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FilePathField instances are created in your database as varchar columns with a default max length of characters. A floating-point number represented in Python by a float instance. FloatField vs. The FloatField class is sometimes mixed up with the DecimalField class.
Although they both represent real numbers, they represent those numbers differently. Inherits all attributes and methods from FileField , but also validates that the uploaded object is a valid image. In addition to the special attributes that are available for FileField , an ImageField also has height and width attributes. To facilitate querying on those attributes, ImageField has two extra optional arguments:. Name of a model field which will be auto-populated with the height of the image each time the model instance is saved.
Name of a model field which will be auto-populated with the width of the image each time the model instance is saved. Requires the Pillow library. ImageField instances are created in your database as varchar columns with a default max length of characters.
An integer. Values from to are safe in all databases supported by Django.
It uses MinValueValidator and MaxValueValidator to validate the input based on the values that the default database supports. An IPv4 or IPv6 address, in string format e. For example, would be normalized to , and ::ffff:0a0a:0a0a to ::ffff All characters are converted to lowercase. Limits valid inputs to the specified protocol. Accepted values are 'both' default , 'IPv4' or 'IPv6'. Matching is case insensitive. Unpacks IPv4 mapped addresses like ::ffff If this option is enabled that address would be unpacked to Default is disabled.
Can only be used when protocol is set to 'both'. If you allow for blank values, you have to allow for null values since blank values are stored as null. Like an IntegerField , but must be either positive or zero 0.
Values from 0 to are safe in all databases supported by Django. The value 0 is accepted for backward compatibility reasons. Like a PositiveIntegerField , but only allows values under a certain database-dependent point. Slug is a newspaper term. A slug is a short label for something, containing only letters, numbers, underscores or hyphens. Implies setting Field.
It is often useful to automatically prepopulate a SlugField based on the value of some other value. Defaults to False. Like an IntegerField , but only allows values under a certain database-dependent point. A large text field.
The default form widget for this field is a Textarea. However it is not enforced at the model or database level. Use a CharField for that. A time, represented in Python by a datetime.
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Note that a callable with the parentheses omitted is passed to default , not an instance of UUID. A many-to-one relationship. To create a recursive relationship — an object that has a many-to-one relationship with itself — use models. If you need to create a relationship on a model that has not yet been defined, you can use the name of the model, rather than the model object itself:.
To refer to models defined in another application, you can explicitly specify a model with the full application label. This sort of reference, called a lazy relationship, can be useful when resolving circular import dependencies between two applications. A database index is automatically created on the ForeignKey.
You may want to avoid the overhead of an index if you are creating a foreign key for consistency rather than joins, or if you will be creating an alternative index like a partial or multiple column index. ForeignKey accepts other arguments that define the details of how the relation works.
For example, if you have a nullable ForeignKey and you want it to be set null when the referenced object is deleted:. Support for database-level cascade options may be implemented later. Cascade deletes. Prevent deletion of the referenced object by raising ProtectedError , a subclass of django. Set the ForeignKey null; this is only possible if null is True.
Set the ForeignKey to its default value; a default for the ForeignKey must be set. Set the ForeignKey to the value passed to SET , or if a callable is passed in, the result of calling it. In most cases, passing a callable will be necessary to avoid executing queries at the time your models. Take no action. Sets a limit to the available choices for this field when this field is rendered using a ModelForm or the admin by default, all objects in the queryset are available to choose. Either a dictionary, a Q object, or a callable returning a dictionary or Q object can be used.
This may be helpful in the Django admin. The callable form can be helpful, for instance, when used in conjunction with the Python datetime module to limit selections by date range. It may also be invoked when a model is validated, for example by management commands or the admin.
The admin constructs querysets to validate its form inputs in various edge cases multiple times, so there is a possibility your callable may be invoked several times. The name to use for the relation from the related object back to this one. See the related objects documentation for a full explanation and example. Note that you must set this value when defining relations on abstract models ; and when you do so some special syntax is available.
The name to use for the reverse filter name from the target model. The field on the related object that the relation is to. By default, Django uses the primary key of the related object. Controls whether or not a constraint should be created in the database for this foreign key. That said, here are some scenarios where you might want to do this:. If it is True - the default - then if the ForeignKey is pointing at a model which matches the current value of settings.
You only want to override this to be False if you are sure your model should always point towards the swapped-in model - for example, if it is a profile model designed specifically for your custom user model. If in doubt, leave it to its default of True. A many-to-many relationship. Requires a positional argument: the class to which the model is related, which works exactly the same as it does for ForeignKey , including recursive and lazy relationships. Behind the scenes, Django creates an intermediary join table to represent the many-to-many relationship.
By default, this table name is generated using the name of the many-to-many field and the name of the table for the model that contains it. ManyToManyField accepts an extra set of arguments — all optional — that control how the relationship functions. Same as ForeignKey. Instead, the ManyToManyField is assumed to be symmetrical — that is, if I am your friend, then you are my friend. If you do not want symmetry in many-to-many relationships with self , set symmetrical to False. This will force Django to add the descriptor for the reverse relationship, allowing ManyToManyField relationships to be non-symmetrical.
Django will automatically generate a table to manage many-to-many relationships. However, if you want to manually specify the intermediary table, you can use the through option to specify the Django model that represents the intermediate table that you want to use.
The most common use for this option is when you want to associate extra data with a many-to-many relationship. It has three fields to link the models. If the ManyToManyField points from and to the same model, the following fields are generated:. This class can be used to query associated records for a given model instance like a normal model.
Only used when a custom intermediary model is specified. Django will normally determine which fields of the intermediary model to use in order to establish a many-to-many relationship automatically. However, consider the following models:. This also applies to recursive relationships when an intermediary model is used and there are more than two foreign keys to the model, or you want to explicitly specify which two Django should use.
The name of the table to create for storing the many-to-many data. If this is not provided, Django will assume a default name based upon the names of: the table for the model defining the relationship and the name of the field itself.
Controls whether or not constraints should be created in the database for the foreign keys in the intermediary table. If it is True - the default - then if the ManyToManyField is pointing at a model which matches the current value of settings. ManyToManyField does not support validators. A one-to-one relationship. One positional argument is required: the class to which the model will be related. This works exactly the same as it does for ForeignKey , including all the options regarding recursive and lazy relationships.
When True and used in a model which inherits from another concrete model , indicates that this field should be used as the link back to the parent class, rather than the extra OneToOneField which would normally be implicitly created by subclassing. Field is an abstract class that represents a database table column. Acceptance is based on need and commitment to the camp. March , Free and open to everyone. Limited space is available, you must apply 18 years and older years with an adult in attendance.
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