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What is Django Model Manager | Django Tutorials

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What is Django Model Manager | Django Tutorials

What is Django Model Manager

As we are learning Django from beginner level to expert level, so in this article we have to discuss Django model manager, what is the manager in the model class, custom manager, etc with explanations and examples. You will be cleared everything and everything about the model manager if you read this lesson from start to end. To learn more, continue reading!

What is Django Model?

Model in Django is the class in which defines some properties and behavior for a specific entity. In fact, a model is a class that converts to a database table. A model class may contain multiple attributes having different types of data types as text type, date type, number type, URL type, Email type, Password type, etc. After creating a model we have to run the following command:

python manage.py makemigrations

It will create a migration file in which SQL coding will be generated for your model class, but the table will not be created in the database, if you want the above migration file is the OK, then you can run another command that will apply on SQL code to create a table in the database.

python manage.py migrate

You will see that table in the database with the name of your model class, now we want to go to our topic which is Django model manager, so continue to read!

What is Django Model Manager

As we interact with database tables to insert, retrieve, update or delete operations. Make interaction with the database is very important because all the data of an organization or a website is stored in the database. If we need to retrieve some data from a database or need to update or delete some record, we make a query using query set API, which sends a query to the database. How is this done in the Django framework?

Actually, there is an interface that receives our queries and sends them to the database for operations. That is the manager which directly interacts with the database, it takes our query and makes a relation between you and the database. All the model class has default manager which manages all types of operations on database tables.

You have listened to ‘objects’ when you are making queries. So ‘objects’ is the default manager for all model classes, but we can change it according to our requirements.

e.g Students.objects.all() is the simple query that retrieves all the student’s records from a database table. You can see that there is the word ‘objects’ which is the default manager, it makes an interface through which this query interacts with the database Students named table.

Custome Model Manager

As we are learning what is Django Manager, we have used the default manager while creating communication with the Database. But you are bound to use the same manager as mentioned by Django but you can use your own named manager, it will work like a default.

For that you have to use models.Manager() attribute in your model class. The value you give to models.Manager(), it will be your model manager for that model class in which you have used. For example:

from django.db import models

class Model_name(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30) 
    city = models.CharField(max_length=30)
    custom = models.Manager()
So, in the above model class, we changed the manager for the above model class only. For example, you want to communicate with a database. To retrieve all objects from the database using a custom model manager you can use as:
Model_name.custom.all()

Now! what you have to do?

As you have understood this article about “Django Model Manager”, now you must follow instructions as discussed in this article. In case of any issues or problems, don’t worry, you can discuss them with us.

On other hand, If you have any suggestions or knowledge about this article, you can share it with us, we will appreciate you!

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