我正在设置Django Web应用程序，并想使用call我的'move'对象来获取Artist模型中定义的移动艺术家。
如果我删除了引用HTML中的ForeignKey的变量，或者从我的models.py文件中的Move类中删除了该变量，我不会遇到任何错误。
这是我的models.py文件：
from django.db import models
class Move(models.Model):
move_artist = models.ForeignKey('Artist', on_delete=models.CASCADE, default=2)
class Artist(models.Model):
artist_move = models.ForeignKey(Move, on_delete=models.CASCADE, default=1)
这是我的html文件：
{% extends 'main/header.html' %}
{% block content %}
<body>
{% for mov in moves %}
<p>{{mov.move_artist}}</p>
{% endfor %}
</body>
{% endblock %}
这是我的views.py文件：
from .models import Move, Artist
from django.shortcuts import render
def cite(request):
return render(request, 'main/cite.html', {"moves": Move.objects.all()})
这是我收到的错误：
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 829, in _resolve_lookup
current = current[bit]
TypeError: 'Move' object is not subscriptable
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py", line 163, in __get__
rel_obj = self.field.get_cached_value(instance)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/fields/mixins.py", line 13, in get_cached_value
return instance._state.fields_cache[cache_name]
KeyError: 'move_artist'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/core/handlers/base.py", line 124, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/name/Documents/Coding/Python/site/site/main/views.py", line 58, in site
return render(request, 'main/site’, {"moves": Move.objects.all()})
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/shortcuts.py", line 36, in render
content = loader.render_to_string(template_name, context, request, using=using)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/loader.py", line 62, in render_to_string
return template.render(context, request)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/backends/django.py", line 61, in render
return self.template.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 171, in render
return self._render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 937, in render
bit = node.render_annotated(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 904, in render_annotated
return self.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/loader_tags.py", line 150, in render
return compiled_parent._render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 163, in _render
return self.nodelist.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 937, in render
bit = node.render_annotated(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 904, in render_annotated
return self.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/loader_tags.py", line 62, in render
result = block.nodelist.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 937, in render
bit = node.render_annotated(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 904, in render_annotated
return self.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/defaulttags.py", line 209, in render
nodelist.append(node.render_annotated(context))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 904, in render_annotated
return self.render(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 987, in render
output = self.filter_expression.resolve(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 671, in resolve
obj = self.var.resolve(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 796, in resolve
value = self._resolve_lookup(context)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/template/base.py", line 837, in _resolve_lookup
current = getattr(current, bit)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py", line 177, in __get__
rel_obj = self.get_object(instance)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/fields/related_descriptors.py", line 144, in get_object
return qs.get(self.field.get_reverse_related_filter(instance))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/query.py", line 390, in get
clone = self.filter(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/query.py", line 844, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/query.py", line 862, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1263, in add_q
clause, _ = self._add_q(q_object, self.used_aliases)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1281, in _add_q
current_negated, allow_joins, split_subq)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1287, in _add_q
split_subq=split_subq,
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1225, in build_filter
condition = self.build_lookup(lookups, col, value)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1096, in build_lookup
lookup = lookup_class(lhs, rhs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/lookups.py", line 20, in __init__
self.rhs = self.get_prep_lookup()
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/lookups.py", line 70, in get_prep_lookup
return self.lhs.output_field.get_prep_value(self.rhs)
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 965, in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: ''
我希望页面显示每个动作的艺术家，而不是抛出错误。谢谢
答案 0 :(得分：0)
尝试在上下文中设置查询，然后将上下文传递给模板：
# views.py
from .models import Move, Artist
from django.shortcuts import render
def cite(request):
context = {'moves': Move.objects.all()}
return render(request, 'main/cite.html', context)
，然后在您的模板中，相同的标记应具有所需的结果：
{% extends 'main/header.html' %}
{% block content %}
<body>
{% for mov in moves %}
<p>{{mov.move_artist}}</p>
{% endfor %}
</body>
{% endblock %}
我认为该错误是由于您将字典直接传递给模板而引起的，这就是为什么它出现TypeError的原因：“ Move”对象不可下标。希望这会有所帮助。
尝试：
from django.db import models
class Move(models.Model):
move_artist = models.ForeignKey('Artist', on_delete=models.CASCADE) # delete default
class Artist(models.Model):
artist_move = models.ForeignKey(Move, on_delete=models.CASCADE) # delete default
运行您的迁移，然后重试。 *您可能必须删除旧的迁移。