擅长:python、mysql、java
<p><code>A</code>类具有<code>b_set</code>属性,该属性返回相关的<code>B</code>对象。你知道吗</p>
<p>可以在模板中使用此属性:</p>
<pre><code>{% for a in alla %}
{{ a }}
{% for b in a.b_set.all %}
{{ b }}
{% endfor %}
{% endfor %}
</code></pre>
<p>引用一位伟人的话:</p>
<blockquote>
<p>When you define a relationship in a model (i.e., a ForeignKey,
OneToOneField, or ManyToManyField), instances of that model will have
a convenient API to access the related object(s).</p>
<p>[...]</p>
<p>Django also creates API accessors for the “other” side of the
relationship – the link from the related model to the model that
defines the relationship. For example, a <code>Blog</code> object b has access to a
list of all related <code>Entry</code> objects via the <code>entry_set</code> attribute:
<strong>b.entry_set.all()</strong>.</p>
</blockquote>