rails + carrierwave file uploading form arbitrary file fields count

I need to have from 1 to 15 file fields for photos.

Now I'm uploading files with carrierwave gem building every photo object in my controller like: N.times { @car.photos.build } and then provide N file fields for photos in my view.

But N is static value as you can understand.

How can I generate dynamic count of file fields, like:开发者_如何转开发 1 static from start and add 1 more on every user's ajax request (like user will be clicking Add photo field link) and dynamically create photo object for it @car.photo.build?

BTW, sorry for my english. Thanks.

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You must use javascript to generate dynamic fields. Something like this, using jquery:

var photos_count;
jQuery(function() {
  photos_count = $('#photos_fields > field').size();
  $('#add_photo').each(function() {
    this.onclick = function(event) {
      $("#photos_fields").append("<div class='field'><label>Photo</label><input name='car[photos_attributes][" + photos_count + "][image]' type='file'/></div>");
      photos_count++;
    };
  });
});

You can define additional action to ajax creating photos objects, but you can`t build it.

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Disclaimer: I'm the author of the post.

See multiple files upload with carrierwave and nested_form. It should help.