Question: Multiple Schema migrates
WilliamHH opened this issue · comments
Thank you for this work ... I'm testing in an app at the moment with good success so far.
QUESTION: Is it possible to do multi schema updates at the same time for POSTGRESQL... e.g. TENANT_NAME=*?
Hey there, thanks for sharing your feedback.
Is it possible to do multi schema updates at the same time for POSTGRESQL... e.g. TENANT_NAME=*?
No, there's no support for wildcard / "all tenant" operations. (The library isn't aware of how many tenants you have.) You would have to script this.
Approx one year later and now working [a hobby project] to find a method for multi-schema migrations. With step assistance from various forums, I think the following script may assist db-multitenant users. I've done some basic testing but am not yet fully confident given my limited experience. Your trained eye will be appreciated.
commands/all_tenant_migrate.py
"""
A command to assist db-multitenant in mass migration of model changes.
Not tested to use when initially setting up a fresh Schema.
COMMAND : python manage.py all_tenant_migrate
"""
from django.conf import settings
from django.core.management.base import BaseCommand
from subprocess import Popen
from sys import stdout, stdin, stderr
import os
import psycopg2
import signal
import time
class Command(BaseCommand):
help = 'Run single makemigrations and migrate in sequence for all tenant schemas'
def handle(self, *args, **kwargs):
# get all tenant names from schema list in database
conn = psycopg2.connect(
host=settings.GET_SECRET('DATABASE_HOST'),
database=settings.GET_SECRET('DATABASE_NAME'),
user=settings.GET_SECRET('DATABASE_USER'),
password=settings.GET_SECRET('DB_USER_PASSWORD'),)
cursor = conn.cursor()
cursor.execute("SELECT schema_name FROM information_schema.schemata WHERE schema_name NOT IN ('pg_toast','pg_catalog','information_schema', 'public');")
tenants =[]
tenants = cursor.fetchall() #values_list('tenant_name',flat=True)
tenant_list = [list[0] for list in tenants]
conn.commit()
cursor.close()
conn.close()
first_schema = tenant_list[0] # set a schema to run the leading 'makemigrations'
commands = [f'TENANT_NAME={first_schema} python manage.py makemigrations ',]
for schema in tenant_list:
commands += f'TENANT_NAME={schema} python manage.py migrate',
# OPTIONAL : commands.append('python manage.py runserver')
proc_list = []
for command in commands:
print("$ " + command)
proc = Popen(command, shell=True, stdin=stdin,
stdout=stdout, stderr=stderr)
proc_list.append(proc)
time.sleep(2)
for proc in proc_list:
os.kill(proc.pid, signal.SIGINT)