Django Framework: Models and URL Dispatcher

9 Questions

Uma classe Python que herda de django.db.models.Model

Representar uma relação muitos-para-um com outro modelo

Um registro em uma tabela de banco de dados

Mapear URLs para views

Uma expressão regular que define o formato de uma URL

Iterando sobre os padrões de URL para encontrar a view correspondente

Uma função que lida com requisições HTTP e retorna respostas HTTP

Para capturar valores da URL

Uma função que mapeia padrões de URL para views

Study Notes

Definition: In Django, a model represents a database table.
Key Features:
- Each model is a Python class that inherits from django.db.models.Model.
- Models define the structure of the database table.
- Models can have fields, which are instances of django.db.models.Field subclasses.
Types of Fields:
- CharField: A string field with a maximum length.
- IntegerField: A whole number field.
- DateTimeField: A date and time field.
- ForeignKey: A many-to-one relationship with another model.
Model Instances:
- Each instance of a model represents a single row in the database table.
- Instances have attributes that correspond to the fields defined in the model.

Definition: The URL Dispatcher is a system that maps URLs to views in Django.
Key Features:
- URL Patterns: Regular expressions that define the format of a URL.
- Views: Functions that handle HTTP requests and return HTTP responses.
- URL Resolvers: Functions that map URL patterns to views.
URL Pattern Syntax:
- Use parentheses to capture values from the URL.
- Use < and > to specify the type of value (e.g., <int:id>).
Example:

from django.urls import path
from . import views

urlpatterns = [
    path('books/<int:year>/', views.book_list),
]

How it Works:
1. A request is made to a URL.
2. Django iterates over the URL patterns in the order they are defined.
3. The first pattern that matches the URL is used to call the associated view.