我正在尝试设置迁移文件以将值加载到我的表中。我正在我的表格中创建国家/州。我想以一种可以将每个国家/地区放入自己的文件中的方式进行设置，然后遍历所有移民国家/地区。我成功地分别输入了所有的名字，但我正在努力让它变得更容易。
UPDATE:
感谢您的帮助，我让一切都按照我想要的方式工作。这是我的最终结果。
models:
class Country(models.Model):
country_code = models.CharField(
primary_key=True,
max_length=3,
verbose_name='Country Code',
help_text='3 Letter Country Code',
)
country_name = models.CharField(
"Country Name",
max_length=30,
unique=True,
)
class State(models.Model):
key = models.AutoField(
primary_key=True,
)
country = models.ForeignKey(
'Country',
on_delete=models.CASCADE,
verbose_name='Country',
help_text='State located in:'
)
state_name = models.CharField(
"State or Province",
max_length=100,
)
state_code = models.CharField(
"State Code",
max_length=30,
help_text='Mailing abbreviation'
)
迁移数据文件：
"""
Canada migration information.
Stored in dictionary = canada
copy into migration_data_migrate_countries
from .migration_country_Canada import canada
Models:
Country
State
"""
# Country
import_country = ['CAN', 'CANADA',]
# State
import_states = [
['AB', 'ALBERTA'],
['BC', 'BRITISH COLUMBIA'],
['MB', 'MANITOBA'],
etc...
]
# 'import' into migration file
canada = {
'country': import_country,
'states': import_states,
}
第二个国家文件：
# Country
import_country = ['USA', 'UNITED STATES',]
# State
import_states = [
['AL', 'ALABAMA'],
['AK', 'ALASKA'],
['AZ', 'ARIZONA'],
etc...
]
# 'import' into migration file
united_states = {
'country': import_country,
'states': import_states,
}
导入方法：
# Keep imports alphabetized by country name.
from .migration_country_Canada import canada
from .migration_country_UnitedStates import united_states
list_of_countries = [
canada,
united_states,
]
def migrate_countries(apps, schema_editor):
Country = apps.get_model('app', 'Country')
State = apps.get_model('app', 'State')
for country in list_of_countries:
import_country = country['country']
states = country['states']
current_country = Country.objects.get_or_create(
country_code=import_country[0],
country_name=import_country[1]
)
# False = already exists. True = created object.
print(import_country, current_country)
for s in states:
state_country = Country.objects.get(
country_code=import_country[0])
state = State.objects.get_or_create(
country=state_country,
state_code=s[0],
state_name=s[1],
)
# False = already exists. True = created object.
print(s, state)
然后我跑python3 manage.py makemigrations --empty app并编辑迁移文件：
from django.db import migrations
from app.migration_countries.migration_data_migrate_countries import *
class Migration(migrations.Migration):
dependencies = [
('app', '0001_initial'),
]
operations = [
migrations.RunPython(migrate_countries),
]
然后运行python3 manage.py migrate并在终端中得到结果
... # Added Canada first which is why YUKON is False
['YT', 'YUKON'] (<State: State object (75)>, False)
['USA', 'UNITED STATES'] (<Country: Country object (USA)>, True)
['AL', 'ALABAMA'] (<State: State object (76)>, True)
...
当我想添加另一个国家时，france，我做了一个france文件并更改我的list to:
list_of_countries = [
canada,
france,
united_states,
]
我所做的任何更改都应该保持最新。希望。如有任何建议，请随时告诉我。
