{"id":6787,"date":"2023-10-19T08:38:32","date_gmt":"2023-10-19T08:38:32","guid":{"rendered":"https:\/\/djangostars.com\/blog\/?p=6787"},"modified":"2025-10-21T12:21:51","modified_gmt":"2025-10-21T12:21:51","slug":"django-models-best-practices","status":"publish","type":"post","link":"https:\/\/djangostars.com\/blog\/django-models-best-practices\/","title":{"rendered":"Working with Django Models in Python: Best Practices"},"content":{"rendered":"

The Django framework provides a versatile toolset for managing your code and data. However, there are many strategies you can follow to build more stable products. Following best practices, Django models can become more secure, maintainable, and scalable. That\u2019s no accident\u2014over the history of Django,<\/strong> its \u201cbatteries-included\u201d mindset established clear model conventions, strong defaults, and maintainable patterns these practices build on.<\/p>\n

As a backend engineer in Django Stars with a deep knowledge in custom django development<\/a>, I’ve accumulated a lot of knowledge about Django and Python. This article discusses some of the Django models management best practices that can help save you time and effort.<\/p>\n

Best Practices for Django Models<\/h2>\n

These are some Django models best practices, including everyday tips and advanced techniques that I use to manage them. They range from fine-tuning fields and simplifying queries to improving security for object relationships.<\/p>\n

Naming Django models in Python: best practices<\/h3>\n

Let\u2019s start with the correct Django models name conventions. Although simple, these are invaluable for maintaining your databases.
\n\"Naming<\/p>\n

Use singular nouns<\/h4>\n

A model should be named with a singular noun, representing a single entity. This makes understanding the relationship between models easier and avoids confusion.<\/p>\n

Favor short names<\/h4>\n

Long model names are difficult to remember and type. Opt for concise names: for instance, use Feedback<\/i> instead of CustomerFeedbackSurveyResponse<\/i>.<\/p>\n

Employ upper camel case<\/h4>\n

Django models follow Python-based Pascal case naming conventions, meaning each word in the name should start with a capital letter and contain no underscores.<\/p>\n

Avoid abbreviations<\/h4>\n

Abbreviations often introduce needless ambiguity. Instead of writing Addr<\/i>, use the complete term Address.<\/p>\n

Refrain from using reserved words<\/h4>\n

Always avoid terms that are reserved by Django or Python. Don\u2019t name models using terms like object<\/i>, class<\/i>, or get<\/i>.<\/p>\n

Align model and app name<\/h4>\n

Model names should be aligned with the application name without duplicating it. If the app name is Blog<\/i>, model names could include Post<\/i>, Comment<\/i>, and Tag<\/i>.<\/p>\n

Best practices for naming relationship fields<\/h3>\n

Careful naming of relationship fields (special Django models field types establishing connections between different data models) contributes to a cleaner and more maintainable Django codebase.<\/p>\n

Use plural naming for a ManyToManyField<\/h4>\n

A ManyToManyField<\/i> should include a plural noun that reflects the related model. For instance, the field name could be Categories<\/i> if a Product<\/i> model has a ManyToManyField<\/i> to a Category<\/i> model.<\/p>\n

Employ singular naming for a OneToOneField<\/h4>\n

A OneToOneField<\/i> represents a one-to-one relationship and should be named using a singular noun that reflects the related model.<\/p>\n

Stick to descriptive names<\/h4>\n

I always avoid vague or ambiguous names, as it helps prevent confusion when multiple relationship fields exist between the same models.<\/p>\n

Use lowercase with underscores<\/h4>\n

Always use lowercase letters and underscores for Django model fields names to prevent case sensitivity issues with database backends. For example, full_name<\/i> instead of FullName<\/i>.<\/p>\n

Be cautious with related_name<\/h4>\n

Avoid using the same name for a related_name<\/i> argument and a field within one class. On the other hand, having the same field name in different classes doesn’t affect the model.<\/p>\n

Best practices for using choices in Django models<\/h3>\n

Using the choices<\/i> arguments correctly improves data integrity in Django models. It creates a central repository of predefined values, enforces model validation, and helps avoid hardcoding the values in the views. You can also use choices to limit user input per value to prevent unwanted queries.
\n\"Best<\/p>\n

Limit fields to one predefined value<\/h4>\n

When composing a list of tuples, use choices<\/i> to define the valid values and human-readable names. This simple method minimizes the risk of inconsistent data entry.<\/p>\n

Use CharField and IntegerField<\/h4>\n

While choices<\/i> can be used with any field type, I prefer using CharField (string field storing text values) and IntegerField (numeric fields for integer values). Using choices with CharField can avoid using cryptic codes or abbreviations, while IntegerField helps avoid arbitrary numbers.<\/p>\n

Use Constants or Enums<\/h4>\n

Defining the values as Constants or Enums helps make choices<\/i> more maintainable and easily updatable. It also helps avoid hardcoding choice values throughout the codebase, which leads to many headaches and errors. For example, instead of using (‘A’, ‘Available’)<\/i>, use (AVAILABLE, ‘Available’),<\/i> where AVAILABLE<\/i> is a defined constant.<\/p>\n

Ensure data integrity with database-level methods<\/h4>\n

Choices<\/i> don’t enforce constraints at the database level. While choices<\/i> validate and display field values in forms and admin interfaces, their use can cause unexpected behavior. It\u2019s better to ensure data integrity via other database-level methods like constraints<\/i>, triggers<\/i>, and custom validators<\/i>.<\/p>\n

Remove choices<\/i> carefully during database migration<\/h4>\n

The choices<\/i> argument doesn’t alter the database schema, meaning you don’t need to perform database migrations when choices are added or removed. However, removal might cause errors in existing records that use old or removed choices. The solution might be to write a script that updates all records or deletes ones that are no longer relevant.<\/p>\n

Best practices of Django models blank vs null values<\/h3>\n

In new database models, both null and blank are set to False. These two values are easy to confuse, but they\u2019re quite different.<\/p>\n

Store null values<\/h4>\n

In Django, the null <\/i>argument indicates whether a database column can store null <\/i>values. Setting null=False<\/i> means the price column cannot have null <\/i>values in the database. Meanwhile, the default value of null<\/i> is False<\/i> for most field types, except for the ForeignKey<\/i>, OneToOneField<\/i>, and ManyToManyField<\/i>.<\/p>\n

Use blank for empty fields in forms<\/h4>\n

The blank <\/i>argument is a Boolean validation-related value determining if the field can be empty. For example, if a Product<\/i> model has a field named description that is a TextField, setting blank=True<\/i> means that the description field can be left blank or empty in forms, indicating that the product has no description.<\/p>\n

Stick to empty strings<\/h4>\n

A common misconception is that setting null=True<\/i> on a CharField or TextField would allow no data. However, both null<\/i> and an empty <\/i>string would signify no data<\/i>, creating needless ambiguity. It\u2019s better to default to an empty string for these field types.<\/p>\n

Using Meta class in Django models: best practices<\/h3>\n

The Meta class is a nested class inside a model class that provides metadata and configuration options for the model.
\n\"Using<\/p>\n

Prefer common use attributes<\/h4>\n

I explicitly name the model and the fields. This can be done with verbose_name<\/i> and verbose_name_plural<\/i> \u2014 human-readable names for the model used in the admin interface and error messages. Another way is to use app_label<\/i> to specify the app’s name for migrations.<\/p>\n

Use default sorting of objects<\/h4>\n

Setting the ordering<\/i> attribute in your model\u2019s Meta class helps organize how objects will be listed by default. For instance, ordering = (‘name’, ‘-price’)<\/i> sorts objects by name in ascending order and by price in descending order. However, be cautious \u2014 sorting can impact performance. If you need it, consider adding an index for quicker retrievals.<\/p>\n

Avoid errors with custom table names<\/h4>\n

Using the db_table<\/i> attribute lets you define the name of the database table for your model, like db_table = ‘shop_product’<\/i>. This is a handy way to avoid table name clashes in your database.<\/p>\n

Use unique_together for multi-column constraints<\/h4>\n

Employing UniqueConstraint<\/i> instead of the older unique_together<\/i> helps enforce uniqueness in multi-column fields. This ensures there can’t be two instances of the model with identical values. It works at the database level, adding an extra layer of integrity.<\/p>\n

Boost query performance with index_together<\/h4>\n

The indexes<\/i> option can speed up queries. By using indexes <\/i>instead of deprecated index_together<\/i>, you can improve query performance for specific combinations of fields (like names, categories, and statuses).<\/p>\n

Use constraints<\/i> to define database constraints<\/h4>\n

With the constraints<\/i> attribute, you can specify custom database-level constraints using models that inherit from models.BaseConstraint<\/i>. For example, a check constraint can be applied to the price field to ensure it’s always greater than zero.<\/p>\n

Practices and considerations for indexing in Django<\/h3>\n

Indexes improve read performance, and within the Django orm<\/a> you apply this by indexing frequently filtered\/ordered\/joined fields, using Meta.indexes<\/code>, and validating gains with QuerySet.explain()<\/code> as data scales.<\/p>\n

Enforce consistency with unique fields<\/h4>\n

Setting unique=True<\/i> on a model field ensures its value will be one-of-a-kind within the database table. This indexing is handled automatically by Django. For instance, if your Product model features a SKU<\/i> field, making it unique prevents duplicate SKUs.<\/p>\n

Use single-column indexing with Db_index<\/h4>\n

I use db_index=True<\/i> for often queried fields with a wide range of unique values. For example, applying it to a Product model will speed up the queries that filter by this field.<\/p>\n

Things to consider for indexing<\/h4>\n