在同一python代码中编辑models.py文件并将更改迁移到数据库

我希望为应用程序编辑models.py文件，然后用相同的python代码将更改迁移到数据库（postgreSQL）

在本应执行此操作的视图定义中，我执行以下操作：

openmodels.py

将新表的模型附加到现有模型

Close models.py

运行makemigrations

运行sqlmigrate

运行迁移

在步骤3之前，它工作正常。新表的模型正在添加到models.py，但“makemigrations”不接受添加到models.py的最新模型

实际上，它不是为迁移获取models.py的最新副本，而是使用调用视图之前存在的副本

是否有方法将最新的（附带所需模型）models.py文件用于迁移命令

#Here we are attempting to create a user's portfolio table as soon as his registration is complete
            
            #Step1: Adding schema to model.py
            
            modeladdscript = '\n\nclass '+ username + '(models.Model):'
            modeladdscript = modeladdscript + '''
stock_id = models.CharField(max_length = 20)
stock_name = models.CharField(max_length = 100)
qty = models.IntegerField(default = 0)
investment = models.FloatField()
hold = models.CharField(max_length = 50)'''
            
            #Step 2: Getting the location of models.py in fileloc

            fileloc ='portfolio\models.py' #Need to figure out how to get location of portfolio/models.py
            
            #Step 3: Opening models.py and appending the model add script

            with open(fileloc,"a") as f:
                f.write(modeladdscript)
            
            #Step 4: Closing models.py
            f.close()
            #Works absolutely fine till here

            # Make migrations
            call_command('makemigrations')  #This command is not taking the model that has been added above at the time of user creation.

            # Remove all the terminal colors, less parsing later.
            os.environ['DJANGO_COLORS'] = 'nocolor'

            # Capturing the list of applied and unapplied migrations 
            out = StringIO()
            call_command('showmigrations', stdout=out)

            # Clean up the line, and remove all applied migrations
            work = [line.strip() for line in out.getvalue().split('\n') if not line.startswith(' [X]')]
            # Keep looping until we run out of lines.
            while work:
                app_name = work.pop(0)
                while work and work[0].startswith('['):
                    migration_name = work.pop(0)[4:]
                    app_path = apps.get_app_config(app_name).module.__file__
                    # Print the whole path to the migration file that corresponds to this migration
                    print('--', os.path.abspath(os.path.join(app_path, '../migrations/', '{}.py'.format(migration_name))))
                    call_command('sqlmigrate', app_name, migration_name[:8])
            
            # Applying all pending migrations
            call_command('migrate')