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You have only passed citizen
into the context (you haven’t passed passport
in the context). To access the related Passport
of the citizen you can write citizen.sID
(the name of your OneToOneField
), hence in your template you can write:
<h2>Passport:</h2>
<ul>
<li>Loại hộ chiếu: {{ citizen.sID.pType }} </li>
<li>Số hộ chiếu: {{ citizen.sID.Number }}</li>
<li>Thời hạn hiệu lực: {{ citizen.sID.validTime }}</li>
</ul>
Source:stackexchange.com