ImageField — this is a ** options )
ImageField has the following optional arguments:
This attribute provides a way to set the download directory and filename, and can be set in two ways. In both cases, the value is passed to the Storage method .save () . If you supply a string value, it can contain the formatting strftime () , which will be replaced by the date / time of the file upload (so that the uploaded files do not fill this directory). For example:
If you are using FileSystemStorage By default, a string value will be added to your
MEDIA_ROOT path to form the location on the local filesystem where the downloaded files will be stored. If you are using another repository, check the documentation for that repository to see how it handles
upload_to can also be callable by, for example, a function. This will be called to get the download path including the filename. This callable must take two arguments and return a Unix-style path (with a forward slash) to pass to the storage system. Two arguments:
|instance||An instance of the model where the ImageField is defined. More specifically, this is a particular instance where the current file is being attached.|
|filename||The filename that was originally given to the file. This may or may not be taken into account when determining the final destination path|
For example: p >
The name of the model field, which will be automatically filled with the image height each time the model is saved.
Name of the model field that will be automatically captured Fill in the width of the image each time the model is saved.
ImageField illustration using an example. Consider a project named
pythonengineering that has an application named
Refer to the following articles to check how to create a project and an app in Django.
Enter the following code into the
models.py file of the geeks application.
Now when we run the
makemigrations command from the terminal,
Python manage.py makemigrations pre>
geeks directory < / code> a new folder named migrations will be created with a file named
Python manage.py migrate
geeks_field ImageField is generated when you run migrations in the project. This is a field to store valid image files.
ImageField is used to store valid image files in the database. Can any type of image file in ImageField. Let`s try to save the image in the model created above.
Python manage.py createsuperuserli >
Field parameters — they are arguments given to each field to apply some constraint or to convey a particular characteristic to a particular field. For example, adding the
null = True argument to the ImageField will allow it to store empty values for that table in a relational database.
Here are the field options and attributes that ImageField can use.
|Null||If True , Django will store empty values as NULL in the database. Default is False.|
|Blank||If True , the field is allowed to be blank ... Default is False.|
|Default||The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.|
|help_text||Extra “help” text to be displayed with the form widget. It`s useful for documentation even if your field isn`t used on a form.|
|Unique||If True, this field must be unique throughout the table.|
We live in an age of so-called Big Data. We hear terms like data scientist, and there is much talk about analytics and the mining of large amounts of corporate data for tidbits of business value. Ther...
The Apache Hadoop software library has come into it’s own. It is the basis for advanced distributed development for a host of companies, government institutions, and scientific research facilities. ...
Python: - The Bible - 3 Manuscripts in 1 book:
Professional-quality code does more than just run without bugs. It’s clean, readable, and easy to maintain. To step up from a capable Python coder to a professional developer, you need to learn indu...