Django / Python:如何遍历字典中的列表以进行迁移/迁移数据 [英] Django/Python: How to iterate through a list in a dictionary for migration/migrate data
问题描述
我正在尝试设置迁移文件以将值加载到我的表中。我在我的桌子上创建国家/州。我想以一种方式设置它,我可以将每个国家放在自己的文件中,然后在迁移的所有国家/地区运行。我成功地分别获得了所有的名字,但我想让它变得更容易。
I’m trying to set up migration files to load values into my tables. I am creating countries/states in my tables. I would like to set it up in a way that I can put each country in its own file, and then run through all the countries on migration. I successfully got all the names in separately, but I’m trying to make it easier.
更新:
感谢您的帮助,我完全按照我想要的方式工作。这是我的最终结果。
Thanks for help, I got it all to work the way I want it to. Here is my end result.
模特:
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/地区档案:
Second country file:
# 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)
然后我运行 python3 manage .py makemigrations --empty app
并编辑迁移文件:
Then I run python3 manage.py makemigrations --empty app
and edit the migration file:
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
并在终端中获得结果
Then run python3 manage.py migrate
and get results in the terminal
... # 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 france
时,我赚了一个 france
文件并将我的列表
更改为:
And when I want to add another country, france
, I make a france
file and change my list
to:
list_of_countries = [
canada,
france,
united_states,
]
我所做的任何更改都应保持最新。希望。任何建议,请随时告诉我。
And any changes I make should stay up to date. Hopefully. Any suggestions, feel free to let me know.
推荐答案
我想你最初尝试接近这个任务的方式就是问题。我想你应该更新你的字典:
I guess the problem the way you initially are trying to approach this task. I think you should update your dictionary:
canada = {
'country': import_country,
'states': import_states,
}
请记住,键应该是不可变对象列表_of_countries中的国家/地区
Keep in mind that a key should be an immutable object.
for country in list_of_countries:
import_country = country['country']
states = country['states']
current_country = Country.objects.get_or_create(
country_code=c[0],
country_name=c[1]
)
current_country.states = states
我不确定你想要达到的目标,但如果你提供了更好的描述我可以更新我的答案。
I am not sure what you are trying to achieve, but if you provide a better description I can update my answer.
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