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Django ORM

Information Technology > Database management system

Description

Django ORM (Object-Relational Mapping) is a powerful tool that allows developers to interact with their database like as they would with SQL. In other words, it's a way to create, retrieve, update, and delete records in your database, using Python code instead of writing SQL queries. The beauty of Django ORM is that it's database agnostic, meaning you can switch between different database types with minimal code changes. It also supports advanced features such as migrations (for changing your database schema without losing data), aggregation for performing operations on a group of rows, and transactions for ensuring data consistency.

Stack

Django

Expected Behaviors

✎
LEVEL 1

Fundamental Awareness

At this level, individuals are expected to have a basic understanding of what Django ORM is and its purpose. They should be familiar with the fundamental concepts of Django ORM such as models, fields, and relationships.

🌱
LEVEL 2

Novice

Novices should be able to create simple models in Django ORM and perform basic CRUD operations. They should understand how to use Django ORM for database abstraction and create simple queries. They should also grasp the concept of migrations in Django ORM.

🌍
LEVEL 3

Intermediate

Intermediate users should be capable of creating complex models with relationships and performing complex queries using Django ORM. They should understand and use advanced field types and manage database schema changes using migrations. They should also be able to use Django ORM to interact with multiple databases.

⭐
LEVEL 4

Advanced

Advanced users are expected to optimize Django ORM queries for performance and use aggregation and annotation features. They should be able to implement custom model methods and managers, understand and use transactions, and use signals for event-driven programming.

🏆
LEVEL 5

Expert

Experts should have a deep understanding of Django ORM's internal workings and be able to customize it to suit specific needs. They should be proficient in using advanced features like prefetch_related and select_related, and be able to optimize Django ORM for large scale applications. They should also be able to troubleshoot and resolve complex issues related to Django ORM.

Micro Skills

✎
LEVEL 1

Fundamental Awareness

Knowing the full form of ORM
Understanding the basic definition of Django ORM
Recognizing Django ORM as a part of Django framework
Understanding that Django ORM allows interaction with database like querying, adding records etc.
Knowing that Django ORM provides an abstraction over SQL
Recognizing that Django ORM helps in reducing boilerplate code
Understanding the concept of models in Django ORM
Knowing what fields in Django ORM are
Understanding the concept of relationships in Django ORM like ForeignKey, ManyToManyField etc.
🌱
LEVEL 2

Novice

Understanding the concept of a model in Django ORM
Knowing how to define a model class
Defining fields in a model
Understanding different types of fields available in Django ORM
Knowing how to create a new instance of a model
Understanding what CRUD operations are
Knowing how to create (insert) data using Django ORM
Knowing how to read (select) data using Django ORM
Knowing how to update data using Django ORM
Knowing how to delete data using Django ORM
Understanding the concept of database abstraction
Knowing how Django ORM provides database abstraction
Understanding how to use Django ORM to interact with different types of databases
Understanding the concept of a query in Django ORM
Knowing how to create a simple query to retrieve data
Understanding how to filter and order data in a query
Knowing how to use the Django ORM QuerySet API for querying
Understanding what a migration is
Knowing why migrations are necessary
Understanding how to create and apply a migration using Django ORM
Knowing how to rollback a migration
🌍
LEVEL 3

Intermediate

Understanding the different types of relationships in Django ORM (OneToOne, ForeignKey, ManyToMany)
Defining related_name and related_query_name in relationships
Using through and through_fields for extra fields on many-to-many relationships
Implementing self-referential relationships
Using Q objects for complex lookups
Using F expressions to refer to model field values directly in the database
Applying conditional expressions in queries
Making use of Subquery and OuterRef for nested queries
Working with FileField and ImageField for file uploads
Using DateTimeField and DateField effectively
Implementing choices in CharField
Understanding and using GenericForeignKey fields
Creating and applying migrations
Rolling back migrations
Creating data migrations
Resolving migration conflicts
Setting up multiple databases in settings.py
Routing database operations to specific databases
Performing cross-database relations
Understanding limitations of multiple databases in Django ORM
⭐
LEVEL 4

Advanced

Understanding the concept of query optimization
Identifying slow queries using Django's database logging
Using Django Debug Toolbar to analyze queries
Implementing select_related and prefetch_related for query optimization
Understanding and implementing database indexing in Django ORM
Understanding the difference between aggregation and annotation
Implementing simple aggregations like Count, Sum, Avg
Implementing complex aggregations using annotate
Using F expressions in annotations
Grouping query results using values and values_list
Understanding the purpose of model methods and managers
Creating custom model methods
Creating custom managers and manager methods
Using managers for table-level operations
Using model methods for row-level operations
Understanding the concept of database transactions
Using Django ORM's atomic decorator for transaction management
Implementing savepoints in transactions
Handling exceptions within transactions
Understanding and managing transaction isolation levels
Understanding the concept of signals in Django
Implementing pre_save and post_save signals
Implementing pre_delete and post_delete signals
Understanding and handling signal chaining
Creating and using custom signals
🏆
LEVEL 5

Expert

Understanding the role of models in Django ORM
Understanding the role of managers in Django ORM
Understanding the role of QuerySets in Django ORM
Understanding the purpose of custom fields
Implementing and using custom fields
Understanding the purpose of custom managers
Implementing and using custom managers
Understanding how to override existing methods
Implementing and using overridden methods
Understanding when to use custom SQL
Writing and executing custom SQL

Skill Overview

  • Expert3 years experience
  • Micro-skills86
  • Roles requiring skill0

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