我正在尝试使用django中的fixture来使用初始值填充postgresql数据库。即使我的模型看起来像这样，我仍然会收到这些奇怪的Could not load publication.Article(pk=None): value too long for type character varying(100)
错误：
class Article(models.Model):
_id = models.CharField(max_length=1000)
author_name = models.CharField(max_length=1000)
caption = models.CharField(max_length=1000)
isGraphic = models.BooleanField(max_length=1000, default=True)
pictures = models.URLField(max_length=1000)
text = models.CharField(max_length=10000)
title = models.CharField(max_length=1000)
user_img = models.URLField(max_length=1000)
videoname = models.CharField(max_length=1000)
vimeo_id = models.IntegerField(max_length=1000)
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
utility.execute()
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **options.__dict__)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/base.py", line 338, in execute
output = self.handle(*args, **options)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 61, in handle
self.loaddata(fixture_labels)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 91, in loaddata
self.load_label(fixture_label)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 148, in load_label
obj.save(using=self.using)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/core/serializers/base.py", line 173, in save
models.Model.save_base(self.object, using=using, raw=True)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/base.py", line 617, in save_base
updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/base.py", line 698, in _save_table
result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/base.py", line 731, in _do_insert
using=using, raw=raw)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/manager.py", line 92, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/query.py", line 921, in _insert
return query.get_compiler(using=using).execute_sql(return_id)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 920, in execute_sql
cursor.execute(sql, params)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/backends/utils.py", line 81, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/Users/sam.royston/PycharmProjects/sahelien_d/lib/python2.7/site-packages/django/db/backends/utils.py", line 65, in execute
return self.cursor.execute(sql, params)
django.db.utils.DataError: Problem installing fixture '/Users/sam.royston/PycharmProjects/sahelien_d/sahelien_django/fixtures/test.json' : Could not load publication.Article(pk=None): value too long for type character varying(100)
为什么我会收到此错误？
test.json：
[
{ "model" : "publication.Article" , "fields":
{
"_id" : "5306dfa9ed2379f03a000001" ,
"author_name" : "Sahélien Tombouctou",
"caption" : "Les n’ont fait aucune victime, ni de dégâts matériels",
"isGraphic" : false,
"pictures" : [],
"text" : "La ville de Tombouctou a reçu des tirs d'obus dans la nuit de dimanche. \n<br>\n<br>\nLes deux premiers obus sont tombés dans la localité de Kabara, à 10km de la cité des 333 saints. Le troisième obus est tombé sur la route de Goundam.\n<br>\n<br>\nLes tirs n’ont fait aucune victime, ni de dégâts matériels. Selon le lieutenant-colonel Seydou Koné, en poste à Tombouctou, l'armée malienne est mobilisée pour déterminer l'origine de cette attaque.",
"title" : "Tombouctou attaquée à la roquette",
"videoname" : "okok.mp4",
"vimeo_id" : "87246621"
}
}
]
答案 0 :(得分：0)
您的json夹具缺少主键。 Django automatically adds a primary key给你的模特;叫id。由于此键是必需的，您应该在灯具中提供它。
您发布的灯具没有此键，您应该添加它：
[
{ "model" : "publication.Article" , "fields":
{
"id": "1",
"_id" : "5306dfa9ed2379f03a000001" ,
"author_name" : "Sahélien Tombouctou",
"caption" : "Les n’ont fait aucune victime, ni de dégâts matériels",
"isGraphic" : false,
"pictures" : [],
"text" : "La ville de Tombouctou a reçu des tirs d'obus dans la nuit de dimanche. \n<br>\n<br>\nLes deux premiers obus sont tombés dans la localité de Kabara, à 10km de la cité des 333 saints. Le troisième obus est tombé sur la route de Goundam.\n<br>\n<br>\nLes tirs n’ont fait aucune victime, ni de dégâts matériels. Selon le lieutenant-colonel Seydou Koné, en poste à Tombouctou, l'armée malienne est mobilisée pour déterminer l'origine de cette attaque.",
"title" : "Tombouctou attaquée à la roquette",
"videoname" : "okok.mp4",
"vimeo_id" : "87246621"
}
}
]
您缺少夹具中模型所需的关键字段。您需要添加user_img，而pictures不能为空。
灯具需要传递模型的所有验证规则;并且因为根据您的模型需要所有字段，所以它们都需要在夹具中可用。
此外，对于不适用的整数，布尔和url字段，您有一个max_length参数。