I found solution but very inefficient one:
{% with gallery.get_pictureingallery_order as
ids_in_order %}
{% for picture_in_gallery_id in ids_in_order %}
{% for picture_in_gallery in
gallery.pictureingallery_set.select_related %}
{% ifequal picture_in_gallery_id
picture_in_gallery.id %}
<div class="photo">
{% spaceless %}
<img
src="{{picture_in_gallery.picture.image.url}}" />
<br />
{% endspaceless %}
<p class="subtitles">
{% for subtitle_id in
picture_in_gallery.get_picturesubtitle_order %}
{% for subtitle in
picture_in_gallery.picturesubtitle_set.select_related %}
{% ifequal subtitle_id subtitle.id %}
{{subtitle}}<br />
{% endifequal %}
{% endfor %}
{% endfor %}
</p>
</div>
{% endifequal %}
{% endfor %}
{% endfor %}
{% endwith %}
This code makes rendering the template hit database many times.
And things get worse when I have 1-to-many relation nested thrice. Is
there better solution?
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