'default': {},
'portaldb': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'med_portal',
'OPTIONS': {
'init_command': "SET sql_mode='STRICT_TRANS_TABLES'"
},
'USER': '****',
'PASSWORD': '',
'HOST': '***.***.**.*',
'PORT': '****',
},
'smgpr': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'supplies',
'OPTIONS': {
'init_command': "SET sql_mode='STRICT_TRANS_TABLES'"
},
'USER': '****',
'PASSWORD': '',
'HOST': '***.***.
**.*',
'PORT': '****',
},
#LocalRouter.py
class DBLocalRouter(object):
def db_for_read(self, model, **hints):
app_list = ('auth', 'admin', 'contenttypes', 'sessions', 'messages', 'staticfiles', 'Test', 'Admin', 'Charges', 'Products', 'Patients', 'Relationships', 'apis', 'corsheaders', 'djoser', 'django_filters', 'users', 'rest_framework', 'debug_toolbar')
if model._meta.app_label in app_list:
return 'smgpr'
return None
def db_for_write(self, model, **hints):
app_list = ('auth', 'admin', 'contenttypes', 'sessions', 'messages', 'staticfiles', 'Test', 'Admin', 'Charges', 'Products', 'Patients', 'Relationships', 'apis', 'corsheaders', 'djoser', 'django_filters', 'users', 'rest_framework', 'debug_toolbar')
if model._meta.app_label in app_list:
return 'smgpr'
return None
def allow_relation(self, obj1, obj2, **hints):
app_list = ('auth', 'admin', 'contenttypes', 'sessions', 'messages', 'staticfiles', 'Test', 'Admin', 'Charges', 'Products', 'Patients', 'Relationships', 'apis', 'corsheaders', 'djoser', 'django_filters', 'users', 'rest_framework', 'debug_toolbar')
if obj1._meta.app_label in app_list and obj2._meta.app_label in app_list:
return True
return None
def allow_migrate(self, db, app_label, model=None, **hints):
app_list = ('auth', 'admin', 'contenttypes', 'sessions', 'messages', 'staticfiles', 'Test', 'Admin', 'Charges', 'Products', 'Patients', 'Relationships', 'apis', 'corsheaders', 'djoser', 'django_filters', 'users', 'rest_framework', 'debug_toolbar')
if app_label in app_list:
return db == 'smgpr'
return None
#GlobalRouter.py
class DBGlobalRouter(object):
def db_for_read(self, model, **hints):
"""
Attempts to read portal models go to portal.
"""
app_list = ('portal', 'Test',)
if model._meta.app_label in app_list:
return 'portaldb'
return None
def db_for_write(self, model, **hints):
app_list = ('portal', 'Test',)
if model._meta.app_label in app_list:
return 'portaldb'
return None
def allow_relation(self, obj1, obj2, **hints):
app_list = ('portal', 'Test',)
if obj1._meta.app_label in app_list and obj2._meta.app_label in app_list:
return True
return True
def allow_migrate(self, db, app_label, model=None, **hints):
app_list = ('portal', 'Test',)
if app_label in app_list:
return db == 'portaldb'
return None
class User(AbstractBaseUser):
username = models.CharField(max_length=255, unique=True)
email = models.EmailField(max_length=255, unique=True)
full_name = models.CharField(max_length=255, blank=True, null=True)
custparent = models.ManyToManyField('portal.Custparent', related_name='facility', through='Relation')
active = models.BooleanField(default=True)
staff = models.BooleanField(default=False)
admin = models.BooleanField(default=False)
jwt_secret = models.UUIDField(default=uuid.uuid4)
created_at = models.DateTimeField(auto_now_add=True)
class Relation(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.DO_NOTHING)
custparent = models.ForeignKey('portal.Custparent', related_name='profile', on_delete=models.DO_NOTHING)
class Meta:
db_table= 'relation'
unique_together = ('user', 'custparent')
pbd_name = settings.DATABASES['portaldb']['NAME']
class Custparent(models.Model):
custparent_id = models.BigAutoField(primary_key=True)
name = models.CharField(max_length=255, blank=True, null=True)
comm_queue = models.CharField(max_length=128, blank=True, null=True)
email = models.CharField(db_column='EMail', max_length=255, blank=True, null=True) # Field name made lowercase.
invoice_email = models.CharField(db_column='Invoice_EMail', max_length=128, blank=True, null=True) # Field name made lowercase.
portal_id = models.IntegerField(blank=True, null=True)
sentupdate = models.DateTimeField(db_column='SentUpdate', blank=True, null=True) # Field name made lowercase.
webaddress = models.CharField(max_length=255, blank=True, null=True)
webext = models.CharField(max_length=3, blank=True, null=True)
passcode = models.CharField(db_column='PassCode', max_length=128, blank=True, null=True) # Field name made lowercase.
autoapprove = models.IntegerField(db_column='AutoApprove', blank=True, null=True) # Field name made lowercase.
testaccount = models.IntegerField(db_column='TestAccount', blank=True, null=True) # Field name made lowercase.
privateemail = models.IntegerField(db_column='PrivateEmail', blank=True, null=True) # Field name made lowercase.
forcemanponum = models.IntegerField(db_column='ForceManPONum', blank=True, null=True) # Field name made lowercase.
procuretopay = models.IntegerField(db_column='ProcureToPay', blank=True, null=True) # Field name made lowercase.
medassets_member = models.IntegerField(db_column='MedAssets_Member', blank=True, null=True) # Field name made lowercase.
medassets_facnum = models.IntegerField(db_column='MedAssets_FacNum', blank=True, null=True) # Field name made lowercase.
hideglorder = models.IntegerField(db_column='HideGLOrder', blank=True, null=True) # Field name made lowercase.
searchall = models.IntegerField(db_column='SearchAll', blank=True, null=True) # Field name made lowercase.
accountlabel = models.CharField(db_column='AccountLabel', max_length=50, blank=True, null=True) # Field name made lowercase.
inhouselabel = models.CharField(db_column='InHouseLabel', max_length=50, blank=True, null=True) # Field name made lowercase.
privatelabellogo = models.CharField(db_column='PrivateLabelLogo', max_length=120, blank=True, null=True) # Field name made lowercase.
hin = models.CharField(db_column='HIN', max_length=9, blank=True, null=True) # Field name made lowercase.
gln = models.CharField(db_column='GLN', max_length=13, blank=True, null=True) # Field name made lowercase.
shiptoattn = models.CharField(db_column='ShiptoAttn', max_length=64, blank=True, null=True) # Field name made lowercase.
shiptoaddress = models.CharField(db_column='ShiptoAddress', max_length=64, blank=True, null=True) # Field name made lowercase.
shiptocity = models.CharField(db_column='ShiptoCity', max_length=64, blank=True, null=True) # Field name made lowercase.
shiptostateprov = models.CharField(db_column='ShiptoStateProv', max_length=24, blank=True, null=True) # Field name made lowercase.
shiptopostalcode = models.CharField(db_column='ShiptoPostalCode', max_length=24, blank=True, null=True) # Field name made lowercase.
shiptophone = models.CharField(db_column='ShiptoPhone', max_length=24, blank=True, null=True) # Field name made lowercase.
shiptofax = models.CharField(db_column='ShiptoFax', max_length=24, blank=True, null=True) # Field name made lowercase.
multivendor = models.IntegerField(db_column='MultiVendor', blank=True, null=True) # Field name made lowercase.
lockformulary = models.IntegerField(db_column='LockFormulary', blank=True, null=True) # Field name made lowercase.
active = models.IntegerField(db_column='Active', blank=True, null=True) # Field name made lowercase.
autoadded = models.IntegerField(db_column='AutoAdded', blank=True, null=True) # Field name made lowercase.
allowpatientedit = models.IntegerField(db_column='AllowPatientEdit', blank=True, null=True) # Field name made lowercase.
displaymaxonorders = models.IntegerField(db_column='DisplayMaxOnOrders', blank=True, null=True) # Field name made lowercase.
class Meta:
managed = False
# db_table = 'custparent'
db_table = '`%s`.`custparent`' % pbd_name
def __str__(self):
return f'{str(self.custparent_id)} - {self.name}'
使用admin中的“关系”表创建对象时，一切正常。但是，每当我尝试使用DjangoRestFramework查看可浏览api中的User对象时。我收到此错误：django.db.utils.ProgrammingError：（1146，“表'med_portal.relation'不存在”）
Traceback (most recent call last):
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/core/handlers/base.py", line 117, in _get_response
response = middleware_method(request, callback, callback_args, callback_kwargs)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/debug_toolbar/middleware.py", line 85, in process_view
response = panel.process_view(request, view_func, view_args, view_kwargs)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/debug_toolbar/panels/profiling.py", line 160, in process_view
return self.profiler.runcall(view_func, *args, **view_kwargs)
File "/usr/lib/python3.6/cProfile.py", line 109, in runcall
return func(*args, **kw)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/viewsets.py", line 116, in view
return self.dispatch(request, *args, **kwargs)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/views.py", line 495, in dispatch
response = self.handle_exception(exc)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/views.py", line 455, in handle_exception
self.raise_uncaught_exception(exc)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/views.py", line 492, in dispatch
response = handler(request, *args, **kwargs)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/mixins.py", line 45, in list
return self.get_paginated_response(serializer.data)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/serializers.py", line 765, in data
ret = super(ListSerializer, self).data
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/serializers.py", line 262, in data
self._data = self.to_representation(self.instance)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in to_representation
self.child.to_representation(item) for item in iterable
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/serializers.py", line 683, in <listcomp>
self.child.to_representation(item) for item in iterable
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/serializers.py", line 527, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/rest_framework/relations.py", line 542, in to_representation
for value in iterable
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/models/query.py", line 268, in __iter__
self._fetch_all()
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/models/query.py", line 1186, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/models/query.py", line 54, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1065, in execute_sql
cursor.execute(sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/debug_toolbar/panels/sql/tracking.py", line 186, in execute
return self._record(self.cursor.execute, sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/debug_toolbar/panels/sql/tracking.py", line 124, in _record
return method(sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/utils.py", line 100, in execute
return super().execute(sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/django/db/backends/mysql/base.py", line 71, in execute
return self.cursor.execute(query, args)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/cursors.py", line 250, in execute
self.errorhandler(self, exc, value)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/connections.py", line 50, in defaulterrorhandler
raise errorvalue
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/cursors.py", line 247, in execute
res = self._query(query)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/cursors.py", line 411, in _query
rowcount = self._do_query(q)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/cursors.py", line 374, in _do_query
db.query(q)
File "/home/iclark/.local/share/virtualenvs/backend-2BnCgv4_/lib/python3.6/site-packages/MySQLdb/connections.py", line 277, in query
_mysql.connection.query(self, query)
django.db.utils.ProgrammingError: (1146, "Table 'med_portal.relation' doesn't exist")
答案 0 :(得分：0)
让我们假设您具有这些过于简化的结构：
app1.models
from django.db import models
class A(models.Model):
z = models.TextField()
app2.models
from django.db import models
class B(models.Model):
aref = models.ForeignKey(to='app1.A', on_delete=models.CASCADE)
app1.app1_router
class MyAppRouter:
def db_for_read(self, model, **hints):
if model._meta.app_label in ('app1', 'test'):
return 'app1_db'
return 'default'
def db_for_write(self, model, **hints):
if model._meta.app_label in ('app1', 'test'):
return 'app1_db'
return None
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label in ('app1', 'test') or obj2._meta.app_label in ('app1', 'test'):
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
if app_label in ('app1', 'test'):
return db == 'app1_db'
return None
具有以下数据库设置：
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
},
'app1_db': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'app1.sqlite3'),
}
}
DATABASE_ROUTERS = ["app1.app1_router.MyAppRouter",]
现在显然我们有两个数据库
显然，我们有一个aref = ForeignKey从app2.B（位于default数据库中）到app1.A（位于app1_db数据库中）。
我们显然会将数据库迁移为：
./manage.py migrate
./manage.py migrate --database=app1_db
涵盖两个数据库。
现在让我们假设要创建两个对象并将这些模型链接在一起：
a1 = A.objects.create()
b1 = B.objects.create(aref=a1)
将发生的事情是，a1实例将很容易创建，因为我们的MyRouter路由器将处理数据库写操作，并将SQL INSERT定向到app1_db期望，但是问题出在我们尝试编写B实例时，尤其是当我们尝试链接到app1_a中不存在的default模型时数据库（由于aref=a1而发生）。
当您尝试通过rest_framework访问它时，我猜测会发生什么。
问题是Django一次只能在一个数据库上运行，就我而言，有两种选择：
ForeignKey实现this implementation