decorators are a tool that allow you to easily create models that will be attached to an object or group of objects.
These decorators will allow you the ability to add a few extra features such as the ability for your models to have a custom theme, a custom class, and even add a custom form.
For example, a model may have a class that has a special attribute that is used to determine the text displayed by the model.
In the case of the whales model, this special attribute is the title.
For this to work, the whales title would need to be a string.
The decorator also provides a way to customize the text that appears on the title field.
By using the decorator , you can create the title as a custom string and display it on the model itself, without having to modify the model object itself.
Using the decorators decorator method will create a model object and attach it to an existing model.
For a simple model like a blog, you can use the decorate decorator.
In this example, we’ll create a blog post model and then attach it with a decorator that creates a blog model.
class Blog post: name = ‘My Blog’ title = ‘How to Build a Model Decorator for Model Objects’ def decorate(self,title): # The decorators method creates a model and attaches it to the blog model = Blog.objects.get(‘myModel’).decorate(title=’My Blog’) return model blog = Blog(name=’My New Blog’) class Blogpost: # The blog post decorator adds the title of the blog post as the title for the blog.
# The title is also displayed as a string and used as the key for the model class MyBlogPost: def __init__(self): self.title = title def decorator(self ,title): self .title = decorator(‘myTitle’, title=’My title’) return blog class Blog(post): name = Blog post = Blogpost() # Adding the title to the post title = decorate(‘mytitle’, title) blog.title() # Displaying the title on the blog posts.append(title) # Display the title in the title bar, so that the blog can easily find it def show_title(posts): for post in posts: if post.title == ‘My New blog’: posts.remove(post.title) return posts The decorating of the post class allows us to display a title on posts.
In addition to adding the title, the decorating decorator allows us the ability in addition to changing the title that the posts is displayed with.
In our example, the title is displayed in the post, but the post is not displayed with the title change.
By simply changing the text on the posts title, we can change the behavior of the posts.
For instance, if we change the title from ‘My blog’, the posts now have a different title that displays ‘How To Build a model Decorators for Model Models’.
The decoration decorator is one of the most powerful decorators in Django, so make sure to learn about it.
To see all of the decorater functions, check out the decoration documentation.
The code example below demonstrates how to create a decorators class for an existing Django model, with the ability, for the title and title fields to be added to the model, as well as displaying the title within the post itself.
The post decorators.py code example is available in the examples directory.
This example will work with models that have a single post title and the title has been set to the default ‘How You Built It’ by default.
This will create the following models: models.post models.comment models.text models.comments.title models.models.models modelmodels.post modelmodels posts.comment posts.text comments.title posts.comments models.modelmodels models.posts models.blog posts.posts posts.title The decorate function will create three models, posts.model, posts, and posts.models .
Each of these models is a subclass of Blog that extends models and has the following attributes: title : The title of each post model.
This attribute is used by the posts decorator to set the title used in the blog title field of the model instance.