne,#btnTwo,#btnThree').on('click', function() {
            $('#openDialog').click();
        });
    });
</script>
My model:

db_app.define_table('doc_images',
                Field 
<http://192.168.20.184/examples/global/vars/Field>('person',label='ФИО',writable=False),
                Field 
<http://192.168.20.184/examples/global/vars/Field>('file', 
'upload',label='Документ', requires=[IS_UPLOAD_FILENAME 
<http://192.168.20.184/examples/global/vars/IS_UPLOAD_FILENAME>(extension='^(pdf|tiff|png|bmp|jpeg|jpg)$'),IS_LENGTH
 <http://192.168.20.184/examples/global/vars/IS_LENGTH>(10485760, 1024)]),
                format = '%(title)s')

What I should write in controller for adding files in db_app.doc_images?

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