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    <p>I believe the error is here:</p> <pre><code>def __init__(self, *args, **kwargs): super(AutoTreeItemField, self).__init__(TreeItem, null=True) </code></pre> <p>You should pass through the other (unnamed) args:</p> <pre><code>def __init__(self, *args, **kwargs): if not args: args = [TreeItem] options = {'null': True} options.update(kwargs) super(AutoTreeItemField, self).__init__(*args, **options) </code></pre> <p><strong>Edit</strong></p> <p>I probably found something. In a normal FK, say it's declared as</p> <pre><code>other = models.ForeignKey(OtherClass) </code></pre> <p>the type of instance.other is OtherClass, not ForeignKey. OtherClass instances have a <code>_meta</code> attribute, because they <strong>are</strong> models.</p> <p>In your case it seems (from the <code>django.core.serializers.python</code> traceback) that it is trying to serialize the AutoTreeItemField instance (that is of course not serializable) instead of the related TreeItem.</p> <p>From the <code>django.core.serializers.python</code> module, l. 48:</p> <pre><code>def handle_fk_field(self, obj, field): related = getattr(obj, field.name) </code></pre> <p>and you have in the contribute_to_class method:</p> <pre><code>setattr(cls, self.name, self) </code></pre> <p>while in the ForeignKey contribute_to_class method:</p> <pre><code>setattr(cls, self.name, ReverseSingleRelatedObjectDescriptor(self)) </code></pre> <p>Given that a ForeignKey instance is not a RelatedObjectDescriptor instance, all django serializers expect to find the latter, that are instances (or return instances upon being called their <code>__get__</code> method) of actual models.</p> <p>In the end, you'd probably remove the setattr(cls...) line from the method. </p>
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    1. POA custom field inheriting from ForeignKey throws an exception on save
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    1. COTrue, but that still doesn't help
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    2. CORemoving it causes other exceptions to arise.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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