我正在研究一个Django应用程序，该应用程序从API获取JSON数据并将其存储在PostgreSQL数据库中。 但是在迁移应用程序时我遇到了这个错误：
ValueError: invalid literal for int() with base 10: ''
我应该在代码中更改哪些内容来解决此错误？ 这是追溯：
Traceback (most recent call last):
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
utility.execute()
File "/python/lib/python3.6/site-packages/django/core/management/__init__.py", line 355, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/python/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/python/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute
output = self.handle(*args, **options)
File "/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 204, in handle
fake_initial=fake_initial,
File "/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 115, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 145, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/python/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/python/lib/python3.6/site-packages/django/db/migrations/migration.py", line 129, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/python/lib/python3.6/site-packages/django/db/migrations/operations/fields.py", line 87, in database_forwards
field,
File "/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 415, in add_field
definition, params = self.column_sql(model, field, include_default=True)
File "/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 155, in column_sql
default_value = self.effective_default(field)
File "/python/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 229, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/python/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 770, in get_db_prep_save
prepared=False)
File "/python/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 762, in get_db_prep_value
value = self.get_prep_value(value)
File "/python/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 1853, in get_prep_value
return int(value)
ValueError: invalid literal for int() with base 10: ''
如何解决这个问题？
这是models.py的代码：
from django.db import models
from django.contrib.postgres.fields import JSONField
class Projects(models.Model):
data = JSONField(null=False)
project_id=models.CharField(max_length=100)
project_name=models.CharField(max_length=100)
status=models.CharField(max_length=10)
country=models.CharField(max_length=100)
locations=JSONField()
mjtheme=models.CharField(max_length=50)
project_docs=JSONField()
source=models.CharField(max_length=10)
mjtheme_namecode=models.CharField(max_length=10)
docty=models.TextField()
countryname=models.CharField(max_length=100)
countrycode=models.CharField(max_length=10)
themecode=models.IntegerField()
theme_namecode=models.IntegerField()
project_url=models.TextField()
totalcommamt=models.IntegerField()
mjthemecode=models.IntegerField()
sector1=models.CharField(max_length=10)
theme1=models.CharField(max_length=10)
theme2=models.CharField(max_length=10)
theme3=models.CharField(max_length=10)
projectinfo=models.TextField()
country_namecode=models.CharField(max_length=5)
p2a_updated_date=models.IntegerField()
p2a_flag=models.CharField(max_length=5)
project_abstract=JSONField()
这是fetch.py文件的代码，它存储在/management/commands/fetch.py下：
import requests
from django.core.management.base import BaseCommand
from worldBank.worldBankApp.models import Projects
class Command(BaseCommand):
def handle(self, **options):
response = requests.get("https://search.worldbank.org/api/v2/projects?format=json&countryshortname_exact=India&source=IBRD&kw=N&rows=7")
data = response.json()
projects = data['projects']
#print(data)
for project in projects:
print(projects[project])
print("\n\n")
data = projects[project]
Projects.objects.create(
project_id = data['id'],
project_name = data['project_name'],
status = data['status'],
country = data['countryshortname'],
locations = data['locations'],
mjtheme = data['mjtheme'],
project_docs = data['projectdocs'],
source = data['source'],
mjtheme_namecode = data['mjtheme_namecode'],
docty = data['docty'],
countryname = data['countryname'],
countrycode = data['countrycode'],
themecode = data['themecode'],
theme_namecode = data['theme_namecode'],
project_url = data['url'],
totalcommamt = data['totalcommamt'],
mjthemecode = data['mjthemecode'],
sector1 = data['sector1'],
theme1 = data['theme1'],
theme2 = data['theme2'],
theme3 = data['theme3'],
projectinfo = data['projectinfo'],
country_namecode = ['country_namecode'],
p2a_updated_date = data['p2a_updated_date'],
p2a_flag = data['p2a_flag'],
project_abstract = data['project_abstract']
)
答案 0 :(得分：1)
以下IntegerField中的任何一个都会出现错误。
themecode=models.IntegerField()
theme_namecode=models.IntegerField()
totalcommamt=models.IntegerField()
mjthemecode=models.IntegerField()
p2a_updated_date=models.IntegerField()
原因：你应该分配整数值（例如4或'4'）而不是它。请检查上述字段的值。
=====编辑
响应整数字段的值：
themecode: "79,77,66", # invalid
mjthemecode: "10,10,5", # invalid
p2a_updated_date: "2017-09-01 00:00:00.0", # invalid
theme_namecode: [] # invalid
====编辑：在data = projects[project]
for k, v in data.items():
try:
int(v)
except ValueError:
print k, v
break
答案 1 :(得分：0)
Navyad基本上是正确的，你试图将字符串分配给整数字段（themecode就是一个很好的例子）。
通过JSON，我看到"themecode": "79,77,66"之类的东西。这只是不能插入整数字段。您需要将这些更改为models.CharField或以某种方式预处理数据（例如，提取第一个数字）。