Conteúdo do Curso

Django ORM Ninja: Advanced Techniques for Developers

1. Introduction to Django ORM

Introduction to the Course Introduction to the ORM Start a New Project Initialize a New Project

2. Models, datatypes, and fields

Defining The First Model Field Data Types Define Other Models Migrations Admin Interface

3. Queries

Create Query Retrieve Query Lazy Queries Ordering and Slicing Updating Deleting

4. Relations

Many-to-One ForeignKey Arguments One-to-One Many-to-Many

5. Complex Queries

Field Lookups Q and F Objects Aggregations Annotations Minimazing Database Hints

6. Advanced

Class Meta Constrains Transactions Basics User Model

Field Data Types

In this chapter, we will consider the most useful data types for fields, with other types described in the official documentation.

Field data type	Python type	Description
CharField	str	Text-based values
IntegerField	int	Positive and negative integer field
TextField	str	A large text field without any limitations in character number.
DecimalField	float (decimal)	It is a fixed-precision decimal number. More precise than just float numbers in Python. This field typically includes parameters like max_digits and decimal_places
DateField	date	A date, presented as datetime.date instance in Python
DateTimeField	datetime	A date and time, presented as datetime.datetime instance in Python
EmailField	str	String that checks that value is a valid email address.
ImageField	...	Validates that the uploaded object is a valid image.

The most common field options are:

max_length (it is the required argument for the CharField field);
null (if True, it will be possible to store empty values as NULL. Default is False);
blank (if True, the field is allowed to be blank. Default is False);
default (You can pass the default value for the field. For example, often used date_created = models.DateTimeField(default=datetime.utcnow()) the current time will be stored as a value);
primary_key (usually used for the id field);
unique (if True, this field must be unique throughout the table. Useful for nickname field, for example);
choices (the default form widget will be a select box instead of a standard text field and will limit choices).

Here is an example of how to use the choices field:

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 2. Capítulo 2

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Conteúdo do Curso

Django ORM Ninja: Advanced Techniques for Developers

1. Introduction to Django ORM

Introduction to the Course Introduction to the ORM Start a New Project Initialize a New Project

2. Models, datatypes, and fields

Defining The First Model Field Data Types Define Other Models Migrations Admin Interface

3. Queries

Create Query Retrieve Query Lazy Queries Ordering and Slicing Updating Deleting

4. Relations

Many-to-One ForeignKey Arguments One-to-One Many-to-Many

5. Complex Queries

Field Lookups Q and F Objects Aggregations Annotations Minimazing Database Hints

6. Advanced

Class Meta Constrains Transactions Basics User Model

Field Data Types

In this chapter, we will consider the most useful data types for fields, with other types described in the official documentation.

Field data type	Python type	Description
CharField	str	Text-based values
IntegerField	int	Positive and negative integer field
TextField	str	A large text field without any limitations in character number.
DecimalField	float (decimal)	It is a fixed-precision decimal number. More precise than just float numbers in Python. This field typically includes parameters like max_digits and decimal_places
DateField	date	A date, presented as datetime.date instance in Python
DateTimeField	datetime	A date and time, presented as datetime.datetime instance in Python
EmailField	str	String that checks that value is a valid email address.
ImageField	...	Validates that the uploaded object is a valid image.

The most common field options are:

max_length (it is the required argument for the CharField field);
null (if True, it will be possible to store empty values as NULL. Default is False);
blank (if True, the field is allowed to be blank. Default is False);
default (You can pass the default value for the field. For example, often used date_created = models.DateTimeField(default=datetime.utcnow()) the current time will be stored as a value);
primary_key (usually used for the id field);
unique (if True, this field must be unique throughout the table. Useful for nickname field, for example);
choices (the default form widget will be a select box instead of a standard text field and will limit choices).

Here is an example of how to use the choices field:

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 2. Capítulo 2

Django ORM Ninja: Advanced Techniques for Developers

Field Data Types

1. Which field data type is best for storing a large text without limitations on character number?

2. Which of the following is a required argument for CharField?

3. What does the 'primary_key' option in a Django model field signify?

4. The choices option in a Django model field:

Django ORM Ninja: Advanced Techniques for Developers

Field Data Types

1. Which field data type is best for storing a large text without limitations on character number?

2. Which of the following is a required argument for CharField?

3. What does the 'primary_key' option in a Django model field signify?

4. The choices option in a Django model field: