I would like to use two databases in my application:
- local database
- external database
in the first one I want to save all django tables , e.g auth_group
To do this I tried to use router class, but unsuccessfully - it doesn't work. Below you can find my code
Django 1.11
setings file:
DATABASE_ROUTERS = ['mainApp.models.DefaultDBRouter','subfolder.newApp.models.testDBRouter',]
models.py - main app - I want to use default DB for this model
from __future__ import unicode_literals
from django.db import models
class list_a( models.Model ):
region = models.CharField(max_length=50, verbose_name="Region")
country = models.CharField(max_length=50, verbose_name="Country")
def __unicode__(self):
return str( self.country )
class DefaultDBRouter(object):
"""
A router to control all database operations on models in the
auth application.
"""
def db_for_read(self, model, **hints):
"""
Reads go to a default.
"""
return "default"
def db_for_write(self, model, **hints):
"""
Writes always go to default.
"""
return 'default'
def allow_relation(self, obj1, obj2, **hints):
"""
Relations between objects are allowed if both objects are
in the default.
"""
db_list = ('default')
if obj1._state.db in db_list and obj2._state.db in db_list:
return True
return None
def allow_migrate(self, db, app_label, model=None, **hints):
"""
All non-micro-management models end up in this pool.
"""
return True
models.py - test app - I want to use second db for this model
class testTable( models.Model ):
date = models.DateField(verbose_name="Date")
number_name = models.CharField(max_length=50, verbose_name="Number name")
def __unicode__(self):
return str( self.number_name )
ELIGIBLE_APPS = [
'subfolder.newApp',
]
class testDBRouter(object):
def db_for_read(self, model, **hints):
print model._meta.app_label
if model._meta.app_label in ELIGIBLE_APPS:
return 'secondDB'
return None
def db_for_write(self, model, **hints):
if model._meta.app_label in ELIGIBLE_APPS:
return 'secondDB'
return None
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label in ELIGIBLE_APPS or \
obj2._meta.app_label in ELIGIBLE_APPS:
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
if app_label in ELIGIBLE_APPS:
return db == 'secondDB'
return None
And if I execute the following command:
python2.7 manage.py migrate --database=secondDB
Then django creates all tables from both models files and standard django tables inside that database ( should create only one )
